No, Ilsa is no longer active. It dissipated or transitioned into an extratropical cyclone on 2023-04-15T06:00:00.000Z.
Ilsa formed on 2023-04-05T12:00:00.000Z and dissipated on 2023-04-15T06:00:00.000Z, reaching a peak intensity of tropical_depression.
Ilsa achieved maximum sustained winds of approximately 259 km/h (140 kt / 161 mph) and a minimum central pressure of approximately 920 hPa.
According to current forecasts, Ilsa is expected to pass approximately 106 km from Port Hedland, presenting a moderate risk of wind and rain impacts.
According to current forecasts, Ilsa is expected to pass approximately 281 km from Darwin, presenting a moderate risk of wind and rain impacts.
Projected rainfall totals of approximately 150-300 mm (6-12 inches) may occur in affected areas, creating risks of flash flooding and urban flooding.
Yes. Tropical systems carry abundant moisture, and outer rainbands can trigger flash flooding, river flooding, and urban flooding.
Adjust preparations based on the storm category and official advice. Secure outdoor items, prepare emergency supplies, keep backup power available, and follow official advisories.
Evacuation decisions must strictly follow official directives issued by local emergency management agencies. If an evacuation order is issued, evacuate immediately using designated routes. Do not rely solely on a single forecast model.
StormAtlas regularly updates based on publicly available data from international meteorological agencies. The latest data update was at August 12, 2026 at 08:15 PM.
Ilsa developed over warm ocean waters under conditions of high atmospheric moisture and low vertical wind shear.
The forecast path integrates data from multiple international meteorological agencies and numerical weather prediction models (such as NHC, JMA, JTWC, and CMA) using ensemble forecasting methods to generate probabilistic forecast tracks.
Storm Timeline
Ilsa at 22.9°S, 132.9°E as Tropical Depression with winds of 43 km/h (27 mph)
Ilsa at 23.0°S, 131.7°E as Tropical Depression with winds of 50 km/h (31 mph)
Ilsa at 23.0°S, 130.5°E as Tropical Depression with winds of 43 km/h (27 mph)
Ilsa at 22.9°S, 129.4°E as Tropical Depression with winds of 61 km/h (38 mph)
Ilsa at 22.7°S, 128.4°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 22.4°S, 127.2°E as Tropical Storm with winds of 72 km/h (45 mph)
Ilsa at 22.2°S, 126.0°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 22.1°S, 124.7°E as Tropical Storm with winds of 101 km/h (63 mph)
Ilsa at 22.0°S, 123.4°E as Tropical Storm with winds of 83 km/h (52 mph)
Ilsa at 21.8°S, 122.3°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Ilsa at 21.4°S, 121.3°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Ilsa at 21.0°S, 120.5°E as Category 2 (equivalent to Category 2 Hurricane) with winds of 162 km/h (101 mph)
Ilsa at 20.4°S, 120.0°E as Category 3 (equivalent to Category 3 Hurricane) with winds of 202 km/h (126 mph)
Ilsa at 20.1°S, 119.6°E as Category 4 (equivalent to Category 4 Hurricane) with winds of 230 km/h (143 mph)
Ilsa at 19.9°S, 119.5°E as Category 4 (equivalent to Category 4 Hurricane) with winds of 216 km/h (134 mph)
Ilsa at 19.5°S, 119.1°E as Category 4 (equivalent to Category 4 Hurricane) with winds of 230 km/h (143 mph)
Ilsa at 19.1°S, 118.8°E as Category 5 (equivalent to Category 5 Hurricane) with winds of 259 km/h (161 mph)
Ilsa at 18.8°S, 118.7°E as Category 3 (equivalent to Category 3 Hurricane) with winds of 202 km/h (126 mph)
Ilsa at 18.3°S, 118.8°E as Category 4 (equivalent to Category 4 Hurricane) with winds of 216 km/h (134 mph)
Ilsa at 17.8°S, 119.0°E as Category 3 (equivalent to Category 3 Hurricane) with winds of 184 km/h (114 mph)
Ilsa at 17.4°S, 119.0°E as Category 3 (equivalent to Category 3 Hurricane) with winds of 194 km/h (121 mph)
Ilsa at 17.1°S, 119.1°E as Category 2 (equivalent to Category 2 Hurricane) with winds of 166 km/h (103 mph)
Ilsa at 16.6°S, 119.4°E as Category 2 (equivalent to Category 2 Hurricane) with winds of 169 km/h (105 mph)
Ilsa at 16.3°S, 119.6°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 148 km/h (92 mph)
Ilsa at 16.1°S, 119.7°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 148 km/h (92 mph)
Ilsa at 16.0°S, 119.8°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Ilsa at 15.8°S, 119.8°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 133 km/h (83 mph)
Ilsa at 15.6°S, 119.9°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 119 km/h (74 mph)
Ilsa at 15.5°S, 120.0°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Ilsa at 15.5°S, 120.2°E as Tropical Storm with winds of 101 km/h (63 mph)
Ilsa at 15.4°S, 120.3°E as Category 1 (equivalent to Category 1 Hurricane) with winds of 130 km/h (81 mph)
Ilsa at 15.2°S, 120.6°E as Tropical Storm with winds of 90 km/h (56 mph)
Ilsa at 14.7°S, 121.0°E as Tropical Storm with winds of 115 km/h (71 mph)
Ilsa at 14.3°S, 121.4°E as Tropical Storm with winds of 72 km/h (45 mph)
Ilsa at 14.1°S, 121.4°E as Tropical Storm with winds of 90 km/h (56 mph)
Ilsa at 14.0°S, 121.5°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 13.8°S, 121.8°E as Tropical Storm with winds of 79 km/h (49 mph)
Ilsa at 13.6°S, 122.2°E as Tropical Storm with winds of 72 km/h (45 mph)
Ilsa at 13.4°S, 122.7°E as Tropical Storm with winds of 72 km/h (45 mph)
Ilsa at 13.2°S, 123.1°E as Tropical Storm with winds of 72 km/h (45 mph)
Ilsa at 13.0°S, 123.2°E as Tropical Storm with winds of 72 km/h (45 mph)
Ilsa at 12.9°S, 123.3°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 12.7°S, 123.6°E as Tropical Storm with winds of 72 km/h (45 mph)
Ilsa at 12.5°S, 123.9°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 12.4°S, 124.3°E as Tropical Storm with winds of 79 km/h (49 mph)
Ilsa at 12.4°S, 124.7°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 12.3°S, 125.1°E as Tropical Storm with winds of 83 km/h (52 mph)
Ilsa at 12.3°S, 125.5°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 12.2°S, 126.0°E as Tropical Storm with winds of 83 km/h (52 mph)
Ilsa at 12.0°S, 126.6°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 11.8°S, 127.1°E as Tropical Storm with winds of 83 km/h (52 mph)
Ilsa at 11.5°S, 127.5°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 11.3°S, 128.0°E as Tropical Storm with winds of 72 km/h (45 mph)
Ilsa at 11.1°S, 128.6°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 10.8°S, 128.9°E as Tropical Depression with winds of 61 km/h (38 mph)
Ilsa at 10.5°S, 129.2°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 10.2°S, 129.3°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 9.9°S, 129.5°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 9.8°S, 129.7°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 9.7°S, 129.9°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 9.5°S, 130.1°E as Tropical Depression with winds of 61 km/h (38 mph)
Ilsa at 9.3°S, 130.4°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 9.2°S, 130.4°E as Tropical Storm with winds of 65 km/h (40 mph)
Ilsa at 9.1°S, 130.5°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 9.0°S, 130.6°E as Tropical Depression with winds of 61 km/h (38 mph)
Ilsa at 9.0°S, 130.7°E as Tropical Depression with winds of 43 km/h (27 mph)
Ilsa at 8.9°S, 130.7°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 8.9°S, 130.8°E as Tropical Depression with winds of 43 km/h (27 mph)
Ilsa at 8.9°S, 130.9°E as Tropical Depression with winds of 54 km/h (34 mph)
Ilsa at 8.9°S, 131.2°E as Tropical Depression with winds of 43 km/h (27 mph)
Ilsa at 8.8°S, 131.5°E as Tropical Depression with winds of 43 km/h (27 mph)
Ilsa at 8.5°S, 131.9°E as Tropical Depression with winds of 43 km/h (27 mph)
Ilsa at 8.3°S, 132.3°E as Tropical Depression with winds of 36 km/h (22 mph)
Ilsa at 8.0°S, 132.6°E as Tropical Depression with winds of 36 km/h (22 mph)
Ilsa at 7.7°S, 132.7°E as Tropical Depression with winds of 32 km/h (20 mph)
Ilsa at 7.5°S, 132.9°E as Tropical Depression with winds of 36 km/h (22 mph)
Ilsa at 7.4°S, 133.4°E as Tropical Depression with winds of 25 km/h (16 mph)
Ilsa at 7.4°S, 134.1°E as Tropical Depression with winds of 25 km/h (16 mph)
Ilsa at 7.3°S, 134.8°E as Tropical Depression with winds of 25 km/h (16 mph)
Ilsa at 7.1°S, 135.4°E as Tropical Depression with winds of 25 km/h (16 mph)
Cyclone Ilsa: A Retrospective Analysis of the 2023 Category 5 Storm
Formation and Meteorological History
Cyclone Ilsa formed over the warm waters of the Indian Ocean northwest of Australia in mid-April 2023. The system rapidly intensified, reaching Category 5 status on the Australian tropical cyclone scale—the highest category—with sustained winds of 220 km/h (140 mph) and gusts up to 290 km/h (180 mph). The storm was fueled by sea surface temperatures exceeding 30°C (86°F) and low vertical wind shear, conditions typical of the Australian cyclone season (November to April). Ilsa made landfall on April 13, 2023, near the remote Pilbara coast of Western Australia, between De Grey and Karratha.
Impact and Damages
Australia (Primary Impact Zone)
Casualties: No direct fatalities were reported, but several injuries occurred due to flying debris and storm-related accidents.
Infrastructure: Severe damage to roads, power lines, and buildings in Port Hedland, Karratha, and surrounding mining towns. The storm destroyed the Pardoo Roadhouse, a historic landmark, and caused widespread power outages affecting thousands of residents.
Economic Loss: Estimated at over AUD 1 billion (USD 670 million), primarily from disruptions to iron ore mining operations in the Pilbara region, which accounts for a significant portion of global iron ore exports. Port Hedland, a major export hub, was forced to close for several days.
Environmental: Coastal erosion, damage to coral reefs, and saltwater intrusion into freshwater sources.
International Impacts
Indonesia: Heavy rainfall and flooding in parts of Java and Sumatra due to Ilsa's remnant moisture.
Philippines: Enhanced monsoon rains caused localized flooding in Luzon.
Global: Disruption to iron ore supply chains briefly affected global steel markets.
Government Response and Relief Efforts
Pre-landfall: The Australian Bureau of Meteorology issued timely warnings, leading to evacuations of vulnerable communities. Emergency services were pre-deployed.
Post-landfall: The Australian government declared a natural disaster in affected areas, unlocking federal assistance. The Australian Defence Force provided airlift support and supplies. Power companies worked to restore electricity within two weeks.
Recovery: Long-term rebuilding programs focused on strengthening infrastructure against future cyclones. Insurance claims exceeded AUD 500 million.
Conclusion
Cyclone Ilsa was a powerful reminder of the destructive potential of tropical cyclones in a warming climate. While Australia’s robust warning systems saved lives, the economic toll highlighted vulnerabilities in critical industries. The storm also served as a benchmark for future cyclone preparedness in the region.
