2007–08 South-West Indian Ocean cyclone season

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2007–08 South-West Indian Ocean cyclone season
Seasonal boundaries
First system formedJuly 27, 2007
Last system dissipatedSeason currently active
Strongest storm
NameHondo
 • Maximum winds220 km/h (140 mph)
(10-minute sustained)
 • Lowest pressure906 hPa (mbar)
Seasonal statistics
Total depressions9
Total storms9 official, 1 unofficial
Tropical cyclones3
Total fatalitiesUnknown
Total damageUnknown
South-West Indian Ocean tropical cyclone seasons
2005-06 2006-07 2007-08 Post-2008
Related articles 2007-08 Australian region cyclone season
2007-08 South Pacific cyclone season
Tropical cyclone scales

The 2007-08 South-West Indian Ocean cyclone season is an event in the annual cycle of tropical cyclone formation. It began on November 15, 2007, and will end on April 30, 2008, with the exception for Mauritius and the Seychelles, for which it will run until May 15. These dates conventionally delimit the period of each year when most tropical cyclones form in the basin, which is west of 90°E and south of the Equator. Tropical cyclones in this basin are monitored by the Regional Specialised Meteorological Centre in Réunion.

Storms

Unnamed Tropical Cyclone

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

An area of low pressure on the edge of the area of responsibility with Perth formed into tropical disturbance on July 27. Although no advisory was issued it was monitored and designated a number[1] by Meteo-France. The Joint Typhoon Warning Center had issued a Tropical Cyclone Formation Alert [2] on the developing system a day earlier, and began warnings on Tropical Cyclone 01S later on July 29 with the storm estimated to be centred within Perth's region. The cyclone began to dissipate early on July 30, with the JTWC discontinuing advisories later that day [3] and the Bureau of Meteorology issuing its last warning the next day.

The Bureau of Meteorology upgraded the disturbance to a tropical cyclone in its post-storm analysis, with maximum winds of 40 kt based on QuikSCAT observations.[4]

Tropical Disturbance 01R

The first officially recognised tropical disturbance formed early on October 10. It traveled in a south-westerly direction, and early on October 12, it was designated as Tropical Disturbance 01R.[5] The upper-level environment near the cyclone was favourable, but the combination of a lack of equatorward low-level inflow and low sea-surface temperatures caused the cyclone to dissipate early on October 13.[6]

Severe Tropical Storm Lee-Ariel

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

On November 13, the Tropical Cyclone Warning Centre (TCWC) in Perth began issuing warnings on a developing tropical low which was located within the area of responsibilty of TCWC Jakarta, and was also on the edge off RSMC La Réunion's area of responsibility.[7] On November 14, TCWC Perth upgraded the Tropical Low to Tropical Cyclone Lee, while the cyclone was still in TCWC Jakarta's area of responsibility. [8] Later that day the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on Tropical Cyclone Lee,[9] and then designated the storm as Tropical Cyclone 03S shortly after.[10] The TCWC in Perth upgraded Lee to a Category 2 cyclone on November 15. Later that day TCWC Perth issued its final advisory on Lee, as it moved into RSMC La Réunion's area of responsibility. [11] It was renamed by the Sub-Regional Tropical Cyclone Advisory Centre in Mauritius as Severe Tropical Storm Ariel. [12]

Soon after entering the South-West Indian Ocean, Ariel encountered an unfavourable environment and began weakening, and RSMC La Réunion downgraded it to a moderate tropical storm on November 17,[13] and then to a tropical depression later that day. [14] Both RSMC La Reunion and the JTWC issued their final advisories late on November 18.[15][16]

Severe Tropical Storm Bongwe

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

An area of disturbed weather developed east of Diego Garcia on November 15. The system slowly organised as it moved southeastward and began interacting with Severe Tropical Storm Ariel, and the Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert on November 17.[17] The JTWC upgraded the system to Tropical Cyclone 04S early the next day.[18] Also on November 18, RSMC La Reunion classified the system as Tropical Disturbance 03.[19] Later that day, RSMC La Reunion upgraded it to Tropical Depression 03.[20] It was upgraded to Moderate Tropical Storm Bongwe on November 19 and a Severe Tropical Storm later that day.[21][22] Increased wind shear early on November 20 slowed the intensification trend, and weakened it to a moderate tropical storm.[23] However, it restrengthened to a severe tropical storm on November 22.[24] The restrengthening trend was short-lived, however, as the storm weakened once again on November 23,[25] down to a depression and then a disturbance,[26][27] until it finally dissipated on November 24.[28]

Moderate Tropical Storm Celina

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

An area of disturbed weather developed early on the December 12 north-northeast of Rodrigues.[29] Later that day it was designated as Tropical Disturbance 04R. [30]. The Joint Typhoon Warning Center then issued a Tropical Cyclone Formation Alert on the developing system late on December 12.[31] The JTWC issued its first warning on December 13, designating the storm as Tropical Cyclone 06S.[32] Although the low level circulation center was exposed the system was upgraded to a tropical depression by Météo-France on December 14 due to a better low level circulation.[33] Early on December 17 Mauritius Meteorological Service upgraded the system to a moderate tropical storm and named it "Celina" as it approaches Mauritius Island.[34]

Weakening took place on December 18, and the JTWC issued its final advisory early that day.[35] Meteo-France maintained the system as a tropical depression.[36][37] Météo-France issued its final advisory on December 21 as it begins to dissipate just east of southeastern Madagascar.[38]

Moderate Tropical Storm Dama

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

An area of disturbed weather begin developing east of 90ºE near Cocos Island, eventually crossing into the southwestern Indian Ocean early on December 17. The Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert early December 18.[39] RSMC Réunion designated the system a tropical disturbance early in the afternoon as the convection begin to deepen and isolate itself from the disturbance to its northwest.[40] The Joint Typhoon Warning Center designated the tropical disturbance as Tropical Cyclone 07S.[41] The weak vertical wind shear allowed the system to deepen into a tropical depression in the early evening of December 18.[42] The system temporarily reached moderate tropical storm intensity on December 19 but persistent vertical wind shear caused it to rapidly weaken back into a tropical depression.[43] However, the next day, decreasing wind shear allowed convection to form closer to the center for 05R to reclassify as a moderate tropical storm status and earned the name "Dama."[44] The Joint Typhoon Warning Center and Météo-France issued its final advisory on December 21 as it transitioned to an extratropical system.[45][46]

Moderate Tropical Storm Elnus

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

Early on December 30 an area of disturbed weather formed west of Madagascar and was designated as 06R.[47] Later that day it was upgraded to Tropical Disturbance 06R,[48] whilst the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on the developing system.[49] On December 31, Meteo-France upgraded the disturbance to tropical depression status.[50] Soon after, the JTWC upgraded the system to Tropical Cyclone 09S.[51] Early on January 1, the depression was upgraded to Moderate Tropical Storm Elnus, while located in the Mozambique Channel.[52] On January 2, Meteo-France downgraded the system to Tropical Depression ex-Elnus,[53] and then to a tropical disturbance the next day.[54] The JTWC issued its last advisory on January 4 as it transisted to an extratropical system. Meteo-France noted the storm was becoming extratropical on January 4,[55] and on January 6 issued its final advisory on Extratropical Depression ex-Elnus as the system passed to the south of Madagascar.[56]

Tropical Disturbance 07R

Early on January 7 an area of disturbed weather north-northeast of Reunion was designated as Tropical Disturbance 07R by Météo-France. [57] The storm never got organised and by January 8, the storm had dissipated.[58]

Tropical Cyclone Fame

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

An area of of disturbed weather formed north of Madagascar and was designated as Tropical Disturbance 08R on January 24. On the next day it was upgraded to Tropical Depression 08R by Météo-France, while the Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert on the developing system. it was then upgraded to "Moderate Tropical Storm Fame" by the Sub-Regional Tropical Cyclone Advisory Centre in Madagascar. It remained nearly stationary and by January 26 it was upgraded to a severe tropical storm. The storm made landfall over northwestern Madagascar as a severe tropical storm on January 27. Later that day the system temporarily reached tropical cyclone stage just before landfall near Malagasy.[59] It dissipated early on January 28 over Madagascar. The system, however, regenerated on January 29 as it re-emerged over water and became a tropical depression once again.[60] However, Fame did not strengthen further, and after being declared extratropical,[61] Météo-France redeclared the system tropical and issued its last advisory.[62]

Tropical Cyclone Gula

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

An area of disturbed weather formed over the south-central Indian Ocean in the fourth week of January. It slowly developed and Meteo-France began monitoring it as a disturbed area of weather on January 26. It was upgraded to a tropical depression later that day and was named as moderate tropical storm Gula on January 27 by the Mauritius Meteorological Service. Intensification continued and it was upgraded to a severe tropical storm on January 28. The intensification trend became more rapid early on January 29 as a clear eye developed and the storm became a tropical cyclone.[63] After weakening and oscillating between severe and moderate status,[64][65][66][67]Météo-France declared it an extratropical depression,[68] and then issued its last advisory on February 2.[69]

Very Intense Tropical Cyclone Hondo

 
DurationUnknown – Unknown
Peak intensityWinds not specified;

On February 4, an area of disturbed weather approximately 560 nm southeast of Diego Garcia was declared Tropical Disturbance 10R.[70] Early on February 5, the storm was upgraded to Moderate Tropical Storm Hondo.[71] The storm began rapidly intensifying after that, skipping severe tropical storm status entirely and being declared Tropical Cyclone Hondo a few hours later.[72] On the evening of February 6, Hondo was upgraded to intense tropical cyclone status, with sustained winds of 100kt.[73] Intensification continued, and Hondo reached very intense status on February 7.[74]It then fluctuated in intensity for a while. Wind shear and low ocean heat content rapidly weakened the system, and on February 12 the JTWC and Météo-France issued their final advisories on the system.

Tropical Cyclone Ivan

Tropical Cyclone Ivan (11R)
Tropical Cyclone 18S
Current storm status
Tropical storm (1-min mean)
Satellite image
As of:2100 UTC February 12
Location:14.2ºS 62.9°E
Sustained winds:45 kt (85 km/h, 50 mph) (10-min mean)
55 kt (100 km/h, 65 mph) (1-min mean)
gusting to 70 kt (130 km/h, 80 mph)
Pressure:987 hPa
Movement:W at 2 kt (3 km/h, 2 mph)
See more detailed information.

Early on February 7, an area of disturbed weather northeast of Madagascar was designated Tropical Depression 11R.[75] Like Cyclone Hondo before it, the storm intensified quickly into Moderate Tropical Storm Ivan,[76] then reached severe status a few hours later.[77]

Timeline of recent events

Main article: Timeline of the 2007-08 South-West Indian Ocean cyclone season

February

February 4
0600 UTC - Météo-France designates 93S.INVEST as Tropical Disturbance 10R.[78]
February 5
0000 UTC - Météo-France upgrades Tropical Disturbance 10R to Tropical Depression 10R.
0600 UTC - Mauritius Meteorological Service upgrades Tropical Depression 10R to Moderate Tropical Storm Hondo.[79]
1200 UTC - Météo-France upgrades Moderate Tropical Storm Hondo to Tropical Cyclone Hondo.[80]
February 6
1800 UTC - Météo-France upgrades Tropical Cyclone Hondo to Intense Tropical Cyclone Hondo.[81]
February 7
0600 UTC - Météo-France designates 94S.INVEST as Tropical Depression 11R.[82]
1200 UTC - Mauritius Meteorological Services upgraded Tropical Depression 11R to Moderate Tropical Storm Ivan.[83]
1800 UTC - Météo-France upgrades Intense Tropical Cyclone Hondo to Very Intense Tropical Cyclone Hondo.[84]
1800 UTC - Météo-France upgrades Moderate Tropical Storm Ivan to Severe Tropical Storm Ivan.[85]
February 8
0000 UTC - Météo-France downgrades Very Intense Tropical Cyclone Hondo to an intense tropical cyclone.
February 10
0600 UTC - Météo-France downgrades Intense Tropical Cyclone Hondo to a tropical cyclone.

Storm names

Tropical disturbances are named upon reaching moderate tropical storm strength.[86] If a tropical disturbance reaches this intensity west of 55°E, then the Sub-Regional Tropical Cyclone Advisory Centre in Madagascar assigns the appropriate name to the storm. If it reaches moderate tropical storm strength between 55°E and 90°E, then the Sub-Regional Tropical Cyclone Advisory Centre in Mauritius names the storm.[86] New name lists are used every year, so no names are retired.

2007-08 storm names
  • Ariel
  • Bongwe
  • Celina
  • Dama
  • Elnus
  • Fame
  • Gula
  • Hondo
  • Ivan (active)
  • Jokwe (unused)
  • Kamba (unused)
  • Lola (unused)
  • Marabe (unused)
  • Nungu (unused)
  • Ofelia (unused)
  • Pulane (unused)
  • Qoli (unused)
  • Rossana (unused)
  • Sama (unused)
  • Tuma (unused)
  • Uzale (unused)
  • Vongai (unused)
  • Warona (unused)
  • Xina (unused)
  • Yamba (unused)
  • Zefa (unused)

References

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See also

Template:Tcportal

External links

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