Cyclone Ilsa (2009)
Cyclone Ilsa reached Category 3 in the South Indian between March 15, 2009 and March 26, 2009, with a lowest pressure of 948 mb.
Track and intensity
The whole track of Cyclone Ilsa, colored by strength, with the other storms of the 2009 season in the same basin behind it, and its wind and pressure hour by hour. Every fix is in the track table below.
The storm
- Basin
- South Indian
- Dates
- March 15, 2009 to March 26, 2009
- Peak strength
- Category 3, 100 kt (115 mph)
- Lowest pressure
- 948 mb (27.99 inHg)
- Landfall
- No; closest approach 68 km (42 mi)
- Accumulated cyclone energy
- 12.9
- Tropical-storm-force wind reached
- 120 nmi (222 km, 138 mi) from the center at its widest
- Hurricane-force wind reached
- 50 nmi (93 km, 58 mi) from the center at its widest
- Eyewall radius at its peak
- 10 nmi (19 km, 12 mi)
- Overall size
- 230 nmi (426 km, 265 mi) to the outermost closed isobar
- Fastest the center moved
- 17 kt (20 mph)
- Identifier
- SH222009
Deaths and damage
No source this site reads carries a casualty or damage figure for this storm.
Track
| Time (UTC) | Position | Wind | Pressure | Status |
|---|---|---|---|---|
| Mar 15, 00:00 | 10.0S 128.7E | 20 kt | 1006 mb | Tropical storm |
| Mar 15, 06:00 | 10.2S 127.9E | 20 kt | 1006 mb | Tropical storm |
| Mar 15, 12:00 | 10.4S 126.8E | 20 kt | 1006 mb | Tropical storm |
| Mar 15, 18:00 | 10.6S 125.7E | 25 kt | 1004 mb | Tropical storm |
| Mar 16, 00:00 | 10.8S 124.6E | 25 kt | 1004 mb | Tropical storm |
| Mar 16, 06:00 | 11.2S 123.3E | 25 kt | 1004 mb | Tropical storm |
| Mar 16, 12:00 | 12.0S 122.4E | 25 kt | 1004 mb | Tropical storm |
| Mar 16, 18:00 | 12.6S 121.5E | 20 kt | 1007 mb | Disturbance |
| Mar 17, 00:00 | 12.9S 119.9E | 25 kt | 1004 mb | Tropical depression |
| Mar 17, 06:00 | 13.0S 118.3E | 25 kt | 1004 mb | Tropical depression |
| Mar 17, 12:00 | 13.5S 116.6E | 30 kt | 1000 mb | Tropical depression |
| Mar 17, 18:00 | 13.3S 114.8E | 35 kt | 996 mb | Tropical storm |
| Mar 18, 00:00 | 13.5S 113.2E | 40 kt | 993 mb | Tropical storm |
| Mar 18, 06:00 | 13.6S 111.9E | 50 kt | 985 mb | Tropical storm |
| Mar 18, 12:00 | 13.7S 110.7E | 55 kt | 982 mb | Tropical storm |
| Mar 18, 18:00 | 14.6S 109.7E | 65 kt | 974 mb | Typhoon |
| Mar 19, 00:00 | 15.4S 108.7E | 70 kt | 970 mb | Typhoon |
| Mar 19, 06:00 | 15.9S 107.6E | 85 kt | 959 mb | Typhoon |
| Mar 19, 12:00 | 16.3S 106.8E | 100 kt | 948 mb | Typhoon |
| Mar 19, 18:00 | 16.3S 105.9E | 100 kt | 948 mb | Typhoon |
| Mar 20, 00:00 | 16.2S 105.1E | 95 kt | 952 mb | Typhoon |
| Mar 20, 06:00 | 16.1S 104.4E | 95 kt | 952 mb | Typhoon |
| Mar 20, 12:00 | 16.0S 103.8E | 90 kt | 956 mb | Typhoon |
| Mar 20, 18:00 | 15.9S 103.2E | 90 kt | 956 mb | Typhoon |
| Mar 21, 00:00 | 16.0S 102.4E | 90 kt | 956 mb | Typhoon |
| Mar 21, 06:00 | 16.1S 101.6E | 85 kt | 959 mb | Tropical cyclone |
| Mar 21, 12:00 | 16.1S 100.9E | 80 kt | 963 mb | Typhoon |
| Mar 21, 18:00 | 16.1S 100.2E | 75 kt | 967 mb | Typhoon |
| Mar 22, 00:00 | 16.2S 99.5E | 70 kt | 970 mb | Typhoon |
| Mar 22, 06:00 | 16.4S 98.8E | 70 kt | 970 mb | Typhoon |
| Mar 22, 12:00 | 16.8S 97.9E | 65 kt | 974 mb | Typhoon |
| Mar 22, 18:00 | 17.1S 96.8E | 55 kt | 982 mb | Tropical storm |
| Mar 23, 00:00 | 17.3S 95.5E | 45 kt | 989 mb | Tropical storm |
| Mar 23, 06:00 | 17.6S 94.2E | 40 kt | 993 mb | Tropical storm |
| Mar 23, 12:00 | 18.2S 92.9E | 35 kt | 996 mb | Tropical storm |
| Mar 23, 18:00 | 18.6S 91.5E | 35 kt | 996 mb | Tropical storm |
| Mar 24, 00:00 | 19.2S 90.1E | 30 kt | 1000 mb | Tropical depression |
| Mar 24, 06:00 | 19.6S 88.9E | 30 kt | 1000 mb | Tropical depression |
| Mar 24, 12:00 | 20.0S 87.7E | 30 kt | 1000 mb | Tropical depression |
| Mar 24, 18:00 | 20.3S 86.1E | 25 kt | 1004 mb | Tropical depression |
| Mar 25, 00:00 | 21.0S 84.6E | 25 kt | 1004 mb | Tropical depression |
| Mar 25, 06:00 | 21.5S 83.3E | 25 kt | 1004 mb | Tropical depression |
| Mar 25, 12:00 | 22.2S 82.1E | 20 kt | 1007 mb | Disturbance |
| Mar 25, 18:00 | 23.1S 80.8E | 20 kt | 1007 mb | Disturbance |
| Mar 26, 00:00 | 23.7S 79.8E | 20 kt | 1007 mb | Disturbance |
| Mar 26, 06:00 | 24.2S 78.9E | 20 kt | 1007 mb | Disturbance |
| Mar 26, 12:00 | 24.7S 77.8E | 15 kt | 1010 mb | Disturbance |
Other South Indian storms of 2009
- Tropical Storm AsmaSouth Indian · 2009
- Tropical Storm BernardSouth Indian · 2009
- Tropical Storm AnikaSouth Indian · 2009
- Tropical Storm CindaSouth Indian · 2009
- Cyclone BillySouth Indian · 2009
- Tropical Storm DongoSouth Indian · 2009
- Tropical Storm EricSouth Indian · 2009
- Cyclone FaneleSouth Indian · 2009
- Tropical Storm DominicSouth Indian · 2009
- Cyclone GaelSouth Indian · 2009
- Tropical Storm FreddySouth Indian · 2009
- Cyclone HinaSouth Indian · 2009
- Tropical Storm GabrielleSouth Indian · 2009
- Unnamed tropical stormSouth Indian · 2009
- Cyclone IzildaSouth Indian · 2009
- Cyclone JadeSouth Indian · 2009 · 9 deaths
- Tropical Storm KirrilySouth Indian · 2009
What this means
A best track is the record a warning agency settles on after the storm, not what it said at the time: position, maximum sustained wind and central pressure every six hours, revised against every observation that came in later. Category is the Saffir-Simpson scale, which runs from Category 1 at 64 kt to Category 5 at 137 kt and reads wind only, so it says nothing about surge or rain. Accumulated cyclone energy adds up the square of the wind through the storm's life, so it counts strength and duration together.
Sources
Storm history from NOAA NCEI’s International Best Track Archive for Climate Stewardship (IBTrACS), which merges the official best track of every warning agency. Live storms, cones, watches and warnings from the National Hurricane Center and the Central Pacific Hurricane Center. Archived radar from NOAA’s Level II archive.