For other tropical cyclones of the same name, see Tropical Storm Ilsa.
Not to be confused with Tropical Storm Isa or Hurricane Elsa.
Severe Tropical Cyclone Ilsa
Ilsa near peak intensity while approaching Western Australia on 13 April
Meteorological history
Formed
6 April 2023 (2023-04-06)
Dissipated
15 April 2023 (2023-04-15)
Category 5 severe tropical cyclone
10-minute sustained (Aus)
Highest winds
230 km/h (145 mph)
Highest gusts
325 km/h (200 mph)
Lowest pressure
915 hPa (mbar); 27.02 inHg
Category 5-equivalent tropical cyclone
1-minute sustained (SSHWS/JTWC)
Highest winds
260 km/h (160 mph)
Lowest pressure
919 hPa (mbar); 27.14 inHg
Overall effects
Fatalities
8
Damage
A$4 million
Areas affected
Maluku, Lesser Sunda Islands, Northern Territory, Western Australia
Part of the 2022–23 Australian region cyclone season
Severe Tropical Cyclone Ilsa was a powerful tropical cyclone that struck Western Australia in April 2023. The sixth named storm, and the fifth severe tropical cyclone of the 2022–23 Australian region cyclone season, Ilsa formed from a tropical low off the coast of Indonesia on 6 April. It fluctuated in intensity and became a Category 1 tropical cyclone on 11 April, after deep convection became symmetric around the low-level circulation center. Ilsa then rapidly intensified the following day and reached its peak intensity as a Category 5 severe tropical cyclone on the Australian tropical cyclone intensity scale. Ten-minute sustained winds were estimated as 230 km/h (145 mph), with a central barometric pressure of 915 hPa (27.02 inHg). One-minute sustained winds reached 260 km/h (160 mph) at this time, equivalent to a Category 5 hurricane on the Saffir–Simpson hurricane wind scale. Additionally, record-breaking ten-minute sustained wind speed of 219 km/h (136 mph) were measured at Bedout Island, beating the previous record of Cyclone George in 2007. Ilsa made landfall roughly 120 km (75 mi) northeast of Port Hedland, Western Australia. Inland, Ilsa weakened to a low-end tropical cyclone with 85 km/h (50 mph) winds. Overall, Ilsa caused around A$4 million in damage, and caused 8 deaths after two boats capsized off the coast of Western Australia.
Severe Tropical CycloneIlsa was a powerful tropical cyclone that struck Western Australia in April 2023. The sixth named storm, and the fifth severe tropical...
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