Tropical Cyclone Ilsa
● 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).
Ilsa at 1999-12-09 08:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为Category 2 Tropical Cyclone , max wind 约 30.9 m/s (1 分钟平均) , minimum central pressure 980 hPa, at 1999-12-17 20:00:00前后结束, total 记录 35 track points (6 h一个) . 曾Landfall或贴近land.
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1999-12-09 08:00 | -9.0°S, 95.2°E | Tropical Depression | 13.9 | 1002 |
| 1999-12-09 20:00 | -9.1°S, 96.3°E | Tropical Depression | 13.9 | 1002 |
| 1999-12-10 08:00 | -9.3°S, 97.4°E | Tropical Depression | 10.3 | 1001 |
| 1999-12-10 20:00 | -9.8°S, 98.4°E | Tropical Depression | 12.9 | 997 |
| 1999-12-11 08:00 | -10.5°S, 99.7°E | Tropical Depression | 15.4 | 993 |
| 1999-12-11 20:00 | -11.2°S, 100.9°E | Category 1 Tropical Cyclone | 20.6 | 985 |
| 1999-12-12 08:00 | -11.9°S, 102.1°E | Category 1 Tropical Cyclone | 20.6 | 980 |
| 1999-12-12 20:00 | -12.3°S, 103.0°E | Category 1 Tropical Cyclone | 23.1 | 985 |
| 1999-12-13 08:00 | -12.4°S, 104.3°E | Category 1 Tropical Cyclone | 25.7 | 986 |
| 1999-12-13 20:00 | -12.4°S, 105.8°E | Category 2 Tropical Cyclone | 28.3 | 990 |
| 1999-12-14 08:00 | -12.2°S, 107.5°E | Category 2 Tropical Cyclone | 28.3 | 990 |
| 1999-12-14 20:00 | -12.1°S, 109.4°E | Category 2 Tropical Cyclone | 28.3 | 990 |
| 1999-12-15 08:00 | -12.2°S, 111.3°E | Category 2 Tropical Cyclone | 28.3 | 990 |
| 1999-12-15 20:00 | -12.9°S, 113.5°E | Category 2 Tropical Cyclone | 30.9 | 990 |
| 1999-12-16 08:00 | -15.0°S, 116.0°E | Category 2 Tropical Cyclone | 30.9 | 992 |
| 1999-12-16 20:00 | -17.2°S, 118.5°E | Category 1 Tropical Cyclone | 23.1 | 994 |
| 1999-12-17 08:00 | -19.1°S, 120.0°E | Category 2 Tropical Cyclone | 28.3 | 994 |
| 1999-12-17 20:00 | -20.7°S, 121.7°E | Tropical Depression | 15.4 | 995 |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1999343S09095 / SH012000. There is no official Chinese name for this storm in the basin, so the original English name is used. Intensity is classified by the local agency in the basin, converted from 1-minute sustained wind using the WMO factor, and is for reference only. Data notes · Incorrect translation?
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