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2007-08 Australian region cyclone season
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Australian Region
Tropical Cyclone Intensity Scale
| Category |
Wind Speeds |
Gusts |
| Tropical Low |
<34 kt |
N/A |
| One |
34-47 kt |
<66 kt |
| Two |
48-63 kt |
67-90 kt |
| Three |
64-85 kt |
91-121 kt |
| Four |
86-110 kt |
121-150 kt |
| Five |
> 111 kt |
> 151 kt |
The 2007-08 Australian region cyclone season got off to an early start with the formation on July 27th of the first Tropical Cyclone which was not upgraded operationally to a cyclone but was later upgraded to a Cyclone during post storm analysis. This was the second time that a tropical Cyclone had formed during the month of July. The other one was Cyclone Lindsay in the 1996-1997 season. The next cyclone that formed was Cyclone Guba which formed on November 13th with TCWC Port Moresby assigning the name Guba on November 14th which was the first named storm within TCWC Port Moresby’s area of responsibility since Cyclone Epi in June 2003. Guba was also the first cyclone to occur in the Queensland region in the month of November since 1977.
Tropical Cyclone Lee also formed on November 13th and was named by TCWC Perth on November 14th with it moving into RSMC La Reunion's area of responsibility and being renamed Ariel. The next Cyclone to form within the Australian region was Melanie which formed on December 27th and was named on the 28th by TCWC Perth. Melanie was the first storm of the season which required Cyclone watches and warnings were issued for the Pilbara coast however it had weakened into a low pressure area before it made landfall.
Tropical Cyclone Helen was the first Tropical Cyclone to form in 2008 in the Southern Hemisphere which formed in TCWC Darwin’s area of responsibility and was the first time that Darwin had experienced a tropical cyclone since Tropical Cyclone Gretel in the 1984-85 season.[1] Cyclone Nicholas made landfall north of Carnarvon on February 20th as a category one cyclone. Cyclone Ophelia actually formed in TCWC Darwin’s area of responsibility but had moved into TCWC Perth’s area when it was named. Tropical Cyclone Pancho formed on March 23rd south of Christmas Island and was named by TCWC Perth on March 25th and reached Category 4 status with winds of 95 Knots.
In April 2008 Tropical Cyclones Rosie & Durga were the first ever Tropical Depressions to be monitored within TCWC Jakarta’s area of responsibility and Durga was also the first storm to reach Tropical cyclone status and named whilst being monitored by TCWC Jakarta. Durga was also the last storm of the season which officially ended on April 30th. This Season also had no Tropical Cyclones which were above category three on the Saffir-Simpson Hurricane Scale, which was the first time this happened on record.
Storms
- See also: Timeline of the 2007-08 Australian region cyclone season
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Tropical cyclones of the 2007–08 Australian region cyclone season
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BOM Tropical Cyclone
Strength Classifications |
| L |
C1 |
C2 |
C3 |
C4 |
C5 |
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Unnamed Tropical Cyclone
On July 29th an area of low pressure close to the edge off RSMC La Reunions Area of responsibility, was designated as Tropical Disturbance 01R, by the RSMC in La reunion. [2] However this number was withdrawn in RSMC La reunions post storm Analysis. [3] The JTWC issued a Tropical Cyclone Formation Alert (TCFA) on the developing system on July 29 [4] and initiated warnings on the tropical cyclone late that day designating it as Tropical cyclone 01S. [5] However by this time the cyclone had crossed 90E and had crossed into TCWC Perth’s Area of Responsibility, who designated it as a Tropical Low and issued shipping warnings on the Tropical Low.[3] Early on July 30 The Cyclone began to dissipate so the JTWC issued their final advisory that day. [6] and the Bureau of Meteorology issued its last warning the next day.[3]
During Post storm analysis The Bureau of Meteorology upgraded the Tropical low to a tropical cyclone in its post-storm analysis, with maximum 10-min sustained winds of 75 km/h (45 mph) based on QuikSCAT observations. The cyclone's intensity was estimated to have reached cyclone intensity from July 29 to July 30. [3]
The cyclone is the second on record to exist in the Western Australian region in July, the other being Cyclone Lindsay in 1996. [3]
Severe Tropical Cyclone Guba
- Main article: Cyclone Guba
The Tropical Cyclone Warning Centre (TCWC) in Brisbane began issuing warnings on a developing tropical low which was located near the southern Papua New Guinea mainland on November 13, 2007,[7] while the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on the storm.[8] Later that day, the JTWC issued its first advisory, designating the low as Tropical Cyclone 02P.[9] TCWC Brisbane initiated tropical cyclone advices on the tropical low early on November 14. Shortly after, TCWC Brisbane upgraded the system to Tropical Cyclone Guba, which was a name assigned by the TCWC in Port Moresby.[10] Guba drifted erratically off the Queensland coast for the next two days, and intensified on November 16, becoming a Category 3 severe tropical cyclone. Guba was a small, but intense system, forming a well-defined eye. Guba began weakening on November 17 as it started to accelerate to the west towards the Queensland coast. However, it later turned northwards, avoiding the Australian mainland, then northeast while it continued to weaken. TCWC Brisbane downgraded Guba below tropical cyclone strength, and issued its last advisory early on November 20.
Flooding in Papua New Guinea led to at least 150 deaths.[11] In the Oro Province, about 2,000 people were evacuated as a result of the flooding.[12] Roads, bridges and 40 houses were washed away, as tides in the area reached two metres high.[13] The provincial capital, Popondetta, had its water supply shut down, and Papua New Guinea's national airline, Air Niugini, suspended flights to Popondetta's main airport. The Rabaraba district in Milne Bay Province was also hit by flooding, with 30 houses and food gardens washed away, and forcing the evacuation of about 100 people.[12] The government in Papua New Guinea reported that an estimated 145,000 people were affected from the flooding in Oro Province.[14] Six days of torrential rain led to a damage total of 200 million kina ($71.4 million USD). Guba was the first tropical cyclone to be assigned a name from Port Moresby's name lists since Tropical Cyclone Epi in 2003. It is the first cyclone to occur in the Queensland region in the month of November since 1977.[15]
Tropical Cyclone Lee-Ariel
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 responsibility of TCWC Jakarta.[16] 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.[17] Later that day the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on Tropical Cyclone Lee,[18] and then designated the storm as Tropical Cyclone 03S shortly after.[19] The TCWC in Perth upgraded Lee to a Category 2 on November 15. Later that day, TCWC Perth issued its final advisory on Lee as it crossed west of 90°E,[20] and the system was renamed Severe Tropical Storm Ariel by the Sub-Regional Tropical Cyclone Advisory Centre in Mauritius; see 2007-08 South-West Indian Ocean cyclone season.[21]
Tropical Low (ex Tropical Cyclone Dama)
On December 18, a Tropical Depression in the southwest Indian Ocean was named Moderate Tropical Storm Dama, monitored by Météo France. The system then moved southeast, entering the area of responsibility of Perth's Tropical Cyclone Warning Centre, east of 90°E. The storm however, was not at Tropical Cyclone strength when it crossed the area, but was still a tropical depression, in which the Perth TCWC began issuing shipping warnings.
Tropical Cyclone Melanie
On December 27, the Tropical Cyclone Warning Centre (TCWC) in Perth identified a Tropical Low near 11.2°S and 117.2°E, and began issuing shipping warnings for the developing system.[22] Early on December 28, the TCWC in Perth upgraded the tropical low to a tropical cyclone and named it Melanie.[23] The cyclone moved southwards, then turned to the southwest on December 29 and strengthened to a Category 2 (Australian scale).[24] Cyclone watches and warnings were issued for the Pilbara coast. On December 30 Melanie began to weaken and become less organized. Melanie continued to weaken and the system was downgraded to Category 1 status on December 31. Continued weakening took place thereafter and it weakened below cyclone status early on January 2, when the final advisory was issued.[25]
Tropical Low (WA)
On December 31, the Tropical Cyclone Warning Centre (TCWC) in Perth identified a Tropical Low north-northwest of the Cocos Islands, and began issuing shipping warnings. [26] The low then moved southwest for the next few days, where it proceeded to enter an area of high vertical Wind Shear, and began to rapidly weaken. The TCWC issued its final shipping warning on January 2. [27]
Tropical Cyclone Helen
In late December a Tropical low formed over the Top End which was slow moving in the eastern Top End on December 29, which began moving west during January 1 at the base of the Top End, by the evening of January 2 the Tropical low moved into the Joseph Bonaparte Gulf[28]. On January 3 at 11am ACST the TCWC in Darwin, Australia, located near the edge of their Area of Responsibility, with TCWC Perth, declared a Tropical Cyclone Warning for the coastal areas from Mitchell Plateau in Western Australia to the Daly River Mouth in Northern Territory with a Tropical Cyclone Watch declared for coastal areas from the Daly River Mouth to Goulburn Island which also included Darwin [29][28].Later that day a TCFA was issued by the JTWC who then upgraded the low to a Tropical Cyclone designating the cyclone 10S later that day [30] [31]. On January 4 at 8am, TCWC Darwin upgraded the Tropical Cyclone Warning to included Darwin, by 11am the TCWC Darwin upgraded the Tropical low to Tropical Cyclone Helen which was located 380km to the west/south west of Darwin moving towards the north East[28][32]. During the afternoon of January 4 Tropical Cyclone Helen was steadily moving towards the east to the Daly River Mouth region, Approximately 7pm TCWC Darwin upgraded the intensity to 50 knots (Category 2), making landfall at Channel Point approximately 130km southwest of Darwin at 10pm[28][33], started to weaken due to interaction with land with it weakening in to a tropical low on January 5 as it had become less orgainsed. [34]. on January 6 the JTWC issued its final warning on Tropical Cyclone Helen, [35] and then later that day TCWC Darwin followed suit and issued its final advisory on Tropical Low Ex-Helen as it approached TCWC Brisbane's Area of Responsibility. [36]
The strongest wind gust recorded was at Charles Point Lighthouse with 120 kilometres an hour recorded during the Tropical Cyclone with Darwin Airport recording 102 kilometres an hour around 2am ACST making it the first time since April 1985 for Darwin to experienced Category 1 or more when since Tropical Cyclone Gretel past Darwin on 12 April 1985[28][37][38].
Tropical Low (17S)
On February 4, the Tropical Cyclone Warning Centre (TCWC) in Perth identified a Tropical Low South west of Christmas Island, and began issuing shipping warnings.[39] Initially it was thought that it was going to intensify into a tropical Cyclone but later on February 4, The cyclone began to weaken with the final gale warnings being issued by TCWC Perth later that day. Over the next few days the system drifted eastwards and then on February 6 began showing signs of intensification. [40] The Following day, the Joint Typhoon Warning Center (JTWC) issued its first advisory, designating the low as Tropical Cyclone 17S. [41] Later that day TCWC Perth reintiated Gale warnings on the tropical low. [40] On February 10 The TCWC Perth and the JTWC issued their final advisories on the system.[42]
Severe Tropical Cyclone Nicholas
On February 10, the Tropical Cyclone Warning Centre (TCWC) in Perth identified a Tropical Low near 16.0°S and 124.7°E, and began issuing tropical cyclone advices on the system.[43] On February 12, the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on the developing system.[44] Later in the day, the JTWC issued its first advisory, designating it as Tropical Cyclone 19S.[45] Early on February 13, the Tropical Cyclone Warning Centre in Perth upgraded the tropical low to a tropical cyclone and named it "Nicholas".[46][47] On February 16, Nicholas was upgraded to a Severe Tropical Cyclone,[48] but it was downgraded back to a tropical cyclone on February 18.[49] Nicholas squirmed around Western Australia before finally making landfall north of Carnarvon on February 20.[50] Once inland, TCWC Perth discontinued advisories.[51] The cyclone caused gales over the North West cape in Western Australia, and the town of Exmouth was on high alert.[52]
Tropical Cyclone Ophelia
On February 27, 2008 the Tropical Cyclone Warning Centre (TCWC) in Darwin identified a Tropical Low near the Northern Territory, and began issuing tropical cyclone advices on the system.[53] On February 29, the JTWC issued a Tropical Cyclone Formation Alert on the developing system.[54] On March 1, the JTWC issued their first warning on Tropical Cyclone 21S.[55] The low moved into TCWC Perth's area of responsibility during the day. The low strengthened as it moved off the Kimberley coast, and was upgraded to Tropical Cyclone Ophelia by TCWC Perth.[56] Ophelia intensified to a Category 2 cyclone on the Australian scale early on March 2. The JTWC briefly upgraded Ophelia to a Category 1 cyclone on the Saffir-Simpson Hurricane Scale later that day, but was downgraded to a tropical storm on the next advisory. Ophelia continued on a general south-westerly track parallel to the coast, and eventually weakened out to sea as TCWC Perth discontinued advisories[57].
Tropical Low (20P)
Early on February 28, Tropical Cyclone Warning Center Brisbane identifed a Tropical low which was located about 100 nautical miles north-east of Townsville, Queensland and started issuing Gale Warnings on the low [40] Later that day the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on this tropical low which was located northeast of Australia.[58] The next day, the JTWC issued its first advisory on the Tropical Low designating it as Tropical Cyclone 20P.[59] Later that day, the JTWC issued its final advisory on the system noting the storm was becoming extratropical.[60]. However TCWC Brisbane continued to issue warnings on this Tropical Low as it approached the edge of Brisbanes Area off responsibility. On March 1 TCWC Brisbane issued its final Gale warning for the northern region as the Low moved into TCWC Wellingtons Area of responsibility. [61]
Severe Tropical Cyclone Pancho
On March 23 a Tropical low formed southwest of Christmass island. [62] The next day TCWC Perth, began issuing shipping warnings on the Tropical low. [63] Later that day the JTWC issued a Tropical Cyclone Formation Alert, on the tropical low. They then started issuing warnings that day designating it as Tropical Cyclone 26S. [64] [65] The low then intensified in to a Tropical Cyclone and was named Pancho by TCWC Perth early on March 25.[66]
The Next day Pancho became a severe tropical cyclone on the Australian scale, [67] with Pancho rapidly intensified in to a minimal Category four cyclone on the Australian scale on March 27. However during the 28th, Tropical Cyclone Pancho entered an area of increasing vertical wind shear and cooler sea surface temperatures and within a few hours it was downgraded back to a Category 2 cyclone on the Australian scale.[68]. The cyclone then weakened back to a tropical low about 300 kilometers southwest of the Western Australian Gascoyne coast with gale-force winds remaining south of the low. with both TCWC Perth and the JTWC issuing their final warnings on Pancho that day. [69] [70]
Tropical Cyclone Rosie
A tropical low formed southwest of Sumatra Indonesia, On April 18.[71] The Tropical Cyclone Warning Centre (TCWC) in Jakarta then designated it as a Tropical Depression early on April 20th. [72] The next day as the Tropical Depression moved southwards the Joint Typhoon Warning Centre (JTWC) issued a Tropical Cyclone Formation alert on the developing system,[73] and then later that day upgraded the tropical depression to Tropical Cyclone 28S.[74] On April 22 The Tropical Depression then moved into TCWC Perth's Area of responsibility and was upgraded to Tropical Cyclone Rosie.[75] On April 23 Rosie encountered high vertical wind shear and began weakening, being downgraded in the early hours of the next day to a tropical low.[76] The JTWC issued their last warning on the cyclone on April 24 as well.[77]
Tropical Cyclone Durga
On April 21 The Joint Typhoon Warning Center (JTWC) identified a Tropical Disturbance which was located just inside Météo France's Area Of Responsibility (AOR) and issued a Tropical Cyclone Formation Alert on the developing system.[78] However, RSMC La Reunion did not monitor the storm. The disturbance then moved out of Météo France's AOR, and into TCWC Jakarta's AOR, who then designated it as a Tropical Depression on April 22. [79] Later that day The JTWC initiated warnings on the Tropical Depression designating it as Tropical Cyclone 29S.[80] Early the next day TCWC Jakarta Assigned the name Durga to the cyclone.[81] The cyclone then weakened as it moved into TCWC Perth's area of responsibility, between Cocos and Christmas Islands. TCWC Perth then issued their final warnings on Ex Tropical Cyclone Druga as it was downgraded to a tropical low on 25 April. [82]
Storm names
Tropical cyclones in this area were monitored by five Tropical Cyclone Warning Centres (TCWCs): the Australian Bureau of Meteorology in Perth, Darwin, and Brisbane; TCWC Jakarta in Indonesia; and TCWC Port Moresby in Papua New Guinea.[83] The Joint Typhoon Warning Centre also issues unofficial warnings for the region, designating tropical depressions with the "S" suffix when they form west of 135°E, and the "P" suffix when they form east of 135°E. [83].
Indonesia
Tropical cyclones that developed between the Equator and 10°S and between 90°E and 125°E were assigned names by the Tropical Cyclone Warning Centre in Jakarta, Indonesia.[83]
Southeast Indian Ocean
Tropical cyclones that developed east of 90°E, south of 10°S, and west of 125°E were assigned names by the Tropical Cyclone Warning Centre in Perth, Western Australia.[83] 01S was monitored as a Tropical Low operationally but during post Storm Anaylis was upgraded to tropical cyclone status by TCWC Perth.
Arafura Sea and Gulf of Carpentaria
Tropical cyclones that developed south of the Equator between 125°E and 141°E were assigned names by the Tropical Cyclone Warning Centre in Darwin, Northern Territory.[83]
Coral Sea
Tropical cyclones that developed south of 10°S between 141°E and 160°E were assigned names by the Tropical Cyclone Warning Centre in Brisbane, Queensland.[83]
No Tropical Cyclones formed in this Area in 2007-08
Solomon Sea and Gulf of Papua
Tropical cyclones that develop north of 10°S between 141°E and 160°E were assigned names by the Tropical Cyclone Warning Centre in Port Moresby, Papua New Guinea.[83] Tropical cyclone formation in this area is rare, and prior to this season, no cyclones had developed in it since 2003.[84]
Retirement
At the 12th meeting of the RA V Tropical Cyclone Committee in Niue in July 2008, it was decided that the name Guba was retired from the TCWC Port Moresbys Naming lists this season as TCWC Port Moresby uses names only once and then they are retired. The name Malia was promoted from the standby list to replace the name Guba. The name Auram was added to the standby list inplace of Malia. [85]
It was also decided that the 3 Australian Bureau of Meteorology Naming lists would be merged into one main one list to be used within the whole of the Bureau of Meteorology's Area of responsibilty from the start of the 2008-09 Tropical Cyclone Year. As a Consequence off all the names being revised the names that were used this season were removed from the current list. [86]
See also
References
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- ^ http://img175.imageshack.us/img175/3108/tropicaldisturbance16rrc9.jpg
- ^ a b c d e "Monthly Global Tropical Cyclone Summary". Gary Padgett. Retrieved on 04-07-2008.
- ^ http://www.webcitation.org/5TAuMTWMe
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- ^ http://www.webcitation.org/5TAuS3oNN JTWC Advisory 2
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- ^ Tropical Cyclone Formation Alert. Joint Typhoon Warning Center (November 13, 2007). Retrieved on November 15, 2007.
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- ^ "At least 150 dead in PNG floods", BBC, November 21, 2007. Retrieved on November 21, 2007.
- ^ a b Australian Associated Press (2007). "Guba kills three in Papua New Guinea". Retrieved on 2007-11-16.
- ^ "At least 71 dead in PNG floods say officials", Agence France-Presse, November 19, 2007. Retrieved on November 19, 2007.
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- ^ "Cyclone Guba stews under southery drift", Brisbane Times, November 15, 2007. Retrieved on November 16, 2007.
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