The 2020-21 Australian Region Cyclone Season was a near average season with 9 named storms and 15 Tropical lows, 2 of these became severe tropical cyclones, those being Dianne and Frances. The cyclones caused more deaths and damage then predicted. Everything is measured is measured in Australian.

Seasonal Forecasts

Source Date Tropical

storms

Cyclones Severe

Cyclones

BOM October 15, 2017 14 10 1
-
Actual activity 15 9 2


Storms

Storms
TL 01U
C2 Zane
TL 03U
TL 04U
C1 Alfred
TL 06U
C2 Bianca
C2 Caleb
C4 Dianne
C2 Edna
C5 Frances
TL 12U
C1 Grant
C2 Hilda
TL 15U
2020-21 Australian Region Cyclone season
Seasonal boundaries
First system formedDecember 16, 2017
Last system dissipatedMay 1, 2018
Strongest storm
NameFrances
 • Maximum winds280 km/h (175 mph)
(1-minute sustained)
 • Lowest pressure911 hPa (mbar)
Seasonal statistics
Tropical lows15
Tropical cyclones9
Severe tropical cyclones2
Total fatalities155 total
Total damage$698.1 million (2017 USD)
Australian region tropical cyclone seasons
2017–18, 2019–20, 2020–21, 2021–22, 2022–23

The 2020–21 Australian Region Cyclone Season is the period of the year when most tropical cyclones form within the Southern Indian Ocean and Pacific Oceans between 90°E and 160°E. The season officially ran from November 1, 2020 to April 30, 2021, however a tropical cyclone could form at any time between July 1, 2020 and June 30, 2021 and would count towards the season total. During the season, tropical cyclones will be officially monitored, by one of the five Tropical Cyclone Warning Centres (TCWCs, Which are Perth TCWC, Darwin TCWC, Brisbane TCWC, Port Moresby TCWC and Jakarta TCWC) that are operated in this region.

Timeline

wikipedia:Tropical cyclone scales#Comparisons across basins

Tropical Low 01U

Tropical Low 1
Tropical low (Aus scale)
Tropical storm (SSHWS)
15U 2017-02-07 0240Z.jpg
FormedDecember 16, 2020
DissipatedDecember 19, 2020
Highest winds10-minute sustained: 60 km/h (40 mph)
3-minute sustained: 75 km/h (45 mph)
1-minute sustained:
85 km/h (50 mph)
Gusts: 95 km/h (60 mph)
Lowest pressure997 hPa (mbar); 29.44 inHg
FatalitiesN/A
DamageN/A
Areas affectedWestern Australia
Part of the 2017-18 Australian Region Cyclone Season

Tropical Cyclone Zane

Tropical Cyclone Zane
Category 2 tropical cyclone (Aus scale)
Category 1 tropical cyclone (SSHWS)
Dylan Jan 30 2014 0350Z.jpg
FormedDecember 20, 2020
DissipatedDecember 26, 2020
Highest winds10-minute sustained: 100 km/h (65 mph)
3-minute sustained: 115 km/h (75 mph)
1-minute sustained:
125 km/h (80 mph)
Gusts: 140 km/h (85 mph)
Lowest pressure977 hPa (mbar); 28.85 inHg
Fatalities3 Total
Damage$1 million (2017 USD)
Areas affectedQueensland
Part of the 2017-18 Australian Region Cyclone Season

Tropical Low 03U

Tropical Low 2
Tropical low (Aus scale)
Tropical storm (SSHWS)
Aus TL Jan 17 2014 0135Z.jpg
FormedDecember 30, 2020
DissipatedJanuary 1, 2021
Highest winds10-minute sustained: 55 km/h (35 mph)
3-minute sustained: 70 km/h (45 mph)
1-minute sustained:
80 km/h (50 mph)
Gusts: 100 km/h (65 mph)
Lowest pressure998 hPa (mbar); 29.47 inHg
FatalitiesN/A
DamageN/A
Areas affectedNorthern Territory
Part of the 2017-18 Australian Region Cyclone Season

Tropical Low 04U

Tropical Low 04U
Tropical low (Aus scale)
Tropical storm (SSHWS)
Caleb 2017-03-23 0700Z.jpg
FormedJanuary 8, 2021
DissipatedJanuary 10, 2021
Highest winds10-minute sustained: 45 km/h (30 mph)
3-minute sustained: 55 km/h (35 mph)
1-minute sustained:
75 km/h (45 mph)
Gusts: 85 km/h (50 mph)
Lowest pressure1000 hPa (mbar); 29.53 inHg
FatalitiesN/A
DamageN/A
Areas affectedN/A
Part of the 2017-18 Australian Region Cyclone Season

Tropical Cyclone Alfred

Tropical Cyclone Alfred
Category 1 tropical cyclone (Aus scale)
Tropical storm (SSHWS)
Tatiana 2016-02-11 0310Z (Original).jpg
FormedJanuary 13, 2021
DissipatedJanuary 20, 2021
Highest winds10-minute sustained: 85 km/h (50 mph)
3-minute sustained: 95 km/h (60 mph)
1-minute sustained:
110 km/h (70 mph)
Gusts: 130 km/h (80 mph)
Lowest pressure983 hPa (mbar); 29.03 inHg
FatalitiesN/A
DamageN/A
Areas affectedN/A
Part of the 2017-18 Australian Region Cyclone Season

Tropical Low 06U

Tropical Low 06U
Tropical low (Aus scale)
Tropical storm (SSHWS)
Fletcher Feb 3 2014 0040Z.jpg
FormedJanuary 25, 2021
DissipatedJanuary 28, 2021
Highest winds10-minute sustained: 55 km/h (35 mph)
3-minute sustained: 65 km/h (40 mph)
1-minute sustained:
80 km/h (50 mph)
Gusts: 100 km/h (65 mph)
Lowest pressure997 hPa (mbar); 29.44 inHg
Fatalities2 Total
Damage$0.3 million (2017 USD)
Areas affectedQueensland
Part of the 2017-18 Australian Region Cyclone Season

Tropical Cyclone Bianca

Tropical Cyclone Bianca
Category 2 tropical cyclone (Aus scale)
Category 1 tropical cyclone (SSHWS)
Stan Jan 30 2016 0605Z.jpg
FormedFebruary 1, 2021
DissipatedFebruary 8, 2021
Highest winds10-minute sustained: 100 km/h (65 mph)
3-minute sustained: 115 km/h (75 mph)
1-minute sustained:
135 km/h (85 mph)
Gusts: 150 km/h (90 mph)
Lowest pressure977 hPa (mbar); 28.85 inHg
Fatalities5 Total
Damage$1 million (2017 USD)
Areas affectedWestern Australia
Part of the 2017-18 Australian Region Cyclone Season

Tropical Cyclone Caleb

Tropical Cyclone Caleb
Category 2 tropical cyclone (Aus scale)
Category 1 tropical cyclone (SSHWS)
Alessia Nov 27 2013 0100Z.jpg
FormedFebruary 13, 2021
DissipatedFebruary 18, 2021
Highest winds10-minute sustained: 105 km/h (65 mph)
3-minute sustained: 120 km/h (75 mph)
1-minute sustained:
140 km/h (85 mph)
Gusts: 155 km/h (100 mph)
Lowest pressure976 hPa (mbar); 28.82 inHg
Fatalities4 Total
Damage$2.3 million (2017 USD)
Areas affectedNorthern Territory
Part of the 2017-18 Australian Region Cyclone Season

Severe Tropical Cyclone Dianne

Severe Tropical Cyclone Dianne
Category 4 severe tropical cyclone (Aus scale)
Category 3 tropical cyclone (SSHWS)
Cyclone Yasi 2 February 2011 approaching Queensland.jpg
FormedFebruary 24, 2021
DissipatedMarch 5, 2021
Highest winds10-minute sustained: 180 km/h (110 mph)
3-minute sustained: 195 km/h (120 mph)
1-minute sustained:
205 km/h (125 mph)
Gusts: 225 km/h (140 mph)
Lowest pressure934 hPa (mbar); 27.58 inHg
Fatalities57 Total
Damage$456.6 million (2017 USD)
Areas affectedQueensland
Part of the 2017-18 Australian Region Cyclone Season

Tropical Cyclone Edna

Tropical Cyclone Edna
Category 2 tropical cyclone (Aus scale)
Tropical storm (SSHWS)
Hadi Mar 10 2014 0355Z.jpg
FormedMarch 14, 2021
DissipatedMarch 21, 2021
Highest winds10-minute sustained: 95 km/h (60 mph)
3-minute sustained: 100 km/h (65 mph)
1-minute sustained:
110 km/h (70 mph)
Gusts: 130 km/h (80 mph)
Lowest pressure979 hPa (mbar); 28.91 inHg
Fatalities3 Total
Damage$0.1 million (2017 USD)
Areas affectedQueensland
Part of the 2017 Australian Region Cyclone Season

Severe Tropical Cyclone Frances

Severe Tropical Cyclone Frances
Category 5 severe tropical cyclone (Aus scale)
Category 5 tropical cyclone (SSHWS)
STC Gwenda 06 apr 1999 0832Z.jpg
FormedMarch 16, 2021
DissipatedMarch 27, 2021
Highest winds10-minute sustained: 260 km/h (160 mph)
3-minute sustained: 270 km/h (165 mph)
1-minute sustained:
280 km/h (175 mph)
Gusts: 295 km/h (185 mph)
Lowest pressure911 hPa (mbar); 26.9 inHg
Fatalities76 Total
Damage$234.8 million (2017 USD)
Areas affectedWestern Australia
Part of the 2017-18 Australian Region Cyclone Season

Tropical Low 12U

Tropical Low 12U
Tropical low (Aus scale)
Tropical storm (SSHWS)
17S 07 feb 2008 0330Z.jpg
FormedApril 2, 2021
DissipatedApril 5, 2021
Highest winds10-minute sustained: 55 km/h (35 mph)
3-minute sustained: 65 km/h (40 mph)
1-minute sustained:
85 km/h (50 mph)
Gusts: 95 km/h (60 mph)
Lowest pressure998 hPa (mbar); 29.47 inHg
FatalitiesN/A
DamageN/A
Areas affectedN/A
Part of the 2017-18 Australian Region Cyclone Season

Tropical Cyclone Grant

Tropical Cyclone Grant
Category 1 tropical cyclone (Aus scale)
Tropical storm (SSHWS)
Cyclone Isa (Spcardzo).jpg
FormedApril 5, 2021
DissipatedApril 11, 2021
Highest winds10-minute sustained: 85 km/h (50 mph)
3-minute sustained: 100 km/h (65 mph)
1-minute sustained:
110 km/h (70 mph)
Gusts: 130 km/h (80 mph)
Lowest pressure986 hPa (mbar); 29.12 inHg
Fatalities3 Total
Damage$0.9 million (2017 USD)
Areas affectedNorthern Territory
Part of the 2017-18 Australian Region Cyclone Season

Tropical Cyclone Hilda

Tropical Cyclone Hilda
Category 2 tropical cyclone (Aus scale)
Category 1 tropical cyclone (SSHWS)
Cyclone Jasmine Feb 3 2012.jpg
FormedApril 18, 2021
DissipatedApril 26, 2021
Highest winds10-minute sustained: 100 km/h (65 mph)
3-minute sustained: 110 km/h (70 mph)
1-minute sustained:
120 km/h (75 mph)
Gusts: 140 km/h (85 mph)
Lowest pressure978 hPa (mbar); 28.88 inHg
Fatalities2 Total
Damage$1.1 million (2017 USD)
Areas affectedNew Caledonia
Part of the 2017-18 Australian Region Cyclone Season

Tropical Low 15U

Tropical Low 15U
Tropical low (Aus scale)
Tropical storm (SSHWS)
Raquel 2015-06-30 2340Z.jpeg.jpeg
FormedApril 28, 2021
DissipatedMay 1, 2021
Highest winds10-minute sustained: 45 km/h (30 mph)
3-minute sustained: 55 km/h (35 mph)
1-minute sustained:
65 km/h (40 mph)
Gusts: 85 km/h (50 mph)
Lowest pressure1000 hPa (mbar); 29.53 inHg
FatalitiesN/A
DamageN/A
Areas affectedN/A
Part of the 2017 Australian Region Cyclone Season

Accumulated Cyclone Energy (ACE) Rating

ACE (104 kt2) = Storm: Source
1 31.17 Frances 8 0.00 Storm
2 28.27 Dianne 9 0.00 Storm
3 15.79 Caleb 10 0.00 Storm
4 14.62 Zane 11

0.00

Storm
5 14.45 Bianca 12

0.00

Storm
6 14.37 Hilda 13

0.00

Storm
7 9.66 Alfred 14

0.00 Storm

8 9.50 Grant 15

0.00 Storm

9 4.22 01U 16

0.00 Storm

10 3.66 03U 17

0.00 Storm

11 3.57 12U 18

0.00 Storm

11 3.09 04U 19

0.00 Storm

12 2.99 15U 20

0.00 Storm

Total=122.46

Seasonal Effects

2016-17 Australian Region Cyclone Season statistics
Storm
name
Dates active Storm category

at peak intensity

Max 1-min
wind
mph (km/h)
Min.
press.
(mbar)
Areas affected Damage
(USD)
Deaths


01U December 16 - December 19 Tropical storm 40 (60) 997 Western Australia (Pilbara) minimal none
Zane December 20 -December 26 Category 2 hurricane 65 (100) 977 Queensland (Central Coast) 1 million 3
03U December 30 - January 1 Tropical storm 35 (55) 998 Northern Territory (Top End) minimal none
04U January 8 - January 10 Tropical storm 30 (45) 1000 none minimal none
Alfred January 13 - January 20 Category 1 hurricane 50 (85) 983 none minimal none
06U January 25 - January 28 Tropical storm 35 (55) 997 Queensland (Central Coast) 0.3 million 2
Bianca February 1 - February 8 Category 2 hurricane 65 (100) 977 Western Australia (Pilbara) 1 million 5
Caleb February 13 - February 18 Category 2 hurricane 65 (105) 976 Northern Territory (Top End) 2.3 million 4
Dianne February 24 - March 5 Category 4 hurricane 110 (180) 934 Queensland (North Tropical Coast) 456.6 million 57
Edna March 14 - March 21 Category 2 hurricane 60 (95) 979 Queensland (Central Coast) 0.1 million 3
Frances March 16 - March 27 Category 5 hurricane 160 (260) 911 Western Australia (Pilbara) 234.8 million 76
12U April 2 - April 5 Tropical storm 35 (55) 998 none minimal none
Grant April 5 - April 11 Category 1 hurricane 50 (85) 986 Northern Territory (Top End) 0.9 million 3
Hilda April 18 - April 26 Category 2 hurricane 65 (100) 978 New Caledonia 1.1 million 2
15U April 28 - May 1 Tropical storm 30 (45) 1000 none minimal none
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