Tropical Cyclone Billy
● Data reliability: ReliableWeather satellites monitored it throughout, so its track and intensity are relatively accurate (Atlantic and E. Pacific since 1966, other basins since 1980).
Billy at 2008-12-16 08:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Category 4 tropical cyclone , max wind 约 56.6 m/s (1 分钟平均) , minimum central pressure 950 hPa, at 2009-01-04 08:00:00前后结束, total 记录 77 track points (6 h一个) . 曾Landfall或贴近land.
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 2008-12-16 08:00 | -10.6°S, 127.7°E | Tropical Depression | 8.2 | 1004 |
| 2008-12-17 08:00 | -12.3°S, 127.3°E | Tropical Depression | 11.3 | 1002 |
| 2008-12-18 08:00 | -13.7°S, 128.3°E | Tropical Depression | 12.9 | 996 |
| 2008-12-19 08:00 | -14.6°S, 128.7°E | Category 1 Tropical Cyclone | 23.1 | 988 |
| 2008-12-20 08:00 | -14.9°S, 127.9°E | Tropical Depression | 18 | 993 |
| 2008-12-21 08:00 | -15.2°S, 126.1°E | Tropical Depression | 12.9 | 998 |
| 2008-12-22 08:00 | -15.6°S, 124.5°E | Category 1 Tropical Cyclone | 20.6 | 995 |
| 2008-12-23 08:00 | -17.2°S, 122.2°E | Category 1 Tropical Cyclone | 20.6 | 989 |
| 2008-12-24 08:00 | -17.8°S, 119.9°E | Category 3 tropical cyclone | 38.6 | 976 |
| 2008-12-25 08:00 | -17.5°S, 117.3°E | Category 4 tropical cyclone | 54 | 955 |
| 2008-12-26 08:00 | -16.2°S, 114.8°E | Category 3 tropical cyclone | 43.7 | 964 |
| 2008-12-27 08:00 | -15.3°S, 113.3°E | Category 2 Tropical Cyclone | 28.3 | 981 |
| 2008-12-28 08:00 | -15.0°S, 112.9°E | Category 1 Tropical Cyclone | 20.6 | 995 |
| 2008-12-29 08:00 | -16.5°S, 111.3°E | Tropical Depression | 12.9 | 998 |
| 2008-12-30 08:00 | -16.9°S, 108.1°E | Tropical Depression | 12.9 | 998 |
| 2008-12-31 08:00 | -16.4°S, 106.2°E | Tropical Depression | 10.3 | 1002 |
| 2009-01-01 08:00 | -15.1°S, 102.4°E | Tropical Depression | 10.3 | 1002 |
| 2009-01-02 08:00 | -14.3°S, 98.3°E | Tropical Depression | 10.3 | 1004 |
| 2009-01-03 08:00 | -13.1°S, 93.2°E | Tropical Depression | 10.3 | 1004 |
| 2009-01-04 08:00 | -12.4°S, 89.0°E | Tropical Disturbance | 7.7 | 1010 |
Data sources: NOAA National Environmental Information Center IBTrACS v04r01 (Knapp et al., 2010), code 2008351S11128 / SH052009. There is no official Chinese name for this basin, so the original English name is used. Intensity categories follow the classifications of the regional agency based on 1-min sustained winds converted using the WMO factor, for reference only. Data notes · Incorrect translation?
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