Cyclone Yasi (2011)
Cyclone Yasi reached Category 4 in the South Pacific between January 28, 2011 and February 6, 2011, with a lowest pressure of 922 mb, and made landfall.
Track and intensity
The whole track of Cyclone Yasi, colored by strength, with the other storms of the 2011 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 Pacific
- Dates
- January 28, 2011 to February 6, 2011
- Peak strength
- Category 4, 135 kt (155 mph)
- Lowest pressure
- 922 mb (27.23 inHg)
- Landfall
- Yes
- Accumulated cyclone energy
- 16.1
- Tropical-storm-force wind reached
- 220 nmi (407 km, 253 mi) from the center at its widest
- Hurricane-force wind reached
- 80 nmi (148 km, 92 mi) from the center at its widest
- Eyewall radius at its peak
- 10 nmi (19 km, 12 mi)
- Overall size
- 240 nmi (444 km, 276 mi) to the outermost closed isobar
- Peak gust in the best track
- 55 kt (63 mph)
- Fastest the center moved
- 29 kt (33 mph)
- Identifier
- SH112011
Deaths and damage
No source this site reads carries a casualty or damage figure for this storm.
Track
| Time (UTC) | Position | Wind | Pressure | Status |
|---|---|---|---|---|
| Jan 28, 00:00 | 13.2S 179.7E | 20 kt | 1004 mb | Not reported |
| Jan 28, 06:00 | 13.0S 179.1E | 25 kt | 1003 mb | Not reported |
| Jan 28, 12:00 | 13.8S 177.0E | 25 kt | 1003 mb | Not reported |
| Jan 28, 18:00 | 14.5S 174.1E | 25 kt | 1003 mb | Not reported |
| Jan 29, 00:00 | 14.4S 173.6E | 20 kt | 1007 mb | Tropical depression |
| Jan 29, 06:00 | 14.1S 172.9E | 25 kt | 1004 mb | Tropical depression |
| Jan 29, 12:00 | 13.9S 172.0E | 30 kt | 1000 mb | Tropical depression |
| Jan 29, 18:00 | 13.5S 171.2E | 30 kt | 1000 mb | Tropical depression |
| Jan 30, 00:00 | 13.3S 170.1E | 40 kt | 993 mb | Tropical storm |
| Jan 30, 06:00 | 13.2S 168.8E | 45 kt | 989 mb | Tropical storm |
| Jan 30, 12:00 | 13.4S 167.5E | 50 kt | 985 mb | Tropical storm |
| Jan 30, 18:00 | 13.5S 166.1E | 60 kt | 978 mb | Tropical storm |
| Jan 31, 00:00 | 13.6S 164.5E | 65 kt | 974 mb | Typhoon |
| Jan 31, 06:00 | 13.5S 162.5E | 75 kt | 967 mb | Typhoon |
| Jan 31, 12:00 | 13.5S 160.5E | 90 kt | 956 mb | Typhoon |
| Jan 31, 18:00 | 13.7S 158.5E | 90 kt | 956 mb | Typhoon |
| Feb 1, 00:00 | 14.1S 156.6E | 95 kt | 952 mb | Typhoon |
| Feb 1, 06:00 | 14.4S 154.9E | 100 kt | 948 mb | Typhoon |
| Feb 1, 12:00 | 15.0S 153.3E | 120 kt | 933 mb | Typhoon |
| Feb 1, 18:00 | 15.8S 151.6E | 125 kt | 929 mb | Typhoon |
| Feb 2, 00:00 | 16.4S 149.8E | 130 kt | 926 mb | Super typhoon |
| Feb 2, 06:00 | 17.0S 148.1E | 135 kt | 922 mb | Super typhoon |
| Feb 2, 12:00 | 17.5S 146.9E | 135 kt | 922 mb | Super typhoon |
| Feb 2, 18:00 | 18.2S 145.2E | 110 kt | 941 mb | Typhoon |
| Feb 3, 00:00 | 19.4S 143.2E | 80 kt | 963 mb | Typhoon |
| Feb 3, 06:00 | 19.9S 141.6E | 50 kt | 985 mb | Tropical storm |
| Feb 3, 12:00 | 20.4S 140.4E | 40 kt | 993 mb | Tropical storm |
| Feb 3, 18:00 | 21.0S 139.4E | 30 kt | 1000 mb | Tropical depression |
| Feb 4, 00:00 | 21.6S 138.5E | 30 kt | 1000 mb | Tropical depression |
| Feb 4, 06:00 | 22.4S 137.8E | 25 kt | 1004 mb | Tropical depression |
| Feb 4, 12:00 | 23.2S 137.0E | 25 kt | 1004 mb | Tropical depression |
| Feb 4, 18:00 | 24.2S 136.4E | 25 kt | 1004 mb | Tropical depression |
| Feb 5, 00:00 | 24.9S 135.4E | 25 kt | 1004 mb | Tropical depression |
| Feb 5, 06:00 | 25.3S 135.1E | 25 kt | 1004 mb | Tropical depression |
| Feb 5, 12:00 | 25.3S 134.5E | 25 kt | 1004 mb | Tropical depression |
| Feb 5, 18:00 | 25.1S 133.8E | 25 kt | 1004 mb | Tropical depression |
| Feb 6, 00:00 | 25.0S 132.8E | 25 kt | 1004 mb | Tropical depression |
| Feb 6, 06:00 | 24.8S 131.6E | 25 kt | 1004 mb | Tropical depression |
| Feb 6, 12:00 | 24.7S 130.9E | 25 kt | 1004 mb | Tropical depression |
| Feb 6, 18:00 | 24.7S 129.8E | 25 kt | 1004 mb | Tropical depression |
Other South Pacific storms of 2011
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.