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2021–22 Australian region cyclone season

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2021–22 Australian region cyclone season
Season summary map
Seasonal boundaries
First system formed9 November 2021
Last system dissipatedSeason ongoing
Strongest storm
NamePaddy
 • Maximum winds75 km/h (45 mph)
(10-minute sustained)
 • Lowest pressure992 hPa (mbar)
Seasonal statistics
Tropical lows4
Tropical cyclones2
Severe tropical cyclones0
Total fatalitiesNone
Total damageNone
Related articles
Australian region tropical cyclone seasons
2019–20, 2020–21, 2021–22, 2022–23, 2023–24

The 2021–22 Australian region cyclone season is the period of the year when most tropical cyclones form in the Southern Indian Ocean and Pacific Oceans between 90°E and 160°E. The current season began from 1 November 2021 and will end on 30 April 2022, however, a tropical cyclone could form at any time between 1 July 2021 and 30 June 2022 and would count towards the season total. During the season, tropical cyclones will be officially monitored by one of the three tropical cyclone warning centres (TCWCs) for the region which are operated by the Australian Bureau of Meteorology, National Weather Service of Papua New Guinea and the Indonesian Agency for Meteorology, Climatology and Geophysics. The United States Joint Typhoon Warning Center (JTWC) and other national meteorological services including Météo-France and the Fiji Meteorological Service will also monitor the basin during the season.

Season summary

Tropical cyclone scales#Comparisons across basins

A tropical low developed to the north of the Western Region on 9 November, starting the season and the overall Southern Hemisphere season as well. After passing near the Cocos Islands with rainfall, it exiting the basin into the South-West Indian Ocean region on 14 November. Three days later, Tropical Low 02U formed near the Christmas Island and later became Tropical Cyclone Paddy, the first named cyclone in this season. On 22 November Tropical Low 03U formed.

Systems

Tropical Cyclone Paddy

Category 1 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
 
Duration17 November – 23 November
Peak intensity75 km/h (45 mph) (10-min);
992 hPa (mbar)

On 16 November, the BoM first highlighted a possibility of another weak tropical low near or due west of Christmas Island. The agency also noted that this system may bring heavy rainfall to the island.[1] This became true when on the next day, the bureau noted that Tropical Low 02U developed from a trough at 100 kilometres (62 mi) to the northwest of the aforementioned territory under the influence of the weak Madden–Julian Oscillation in the basin.[2][3][4] On the next day, it became slow-moving as it meandered near the territory before resuming its movement eastwards to southeast.[5][6] On 21 November of 04:00 UTC, the JTWC issued a Tropical Cyclone Formation Alert (TCFA) for Invest 90S which the agency was tracking very recently.[7] By 03:00 UTC of 22 November, the BoM upgraded the tropical low to a Category 1 tropical cyclone on the Australian scale and named it Paddy, becoming the first named cyclone in this season.[8][9] The JTWC later did the same thing at 09:00 UTC.[10]

At this time, it started to incline south-southeastwards with its pressure bottoming to 997 mbar (29.44 inHg). Three hours later, the BoM noted that Paddy continued to organize, with gale-force winds circling along its western and southern sides, according to scatterometer passes. The agency also nudged the system's intensity to 40 kn (75 km/h; 45 mph), which would eventually be Paddy's eventual maximum 10-minute sustained winds. Sea surface temperatures around 28 °C (82 °F), low wind shear and favorable upper-level divergence were the factors behind Paddy's intensification.[11] Convection started to decrease by 12:00 UTC; however, it managed to maintain its sustained wind speed as Paddy turned towards the south.[12] Early on the next day, dry air started to affect the storm, leading to Paddy's further disorganization as the system turned west-southwestwards and southwestwards.[13] As it moved west-northwestwards, it started to weaken and as it turned further westwards by 18:00 UTC of 23 November, the BoM issued its final warning as Paddy weakened into a tropical low.[14][15] On the next day the JTWC issued a final warning.[16]

Tropical Cyclone Teratai

Tropical Low 05U
Current storm status
Tropical low cyclone (Australian scale)
Current storm status
Tropical storm (1-min mean)
Satellite image
Forecast map
As of:14:00 AWST (06:00 UTC), 1 December
Location:9°24′S 102°30′E / 9.4°S 102.5°E / -9.4; 102.5 (Tropical Low 05U) ± 30 nautical miles
About 370 km (230 mi) WNW of Christmas Island
About 690 km (430 mi) ENE of Cocos Island
Sustained winds:35 kn (65 km/h; 40 mph) (10-min mean)
gusting to 50 kn (95 km/h; 60 mph)
35 kn (65 km/h; 40 mph) (1-min mean)
Pressure:1000 hPa (29.53 inHg)
Movement:S at 6 kn (10 km/h; 5 mph)
See latest official information.

On 29 November BoM predicted a formation of a tropical low which they designated as 05U.[17] On the next day, 05U formed which was located adjoining regions to the Christmas Island and the island of Java.[18] At 23:30 UTC of the same day, the JTWC issued a TCFA for the system as the agencies found that the convection in associated with the system had increased.[19]

Current storm information

As of 14:00 AWST (06:00 UTC) 1 December, Tropical Low 05U is located within 30 nautical miles of 9°24′S 102°30′E / 9.4°S 102.5°E / -9.4; 102.5 (05U), which is approximately about 370 km (230 mi) west-northwest of Christmas Island and about 690 km (430 mi) east-northeast of Cocos Island. Maximum 10-minute sustained winds are at 35 kn (65 km/h; 40 mph), gusting up to 50 kn (95 km/h; 60 mph). while maximum 1-minute sustained winds are at 35 knots (65 km/h; 40 mph) The minimum barometric pressure is 1000 hPa (29.53 inHg) and the system moving south at 6 kn (10 km/h; 5 mph).

For latest official information see:

Other systems

Tropical Low 03U on 22 November 2021

The Australian Bureau of Meteorology first noted the formation of a possible low-pressure system to the southwest of the island of Sumatra by 4 November.[20] This forecast was materialized when the BoM started to track a weak tropical low outside the Western Region on 9 November, while located at 400 kilometres (250 mi) to the north-northeast of the Cocos Islands.[21] It then entered the region by the next day while tracking slowly towards the island. Environmental conditions were analysed to be unfavorable for further development and as such, the BoM only forecasted a "very low" chance of the low becoming a tropical cyclone.[22] The tropical low then passed to the south of the archipelago before turning westwards and exiting the basin into the South-West Indian Ocean region by 14 November.[23][24][25]

On 22 November, a weak tropical low formed north of the Western Region, which was designated as 03U.[26] By 24 November, the tropical low had entered the region and was located 560 kilometres (350 mi) west-northwest of the Cocos Islands.[27] It meandered near the Cocos Islands, before moving westwards and exited the basin on 28 November.[28]

Storm names

Bureau of Meteorology

The Australian Bureau of Meteorology (TCWC Melbourne) monitors all tropical cyclones that form within the Australian region, including any within the areas of responsibility of TCWC Jakarta or TCWC Port Moresby.[29] Should a tropical low reach tropical cyclone strength within the TCWC Melbourne's area of responsibility, it will be assigned the next name from the following naming list. The next 12 names are listed below:

  • Paddy
  • Ruby (unused)
  • Seth (unused)
  • Tiffany (unused)
  • Vernon (unused)
  • Anika (unused)
  • Billy (unused)
  • Charlotte (unused)
  • Darian (unused)
  • Ellie (unused)
  • Freddy (unused)
  • Gabrielle (unused)

TCWC Jakarta

TCWC Jakarta monitors Tropical Cyclones from the Equator to 11S and from 90E to 145E. Should a Tropical Depression reach Tropical Cyclone strength within TCWC Jakarta's Area of Responsibility then it will be assigned the next name from the following list.[29] The next six names on the naming list are listed below.

  • Teratai (unused)
  • Anggrek (unused)
  • Bakung (unused)
  • Cempaka (unused)
  • Dahlia (unused)
  • Flamboyan (unused)

TCWC Port Moresby

Tropical cyclones that develop north of 11°S between 151°E and 160°E are assigned names by the Tropical Cyclone Warning Centre in Port Moresby, Papua New Guinea. Tropical cyclone formation in this area is rare, with no cyclones being named in it since 2007.[30]

  • Hibu (unused)
  • Ila (unused)
  • Kama (unused)
  • Lobu (unused)
  • Maila (unused)
  • Alu (unused)
  • Buri (unused)
  • Dodo (unused)
  • Emau (unused)
  • Fere (unused)

Season effects

2021–22 Australian region cyclone season
Name Dates Peak intensity Areas affected Damage
(US$) 		Deaths
Category Wind speed
(km/h (mph)) 		Pressure
(hPa)
TL 9–14 Nov Tropical low Not specified 1006 None None 0
Paddy 17–23 Nov Category 1 tropical cyclone 75 (45) 992 Christmas Island None 0
03U 22–28 Nov Tropical low Not specified 1006 None None 0
05U 30 Nov – Present Tropical low 65 (40) 1000 None None 0
Season aggregates
4 systems 9 Nov – Present 75 (45) 992 Unknown 0

See also

References

  1. ^ "Tropical Cyclone Outlook for the Western Region issued at 2:00 pm WST on Tuesday, 16 November 2021 for the period until 12:00 am WST Friday, 19 November 2021". Australian Bureau of Meteorology. 16 November 2021. Archived from the original on 17 November 2021. Retrieved 17 November 2021.
  2. ^ "Tropical Cyclone Outlook for the Western Region issued at 2:00 pm WST on Wednesday, 17 November 2021 for the period until 12:00 am WST Saturday, 20 November 2021". Australian Bureau of Meteorology. 17 November 2021. Archived from the original on 17 November 2021. Retrieved 17 November 2021.
  3. ^ "Christmas Island Forecast, Issued at 5:30 am WST on Wednesday 17 November 2021". Australian Bureau of Meteorology. 17 November 2021. Archived from the original on 17 November 2021. Retrieved 17 November 2021.
  4. ^ "Tropical Climate Update, Issued at 16 November 2021 and Valid until 30 November 2021". Australian Bureau of Meteorology. 16 November 2021. Archived from the original on 17 November 2021. Retrieved 17 November 2021.
  5. ^ "Tropical Cyclone Outlook for the Western Region issued at 2:00 pm WST on Thursday, 18 November 2021 for the period until 12:00 am WST Sunday, 21 November 2021". Australian Bureau of Meteorology. 18 November 2021. Archived from the original on 18 November 2021. Retrieved 18 November 2021.
  6. ^ "Tropical Cyclone Outlook for the Western Region issued at 2:00 pm WST on Saturday, 20 November 2021 for the period until 12:00 am WST Tuesday, 23 November 2021". Australian Bureau of Meteorology. 18 November 2021. Archived from the original on 20 November 2021. Retrieved 18 November 2021.
  7. ^ Tropical Cyclone Formation Alert (Invest 90S) (Report). United States Joint Typhoon Warning Center. 21 November 2021. Archived from the original on 22 November 2021. Retrieved 22 November 2021.
  8. ^ "Tropical Cyclone Information Bulletin issued at 12:07 p.m WST on Monday, 22 November 2021". Australian Bureau of Meteorology. 22 November 2021. Archived from the original on 22 November 2021. Retrieved 22 November 2021.
  9. ^ "Updated Tropical Cyclone Outlook for the Western Region issued at 12:26 pm WST on Monday, 22 November 2021 for the period until 00:00 WST Thursday, 25 November 2021". Australian Bureau of Meteorology. 22 November 2021. Archived from the original on 22 November 2021. Retrieved 22 November 2021.
  10. ^ Prognostic Reasoning for Tropical Cyclone 01S (Paddy) Warning No. 1 (Report). United States Joint Typhoon Warning Center. 22 November 2021. Archived from the original on 22 November 2021. Retrieved 22 November 2021.
  11. ^ "Tropical Cyclone Technical Bulletin for Tropical Cyclone Paddy, Issued at 07:26 UTC of 22 November 2021". Australian Bureau of Meteorology. 22 November 2021. Archived from the original on 22 November 2021. Retrieved 24 November 2021.
  12. ^ "Tropical Cyclone Technical Bulletin for Tropical Cyclone Paddy, Issued at 19:08 UTC of 22 November 2021". Australian Bureau of Meteorology. 22 November 2021. Archived from the original on 22 November 2021. Retrieved 24 November 2021.
  13. ^ "Tropical Cyclone Technical Bulletin for Tropical Cyclone Paddy, Issued at 00:55 UTC of 23 November 2021". Australian Bureau of Meteorology. 23 November 2021. Archived from the original on 23 November 2021. Retrieved 24 November 2021.
  14. ^ "Tropical Cyclone Technical Bulletin for Tropical Cyclone Paddy, Issued at 19:19 UTC of 23 November 2021". Australian Bureau of Meteorology. 23 November 2021. Archived from the original on 23 November 2021. Retrieved 24 November 2021.
  15. ^ "Updated Tropical Cyclone Outlook for the Western Region Issued at 12:48 WST on Wednesday, 24 November 2021, for the period until 00:00 WST of Saturday, 27 November 2021". Australian Bureau of Meteorology. 24 November 2021. Archived from the original on 24 November 2021. Retrieved 24 November 2021.
  16. ^ Tropical Cyclone 01S (Paddy) Warning No. 10 (Report). United States Joint Typhoon Warning Center. 24 November 2021. Archived from the original on 24 November 2021. Retrieved 24 November 2021.
  17. ^ "Tropical Cyclone Outlook for the Western Region Issued at 2:00 pm WST on Monday 29 November 2021 for the period until midnight WST Thursday 2 December 2021". Australian Bureau of Meteorology. 29 November 2021. Archived from the original on 30 November 2021. Retrieved 30 November 2021.
  18. ^ "Tropical Cyclone Outlook for the Western Region, issued at 14:00 WST on Tuesday, 30 November 2021 for the period until 00:00 WST Friday, 3 December 2021". Australian Bureau of Meteorology. 30 November 2021. Archived from the original on 30 November 2021. Retrieved 30 November 2021.
  19. ^ Tropical Cyclone Formation Alert (Invest 92S) (Report). United States Joint Typhoon Warning Center. 30 November 2021. Archived from the original on 30 November 2021. Retrieved 1 December 2021.
  20. ^ "Tropical Cyclone Outlook for the Western Region issued at 2:00 pm WST on Thursday, 4 November 2021 for the period until 12:00 am WST Sunday, 7 November 2021". Australian Bureau of Meteorology. 4 November 2021. Archived from the original on 10 November 2021. Retrieved 10 November 2021.
  21. ^ "Tropical Cyclone Outlook for the Western Region issued at 12:07 pm WST on Tuesday, 9 November 2021 for the period until 12:00 am WST Friday, 12 November 2021". Australian Bureau of Meteorology. 9 November 2021. Archived from the original on 9 November 2021. Retrieved 10 November 2021.
  22. ^ "Tropical Cyclone Outlook for the Western Region issued at 2:00 pm WST on Wednesday, 10 November 2021 for the period until 12:00 am WST Saturday, 13 November 2021". Australian Bureau of Meteorology. 10 November 2021. Archived from the original on 10 November 2021. Retrieved 10 November 2021.
  23. ^ "Tropical Cyclone Outlook for the Western Region issued at 2:00 pm WST on Thursday, 11 November 2021 for the period until 12:00 am WST Sunday, 14 November 2021". Australian Bureau of Meteorology. 11 November 2021. Archived from the original on 12 November 2021. Retrieved 14 November 2021.
  24. ^ "Tropical Cyclone Outlook for the Western Region issued at 2:00 pm WST on Saturday, 13 November 2021 for the period until 12:00 am WST Tuesday, 16 November 2021". Australian Bureau of Meteorology. 13 November 2021. Archived from the original on 14 November 2021. Retrieved 14 November 2021.
  25. ^ "Asia MSL Pressure Analysis for 14 November 2021, Valid 00UTC". Australian Bureau of Meteorology. 14 November 2021. Archived from the original on 14 November 2021. Retrieved 14 November 2021.
  26. ^ "Updated Tropical Cyclone Outlook for the Western Region issued at 12:26 WST on Monday, 22 November 2021 for the period until 00:00 WST Thursday, 25 November 2021". Australian Bureau of Meteorology. 22 November 2021. Archived from the original on 22 November 2021. Retrieved 22 November 2021.
  27. ^ "Updated Tropical Cyclone Outlook for the Western Region issued at 12:48 WST on Monday, 24 November 2021 for the period until 00:00 WST Thursday, 26 November 2021". Australian Bureau of Meteorology. 24 November 2021. Archived from the original on 24 November 2021. Retrieved 24 November 2021.
  28. ^ "Updated Tropical Cyclone Outlook for the Western Region issued at 14:08 WST on Monday, 28 November 2021 for the period until 00:00 WST Thursday, 1 December 2021". Australian Bureau of Meteorology. 28 November 2021. Archived from the original on 29 November 2021. Retrieved 29 November 2021.
  29. ^ a b RA V Tropical Cyclone Committee (2023). Tropical Cyclone Operational Plan for the South-East Indian Ocean and the Southern Pacific Ocean 2023 (PDF) (Report). World Meteorological Organization. Retrieved October 23, 2023.
  30. ^ Gary Padgett (2008). "Monthly Global Tropical Cyclone Summary October". Australian Severe Weather. Retrieved 2013-07-01.
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