Tropical Cyclone Billy/Lila
● 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/Lila at 1986-05-04 08:00:00 (BeijingTime) 在South Indian Ocean首次被记录, peak intensity 为4级Tropical Cyclone , max wind 约 48.9 m/s (1 分钟平均) , minimum central pressure 950 hPa, at 1986-05-15 08:00:00前后结束, total 记录 45 track points (6 h一个) . 曾Landfall或贴近land.
| Time (BeijingTime) | Position | Category (local) | wind speed m/s | Pressure hPa |
|---|
| 1986-05-04 08:00 | -4.8°S, 90.2°E | Tropical Cyclone | - | - |
| 1986-05-04 20:00 | -5.7°S, 91.2°E | Tropical Depression | 12.9 | - |
| 1986-05-05 08:00 | -5.1°S, 90.3°E | Tropical Depression | 12.9 | 1001 |
| 1986-05-05 20:00 | -5.6°S, 91.5°E | Tropical Depression | 18 | 999 |
| 1986-05-06 08:00 | -6.5°S, 91.9°E | Category 1 Tropical Cyclone | 20.6 | 993 |
| 1986-05-06 20:00 | -7.5°S, 92.3°E | Category 1 Tropical Cyclone | 23.1 | 990 |
| 1986-05-07 08:00 | -8.1°S, 92.8°E | Category 1 Tropical Cyclone | 25.7 | 988 |
| 1986-05-07 20:00 | -8.7°S, 93.4°E | Category 2 Tropical Cyclone | 28.3 | 984 |
| 1986-05-08 08:00 | -9.7°S, 93.4°E | Category 2 Tropical Cyclone | 33.4 | 980 |
| 1986-05-08 20:00 | -10.9°S, 92.8°E | Category 2 Tropical Cyclone | 33.4 | 976 |
| 1986-05-09 08:00 | -12.3°S, 91.8°E | Category 2 Tropical Cyclone | 33.4 | 960 |
| 1986-05-09 20:00 | -13.7°S, 90.5°E | Category 2 Tropical Cyclone | 33.4 | 960 |
| 1986-05-10 08:00 | -15.0°S, 89.6°E | Tropical Cyclone | 38.6 | 959 |
| 1986-05-10 20:00 | -16.8°S, 89.6°E | Tropical Cyclone | 46.3 | 954 |
| 1986-05-11 08:00 | -18.6°S, 90.8°E | Category 3 tropical cyclone | 46.3 | 954 |
| 1986-05-11 20:00 | -20.2°S, 93.2°E | Category 2 Tropical Cyclone | 33.4 | 970 |
| 1986-05-12 08:00 | -21.8°S, 96.3°E | Category 1 Tropical Cyclone | 23.1 | 982 |
| 1986-05-12 20:00 | -23.6°S, 101.3°E | Category 1 Tropical Cyclone | 22.1 | 991 |
| 1986-05-13 08:00 | -26.0°S, 106.8°E | Tropical Depression | 16.5 | 996 |
| 1986-05-13 20:00 | -28.2°S, 113.3°E | Tropical Depression | 13.9 | 999 |
| 1986-05-14 08:00 | -30.1°S, 118.0°E | Tropical Depression | 13.9 | 1001 |
| 1986-05-14 20:00 | -31.1°S, 122.9°E | Tropical Depression | 13.9 | 1002 |
| 1986-05-15 08:00 | -31.7°S, 130.2°E | Tropical Depression | 13.9 | 1004 |
Data sources: NOAA National Centers for Environmental Information IBTrACS v04r01 (Knapp et al., 2010), code 1986124S05090 / SH321986. This basin has no official Chinese name, so the original English name is used. Intensity categories follow the local agency classification for the basin, converted from 1-minute sustained winds using the WMO factor, and are for reference only. Data notes · Incorrect translation?
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