SUMMARY: February TC Summary

From: Gary Padgett (garyp@ALAWEB.COM)
Date: Tue Jun 10 2008 - 11:20:46 EDT


 

                   MONTHLY GLOBAL TROPICAL CYCLONE SUMMARY

 

                                FEBRUARY, 2008

 

  (For general comments about the nature of these summaries, as well as

  information on how to download the tabular cyclone track files, see

  the Author's Note at the end of this summary.)

 

  *************************************************************************

 

                             FEBRUARY HIGHLIGHTS

 

   --> Intense tropical cyclone makes destructive strike in Madagascar

   --> Weakening cyclone makes landfall in Western Australia

 

  *************************************************************************

 

                     WIKIPEDIA TROPICAL CYCLONE REPORTS

 

     Short reports with satellite pictures and small-scale maps for all

  tropical cyclones may be found at the following links:

 

  http://en.wikipedia.org/wiki/2008_Atlantic_hurricane_season>

 

  http://en.wikipedia.org/wiki/2008_Pacific_hurricane_season>

 

  http://en.wikipedia.org/wiki/2008_Pacific_typhoon_season>

 

  http://en.wikipedia.org/wiki/2008_North_Indian_cyclone_season>

 

 
http://en.wikipedia.org/wiki/2007-08_Southern_Hemisphere_tropical_cyclone_se
ason>

 

  For some storms more detailed reports have been prepared. In those cases

  I will include the specific links in the reports for the applicable

  tropical cyclones.

 

  *************************************************************************

 

                    !!!!!!!!!! EXTRA FEATURE !!!!!!!!!!

 

                        2008 TROPICAL CYCLONE NAMES

 

           TROPICAL CYCLONE NAMES for the NORTHWEST PACIFIC BASIN

 

     Beginning in 2000 tropical storms and typhoons forming in the North

  Pacific west of the Dateline are assigned names by JMA taken from a

  new list of Asian names contributed by fourteen nations and territories

  from the western Pacific and eastern Asia. Names are not allocated

  in alphabetical order and the majority are not personal names--instead

  names of animals, plants, fictional characters, descriptive adjectives,

  places--even foods--are utilized. The entire list consists of 140

  names and all names will be used before any are repeated. The last

  name assigned in 2007 was Hagibis in November.

 

     The next 36 names on the list are (** indicates name has already

  been assigned in 2008):

 

       Neoguri ** Phanfone Maysak Molave

       Rammasun ** Vongfong Haishen Goni

       Matmo ** Nuri Noul Morakot

       Halong ** Sinlaku Dolphin Etau

       Nakri ** Hagupit Kujira Vamco

       Fengshen Jangmi Chan-hom Krovanh

       Kalmaegi Mekkhala Linfa Dujuan

       Fung-wong Higos Nangka Mujigae

       Kammuri Bavi Soudelor Choi-wan

 

     Since 1963 PAGASA has independently named tropical cyclones forming

  in the Philippines' AOR--from 115E to 135E and from 5N to 25N (except

  for a portion of the northwestern corner of the above region). Even

  though the Philippines contributed ten names to the international list

  of typhoon names, PAGASA still continues to assign their own names for

  local use within the Philippines. It is felt that familiar names are

  more easily remembered in the rural areas and that having a PAGASA-

  assigned name helps to underscore the fact that the cyclone is within

  PAGASA's AOR and potentially a threat to the Philippines. Another

  consideration may be PAGASA's desire to assign a name when a system is

  first classified as a tropical depression. Since tropical and/or

  monsoon depressions can bring very heavy rainfall to the nation which

  often results in disastrous flooding, the weather service feels that

  assigning a name helps to enhance public attention given to a system.

 

     Beginning with 2001 PAGASA began using new sets of cyclone names.

  These do not all end in "ng" as did the older names. Four sets of 25

  names will be rotated annually; thus, the set for 2008 will be re-used

  in 2012. In case more than 25 systems are named in one season, an

  auxiliary set will be used. PAGASA names for 2008 are (** indicates

  name has already been assigned in 2008):

 

           Ambo ** Julian Rolly

           Butchoy ** Karen Siony

           Cosme ** Lawin Tonyo

           Dindo ** Marce Ulysses

           Enteng ** Nina Vicky

           Frank Ofel Warren

           Gener Pablo Yoyong

           Helen Quinta Zosimo

           Igme

 

     In the unlikely event that the list is exhausted, the following

  names would be allocated as needed: Alakdan, Baldo, Clara, Dencio,

  Estong, Felipe, Gardo, Heling, Ismael, and Julio.

 

 

                     NORTH INDIAN OCEAN CYCLONE NAMES

 

     After several years of planning and working out implementation

  details, the RSMC for the North Indian Ocean basin--the Indian

  Meteorological Department--began naming tropical cyclones in that

  region on an experimental basis in the autumn of 2004.

 

     The procedure for allocating names is similar to that used in the

  Northwest Pacific basin. All the member nations--eight in this case--

  submitted eight names each. The 64 names were arranged in eight

  columns of eight names, ordered by the contributing nations in alpha-

  betical order, just as is done in the Northwest Pacific. Potential

  cyclonic storms for 2008 include (** indicates name has already been

  assigned):

  

           Nargis ** Bijli Laila

           Abe Aila Bandu

           Khai Muk Phyan Phet

           Nisha Ward Giri

 

 

               EXTRA FEATURE - INDEX TO EXTRA FEATURES FOR 2007

 

     Beginning in May, 2000, I began including with each monthly summary

  an extra feature which I called the Feature of the Month. Beginning

  with July, 2005, I suspended these as a regular monthly item, but have

  since included some extra features as time permits. Following is an

  index to the Extra Features for 2007.

 

 

  JAN - INDEX TO EXTRA FEATURES FOR 2006

 

  FEB - 2007 TROPICAL CYCLONE NAMES for the Northwest Pacific

                   and North Indian Ocean Basins

 

  MAR - none

 

  APR - WESTERN HEMISPHERE TROPICAL CYCLONE NAMES for 2007

 

  MAY - GLOSSARY of ABBREVIATIONS and ACRONYMS

 

  JUN - A REVIEW OF THE 2006-2007 TROPICAL CYCLONE SEASON

                   FOR THE SOUTHERN HEMISPHERE

 

  JUL - HISTORY OF THE NAMING OF ATLANTIC TROPICAL CYCLONES

                  PART 1 - THE FABULOUS FIFTIES

 

  AUG - HISTORY OF THE NAMING OF ATLANTIC TROPICAL CYCLONES

                 PART 2 - THE SENSATIONAL SIXTIES

 

  SEP - SOUTHERN HEMISPHERE TROPICAL CYCLONE NAMES

                   2007 - 2008 SEASON

 

  OCT - HISTORY OF THE NAMING OF ATLANTIC TROPICAL CYCLONES

                   PART 3 - THE SUBDUED SEVENTIES

 

  NOV - HISTORY OF THE NAMING OF EASTERN AND CENTRAL NORTH PACIFIC

                           TROPICAL CYCLONES

 

  DEC - A REVIEW OF THE 2007 TROPICAL CYCLONE SEASON

                FOR THE NORTHERN HEMISPHERE

 

  NOTE!!! - The October, November and December summaries have not yet

            been released, but I do plan to include the extra features

            that I had previously planned.

 

***************************************************************************

 

                             ACTIVITY BY BASINS

 

  ATLANTIC (ATL) - North Atlantic Ocean, Caribbean Sea, Gulf of Mexico

 

  Activity for February: No tropical cyclones

 

  *************************************************************************

 

  NORTHEAST PACIFIC (NEP) - North Pacific Ocean East of Longitude 180

 

  Activity for February: No tropical cyclones

 

  *************************************************************************

 

  NORTHWEST PACIFIC (NWP) - North Pacific Ocean West of Longitude 180

 

  Activity for February: No tropical cyclones

 

  *************************************************************************

 

  NORTH INDIAN OCEAN (NIO) - Bay of Bengal and Arabian Sea

 

  Activity for February: No tropical cyclones

 

  *************************************************************************

 

  SOUTHWEST INDIAN OCEAN (SWI) - South Indian Ocean West of Longitude 90E

 

  Activity for February: 1 intense tropical cyclone

                          1 very intense tropical cyclone

 

 

                         Sources of Information

                         ----------------------

 

     The primary sources of tracking and intensity information for

  Southwest Indian Ocean tropical cyclones are the warnings issued by

  the Tropical Cyclone Warning Centre on La Reunion Island, part of

  Meteo France (MFR), and the Regional Specialised Meteorological Centre

  for the basin. However, tropical cyclones in this region are named

  by the Sub-regional Tropical Cyclone Advisory Centres in Mauritius and

  Madagascar with longitude 55E being the demarcation line between their

  respective areas of naming responsibility. The La Reunion centre only

  advises these agencies regarding the intensity of tropical systems.

  References to sustained winds imply a 10-minute averaging period unless

  otherwise stated.

 

     In the companion tropical cyclone tracks file, I occasionally

  annotate positions from warnings issued by the Joint Typhoon Warning

  Center (JTWC) of the U. S. Air Force and Navy, located at Pearl

  Harbor, Hawaii, when they differ from MFR's coordinates by usually

  40-50 nm or more. The JTWC warnings are also the source of the

  1-minute average maximum sustained wind values included in the

  tracks file. Additionally, information describing details of

  satellite imagery and atmospheric circulation features included in

  the narratives is often gleaned from the JTWC warnings.

 

 

           Southwest Indian Ocean Tropical Activity for February

           -----------------------------------------------------

 

     As the month opened, Tropical Cyclone Gula was weakening and becoming

  extratropical well to the east of southern Madagascar. Two tropical

  cyclones formed during early February with both becoming intense storms.

  Hondo reached the "very intense" stage with 10-min avg winds estimated

  at 120 kts, but remained in the eastern portion of the basin. After

  weakening, the remnants drifted westward for many days and flared up

  again to tropical depression status near the Mascarene Islands. Tropical

  Cyclone Ivan formed northeast of Madagascar, moved southeastward and

  described a large loop, then moved westward and intensified, eventually

  striking northeastern Madagascar as an intense cyclone. A report on

  Tropical Cyclone Hondo follows--for Ivan, I've deferred to the excellent

  online report available on the Wikipedia website.

 

 

 

                          TROPICAL CYCLONE HONDO

                             (MFR-10 / TC-16S)

                              4 - 25 February

                ------------------------------------------

                    

  Hondo: contributed by Zimbabwe

 

  A. Synoptic History

  -------------------

 

     Tropical Cyclone Hondo was a slow-moving cyclone which reached the

  "very intense tropical cyclone" stage per MFR's nomenclature, meaning

  peak 10-min avg winds 120 kts or higher. The storm was also notable for

  having two lives. Warnings were discontinued on the system on

  12 February, but nine days later and about 1500 nm to the west, the

  system began to regenerate, warranting the issuance of another round of

  warnings.

 

     The first MFR bulletin on Tropical Disturbance 10 was issued at 0600

  UTC on 4 February with the center located about 550 nm east-southeast of

  Diego Garcia. After some wobbles, the center began to pursue a

  southeasterly track as it rather quickly intensified. JTWC initiated

  warnings on TC-16S at 04/1200 UTC, and Tropical Storm Hondo was

  christened by the Meteorological Service of Mauritius at 05/0600 UTC

  with the center then located about 625 nm southeast of Diego Garcia.

  The storm quickly intensified, reaching cyclone (i.e., hurricane)

  intensity six hours later. The intensity remained steady for about

  24 hours, after which Hondo underwent a fairly rapid intensification

  episode. The storm reached its peak intensity of 120 kts at 1800 UTC

  7 February while located approximately 860 nm west-southwest of the

  Cocos Islands. The minimum CP estimated by MFR was 906 hPa, and JTWC's

  peak 1-min avg MSW was 125 kts. Based on MFR's warnings, gales extended

  outward from 70-90 nm from the center while JTWC's gale radii were

  somewhat larger.

 

     After peaking in intensity Hondo slowly began to weaken, although the

  winds remained pegged at 105 kts for about 30 hours on 8-9 February.

  The cyclone, which had been moving on a slow southeasterly course, began

  to turn to a more southerly track as it weakened. Winds had dropped

  below cyclone intensity (per both warning agencies) by 11/0000 UTC, and

  the system was reduced to tropical disturbance status at 12/1200 UTC

  while centered about 1250 nm east-southeast of Rodrigues Island. (JTWC

  had issued their final warning on Hondo at 12/0600 UTC.)

 

     Over the next nine days ex-Hondo degenerated into a very weak low

  pressure area with essentially no convection. Initially drifting west-

  northwestward, the system turned to more of a westward track around the

  17th. The disturbance gradually began to show signs of life on the

  20th, and MFR began issuing bulletins once more at 21/0000 UTC with the

  center located about 180 nm northeast of Mauritius. MFR upgraded

  ex-Hondo to a 30-kt tropical depression at 21/1800 UTC, but that

  represented the peak intensity during Hondo's second round (per MFR).

  JTWC, however, estimated that the system reached a peak 1-min avg MSW of

  45 kts at 23/1200 UTC while located only about 50 nm north-northeast of

  Reunion Island. During this second phase of Hondo's life, the system

  drifted west-southwestward, passing very near the northern end of

  Mauritius, thence bending a little more to the southwest and crossing

  Reunion Island. After that the system accelerated to the southwest and

  weakened. The final MFR bulletin placed the center about 525 nm south-

  southwest of Reunion at 0600 UTC 25 February.

 

 

  B. Synoptic Observations

  ------------------------

 

     The following information was sent to the author by Derrick Herndon:

 

     Buoy 53948 was located 30 nm southwest of the developing center at

  2200 UTC on the 4th and reported 999.5 mb, suggesting that the pressure

  was around 996 mb at the time. Hondo passed close to other buoys over

  the next few days but with no direct hits. It was not until the system

  was devoid of convection that it passed over another buoy on the 19th at

  1100 UTC which reported 1005.8 mb. The environmental pressure was about

  1010 mb and the swirl appeared to be producing winds of 30-35 kts.

  Rodrigues to the south of the buoy reported winds of 29G41 kts at 1600

  UTC on the 19th. Hondo then passed over Mauritius on the 23rd when

  Plaisance (FIMP) reported winds of 130@27G41 kts at 0100 UTC and a

  lowest pressure of 1003 mb at 0200 UTC. The center then passed over

  La Reunion Island where St Pierre (FMEP) reported winds 120@30G44 kts

  at 1000 UTC and a lowest pressure of 1002 mb at 1300 UTC.

 

 

  C. Damage and Casualties

  ------------------------

 

     No damage or casualties have been reported in association with

  Tropical Cyclone Hondo.

 

  (Report written by Gary Padgett with contributions by Derrick Herndon)

 

 

 

                           TROPICAL CYCLONE IVAN

                             (MFR-11 / TC-18S)

                              7 - 22 February

             -------------------------------------------------

 

  Ivan: contributed by Tanzania

 

     Tropical Cyclone Ivan was an intense tropical cyclone which made a

  very destructive and deadly strike in northeastern Madagascar with at

  least 93 persons killed. The cyclone reached a peak intensity of

  100 kts on 16 February (115 kts per JTWC--in good agreement with MFR)

  and weakened only slightly prior to making landfall.

 

     An excellent and detailed report covering Ivan is available on

  Wikipedia at the following link:

 

  http://en.wikipedia.org/wiki/Cyclone_Ivan

 

     My original report on Ivan, which was lost due to a hard drive

  crash, contained some observations collected by Derrick Herndon. If

  I am successful in getting Derrick to resend those, I will include them

  in a later summary.

 

  (Report written by Gary Padgett)

  

  *************************************************************************

 

  NORTHWEST AUSTRALIA/SOUTHEAST INDIAN OCEAN (AUW) - From 90E to 135E

 

  Activity for February: 1 tropical LOW **

                          1 overland tropical LOW ++

                          1 severe tropical cyclone

 

  ** - classified as a minimal tropical cyclone by JTWC

 

  ++ - became a tropical cyclone in March (TC Ophelia)

 

 

                         Sources of Information

                         ----------------------

 

     The primary sources of tracking and intensity information for

  Northwest Australia/Southeast Indian Ocean tropical cyclones are

  the warnings and advices issued by the Tropical Cyclone Warning

  Centres at Perth, Western Australia, and Darwin, Northern Territory.

  References to sustained winds imply a 10-minute averaging period

  unless otherwise stated.

 

     In the companion tropical cyclone tracks file, I occasionally

  annotate positions from warnings issued by the Joint Typhoon Warning

  Center (JTWC) of the U. S. Air Force and Navy, located at Pearl

  Harbor, Hawaii, when they differ from the Australian centres' coor-

  dinates by usually 40-50 nm or more. The JTWC warnings are also the

  source of the 1-minute average maximum sustained wind values included

  in the tracks file. Additionally, information describing details of

  satellite imagery and atmospheric circulation features included in

  the narratives is often gleaned from the JTWC warnings.

 

 

 

                              TROPICAL LOW

                                (TC-17S)

                            4 - 10 February

                  -----------------------------------

 

     TC-17S was a tropical LOW which was treated as a minimal tropical

  storm by JTWC but was not upgraded to tropical cyclone status by BoM

  Perth. The Perth TCWC initiated gale warnings on the LOW at 0000 UTC

  4 February with the center located about 375 nm southwest of Christmas

  Island. It was anticipated that the LOW might develop into a tropical

  cyclone, but later on the 4th the system began to weaken and the final

  shipping warning was issued at 2200 UTC with the center approximately

  450 nm southwest of Christmas Island. Over the next couple of days

  the system drifted eastward, and late on the 6th began to exhibit signs

  of intensification. JTWC issued their first warning on TC-17S at 0000

  UTC 7 February, placing the center 350 nm south of Christmas Island. The

  1-min avg MSW was estimated at 35 kts. Six hours later BoM Perth

  re-initiated gale warnings on the LOW, estimating the mean central winds

  at 30 kts with peripheral gales in the western quadrant.

 

     Over the next three days TC-17S drifted slowly east-southeastward as

  it was steered by a near-equatorial ridge, reaching a point approximately

  450 nm south-southeast of Christmas Island by 09/0000 UTC. Thereafter,

  the system turned to the north-northeast and began to weaken. The gale

  warning was cancelled and the final warnings by both Perth and JTWC were

  issued at 0000 UTC 10 February. The peak mean winds near the center were

  estimated at 30 kts by Perth, while JTWC's peak 1-min avg MSW reached

  40 kts at 1200 UTC 8 February. TC-17S formed and existed in an

  environment of moderate to high vertical shear which inhibited

  significant development.

 

     According to some information sent by Derrick Herndon, ship P3PB9 was

  located about 100 nm northwest of the center at 08/1800 UTC and reported

  winds 260@37 kts and a pressure of 1001 hPa. (It is unknown if this

  represents a 1-min or 10-min avg--likely the latter.) Dvorak ratings

  from SAB peaked at T3.0/3.0 from 07/0830 and 07/1430 UTC and also at

  08/1430 UTC. The lack of naming of this system is probably due to the

  particulars of BoM's basic definition of a tropical cyclone, namely that

  gales surround more than 50% of the center for at least six hours. This

  criterion was created to provide a somewhat objective method of

  distinguishing gale-bearing monsoon depressions from systems exhibiting

  a more normal tropical cyclone structure. During the previous season,

  two operationally-named systems, Isobel and Odette, were later downgraded

  due to not having met this requirement.

 

     No damage or casualties are known to have resulted from TC-17S.

 

  (Report written by Gary Padgett)

 

 

 

                      SEVERE TROPICAL CYCLONE NICHOLAS

                                  (TC-19S)

                              12 - 20 February

            ----------------------------------------------------

 

     Severe Tropical Cyclone Nicholas formed in mid-February from a

  tropical LOW off the Kimberley coast. During the time that the system

  was strengthening into a tropical cyclone it described a clockwise loop

  well to the northwest of Broome. Nicholas moved somewhat erratically

  on a general southwesterly track which later became southerly and

  carried the cyclone inland approximately 30 nm south-southwest of Coral

  Bay. Nicholas' peak intensity of 80 kts--Category 4 on the Australian

  Cyclone Severity Scale--was reached at 1800 UTC on 16 February while the

  cyclone was centered approximately 190 nm northwest of Port Hedland,

  Western Australia. JTWC's estimated peak 1-min avg MSW was also 80 kts,

  although occurring slightly earlier than BoM Perth's peak. The minimum

  CP was estimated at 944 hPa.

 

     A report with a track graphic for Cyclone Nicholas may be found on

  BoM's website at the following URL:

 

  http://www.bom.gov.au/announcements/sevwx/wa/watc20080210.shtml

 

  (Report written by Gary Padgett)

 

  *************************************************************************

 

  NORTHEAST AUSTRALIA/CORAL SEA (AUE) - From 135E to 160E

 

  Activity for February: Several monsoon LOWs **

 

  ** - one of these was briefly classified as a minimal tropical cyclone

       by JTWC

 

 

                          Sources of Information

                          ----------------------

 

     The primary sources of tracking and intensity information for

  Northeast Australia/Coral Sea tropical cyclones are the warnings

  and advices issued by the Tropical Cyclone Warning Centres at

  Brisbane, Queensland, and Darwin, Northern Territory, and on very

  infrequent occasions, by the centre at Port Moresby, Papua New

  Guinea. References to sustained winds imply a 10-minute averaging

  period unless otherwise stated.

 

     In the companion tropical cyclone tracks file, I occasionally

  annotate positions from warnings issued by the Joint Typhoon Warning

  Center (JTWC) of the U. S. Air Force and Navy, located at Pearl

  Harbor, Hawaii, when they differ from the Australian centres' coor-

  dinates by usually 40-50 nm or more. The JTWC warnings are also the

  source of the 1-minute average maximum sustained wind values included

  in the tracks file. Additionally, information describing details of

  satellite imagery and atmospheric circulation features included in

  the narratives is often gleaned from the JTWC warnings.

 

 

 

                               MONSOON LOWs

                             11 - 20 February

                   ------------------------------------

 

     Stormy weather associated with an active monsoon trough prevailed

  over much of the Coral Sea and eastern Australia for the middle third

  of the month of February. BoM Brisbane issued gale warnings for almost

  a continuous 10-day period from the 11th to the 20th, excepting only

  the 14th. At 1200 UTC on 11 February a monsoon LOW was located inland

  about 185 km south-southwest of Townsville, Queensland, producing gales

  to 40 kts over the eastern semicircle. The LOW moved southeastward,

  moving out over the Pacific at a point about 275 km north of Brisbane

  around 12/1200 UTC. Winds increased to storm force for a time after

  the LOW had entered the Pacific, but the system began to weaken on

  the 13th as it sped away toward the southeast. It was last mentioned

  at 13/0600 UTC when located about 375 nm east of Brisbane near 28S/160E.

 

     The Brisbane TCWC issued gale warnings non-stop from 0000 UTC on

  15 February through 1800 UTC on the 20th for various LOWs associated

  with the monsoon trough. None of these gave much indication of tropical

  cyclone development. Michael Bath, of McLeans Ridges, New South Wales,

  writes that one of the systems brought extraordinary rainfall to Mackay

  on the morning of the 15th with some locations receiving 600 mm in four

  hours. Localized flooding was extreme with homes and businesses

  inundated even though the main river was not the cause--it was purely

  from the volume of rain falling and unable to drain away. Additional

  information may be found at the following link:

 

  http://www.australiasevereweather.com/forum/index.php?topic=751.0

 

 

 

                               TROPICAL LOW

                                 (TC-20P)

                           28 February - 1 March

                 -----------------------------------------

 

     Yet another tropical LOW formed at the end of the month, being

  located at 0600 UTC 28 February about 100 nm northeast of Townsville.

  This LOW moved in an east-southeasterly direction, entering Wellington's

  AOR on 1 March. At 01/0600 UTC the system was located near 26.1S/162.4E,

  or about 525 nm east-northeast of Brisbane. The LOW was referred to in

  the warnings as a 'tropical' LOW, suggesting that it perhaps had some

  potential to develop into a tropical cyclone, but this never happened.

  Peripheral gales occurred at various times from the northeastern to

  southwestern quadrants. JTWC issued two warnings on this system as

  TC-20P. Following is a short table highlighting the two JTWC warnings

  on TC-20P:

 

     Date Time JTWC Position MSW (1-min) Brisbane Position

  ---------------------------------------------------------------------

 

    29 Feb 0600Z 21.2 S 154.3 E 30 kts 20.5 S 152.5 E

    29 Feb 1800Z 25.0 S 159.7 E 35 kts 23.8 S 157.6 E

 

    As can easily be seen, the JTWC coordinates were significantly

  different from BoM's. It seems likely that JTWC was following another

  LOW center within a larger area of disturbed weather.

 

  (Reports written by Gary Padgett)

 

  *************************************************************************

 

  SOUTH PACIFIC (SPA) - South Pacific Ocean East of Longitude 160E

 

  Activity for February: 1 tropical depression

                          1 tropical cyclone **

 

  ** - system formed in January and was treated as a January cyclone

 

 

                          Sources of Information

                          ----------------------

 

     The primary sources of tracking and intensity information for

  South Pacific tropical cyclones are the warnings and advisories

  issued by the Tropical Cyclone Warning Centres at Nadi, Fiji (for

  waters north of latitude 25S), and Wellington, New Zealand (for

  waters south of latitude 25S). References to sustained winds imply

  a 10-minute averaging period unless otherwise stated.

 

     In the companion tropical cyclone tracks file, I occasionally

  annotate positions from warnings issued by the Joint Typhoon Warning

  Center (JTWC) of the U. S. Air Force and Navy, located at Pearl

  Harbor, Hawaii, when they differ from the Southern Hemisphere

  centres' coordinates by usually 40-50 nm or more. The JTWC warnings

  are also the source of the 1-minute average maximum sustained wind

  values included in the tracks file. Additionally, information

  describing details of satellite imagery and atmospheric circulation

  features included in the narratives is often gleaned from the JTWC

  warnings.

 

 

                 South Pacific Tropical Activity for February

                 --------------------------------------------

 

     As the month began, Tropical Cyclone Gene was at its peak intensity

  southeast of Vanuatu. This tropical cyclone was unusual in that it

  maintained tropical cyclone status for several days after it had crossed

  25S into Wellington's AOR. A report on Tropical Cyclone Gene may be

  found in the January summary. One other system was designated a tropical

  depression by RSMC Nadi. This system formed near the border with

  Brisbane's AOR on the 17th and was numbered as TD-13F by Nadi. The

  depression subsequently moved southward and crossed into Wellington's

  AOR the next day without developing.

 

  *************************************************************************

 

         SPECIAL FEATURE - SOURCES OF TROPICAL CYCLONE INFORMATION

 

     The purpose of this section is to list some websites where many and

  varied types of tropical cyclone information are archived. Many readers

  will know about these already, but for the benefit of those who don't,

  I wanted to include them.

 

  (1) Aircraft Reconnaissance Information

  ---------------------------------------

 

     Various types of messages from reconnaissance aircraft may be

  retrieved from the following FTP site:

 

     ftp://ftp.nhc.noaa.gov/pub/products/nhc/recon/

 

     Information regarding how to interpret the coded reconnaissance

  messages may be found at the following URL:

 

     http://www.nhc.noaa.gov/reconlist.shtml

 

  Links are also included to websites with further information about the

  U. S. Air Force 53rd Weather Reconnaissance Squadron and the NOAA Air-

  craft Operations Center.

 

  (2) Archived Advisories

  -----------------------

 

     All the advisory products (public advisories, forecast/advisories,

  strike probabilities, discussions, various graphics) issued by TPC/NHC

  are archived on TPC's website. For the current year (using 2004 as an

  example), the archived products can be found at:

 

     http://www.nhc.noaa.gov/archive/2004/index.shtml

 

  Links to tropical products archives for earlier years are available at

  the following URL:

 

     http://www.nhc.noaa.gov/pastall.shtml

 

  JTWC warnings for past storms are archived on the NRL Monterrey website:

 

     http://www.nrlmry.navy.mil/tc_pages/tc_home.html

 

  On the NRL site, the link to past years can be found in the upper left

  corner of the screen.

 

     I am not aware at the moment of any other TCWC which archives all

  its tropical cyclone warning/advisory products for public access, but

  if I learn of any, I will add them to this list.

 

  (3) Satellite Imagery

  ---------------------

 

     Satellite images of tropical cyclones in various sensor bands are

  available on the NRL Monterrey and University of Wisconsin websites,

  courtesy of Jeff Hawkins and Chris Velden and their associates. The

  links are:

 

     http://www.nrlmry.navy.mil/tc_pages/tc_home.html

 

     http://cimss.ssec.wisc.edu/tropic/tropic.html

 

  On the NRL site, the link to past years can be found in the upper left

  corner of the screen. For the CIMSS site, a link to data archives is

  located in the lower left portion of the screen.

 

     Additional tropical satellite imagery, along with looping ability for

  composite microwave imagery for the Western Hemisphere north of the

  equator, can be found at:

 

  (1) For the Eastern North Pacific:

 

     http://www.ssd.noaa.gov/PS/TROP/trop-epac.html

 

  (2) For the Atlantic, Gulf of Mexico and Caribbean Sea:

 

     http://www.ssd.noaa.gov/PS/TROP/trop-atl.html

 

  (4) Cyclone Tracking Information

  --------------------------------

 

     There is a U. S. Navy site that tracks tropical cyclones at 6-hourly

  intervals which often includes pre and post-advisory positions. The

  link to the site is:

 

  http://www.nrlmry.navy.mil/atcf_web/doc_archives/

 

     Steve Young has compiled many of these tracks onto a single webpage

  which is very user-friendly:

 

  http://home.earthlink.net/~shy9/tc1.htm

 

 

     I'm sure there are other sites with available imagery available, and

  as I learn of them, I will add the links to this list.

 

  *************************************************************************

 

                               EXTRA FEATURE

 

     In order to shorten the amount of typing in preparing the narrative

  material, I have been in the habit of freely using abbreviations and

  acronyms. I have tried to define most of these with the first usage

  in a given summary, but I may have missed one now and then. Most of

  these are probably understood by a majority of readers but perhaps a

  few aren't clear to some. To remedy this I developed a Glossary of

  Abbreviations and Acronyms which I first included in the August, 1998

  summary. I don't normally include the Glossary in most months in

  order to help keep them from being too long. If anyone would like to

  receive a copy of the Glossary, please e-mail me and I'll be happy

  to send them a copy.

 

  *************************************************************************

 

  AUTHOR'S NOTE: This summary should be considered a very preliminary

  overview of the tropical cyclones that occur in each month. The cyclone

  tracks (provided separately) will generally be based upon operational

  warnings issued by the various tropical cyclone warning centers. The

  information contained therein may differ somewhat from the tracking and

  intensity information obtained from a "best-track" file which is based

  on a detailed post-seasonal analysis of all available data. Information

  on where to find official "best-track" files from the various warning

  centers will be passed along from time to time.

 

    The track files are not being sent via e-mail. They can be retrieved

  from the archive sites listed below. (Note: I do have a limited e-mail

  distribution list for the track files. If anyone wishes to receive

  these via e-mail, please send me a message.)

 

    Both the summaries and the track files are standard text files

  created in DOS editor. Download to disk and use a viewer such as

  Notepad or DOS editor to view the files.

 

     The first summary in this series covered the month of October,

  1997. Back issues can be obtained from the following websites

  (courtesy of Michael Bath, Michael V. Padua, Michael Pitt, and Chris

  Landsea):

 

    http://australiasevereweather.com/cyclones/

    http://www.typhoon2000.ph <http://www.typhoon2000.ph/>

    http://mpittweather.com <http://mpittweather.com/>

    ftp://ftp.aoml.noaa.gov/hrd/pub/landsea/padgett/

 

 

     Another website where much information about tropical cyclones may

  be found is the website for the UK Meteorological Office. Their site

  contains a lot of statistical information about tropical cyclones

  globally on a monthly basis. The URL is:

 

    http://www.metoffice.gov.uk/weather/tropicalcyclone

    

 

                    TROPICAL CYCLONE REPORTS AVAILABLE

 

     JTWC now has available on its website the Annual Tropical Cyclone

  Report (ATCR) for 2006 (2005-2006 season for the Southern Hemisphere).

  ATCRs for earlier years are available also.

 

     The URL is: http://metocph.nmci.navy.mil/jtwc.php

 

     Also, TPC/NHC has available on its webpage nice "technicolor"

  tracking charts for the 2007 Atlantic and Eastern North Pacific

  tropical cyclones; also, storm reports for all the 2007 Atlantic

  and Eastern North Pacific cyclones are now available, as well as

  track charts and reports on storms from earlier years.

 

     The URL is: http://www.nhc.noaa.gov <http://www.nhc.noaa.gov/>

 

 

     A special thanks to Michael Bath of McLeans Ridges, New South Wales,

  Australia, for assisting me with proofreading the summaries.

 

 

  PREPARED BY

 

  Gary Padgett

  E-mail: garyp@alaweb.com

  Phone: 334-222-5327

 

  Kevin Boyle (Northwest Pacific)

  E-mail: newchapelobservatory@btinternet.com

 

  *************************************************************************

  *************************************************************************

 

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