The SummaryTyphoon Ann (international code 199911) is a 1999 Northwest Pacific typhoon; peak intensity Tropical Storm, max wind 23m/s, minimum central pressure 985hPa, not in China Landfall, 1999-09-20 was numbered off, recording 22 track points.
Typhoon Ann, international code 199911, international name ANN, 1999 Northwest Pacific typhoon. Formed: 1999-09-15 00:00:00, ended: 1999-09-20 06:00:00. Peak intensity: Tropical Storm, minimum central pressure: 985 hPa, max wind: 23m/s.
Typhoon Ann at 1999-09-15 00:00:00 at 26.5°N, 129.4°E over the Northwest Pacific; initial intensity: Nameless.
It peaked at Tropical Storm intensity with max winds of 23 m/s (~83 km/h) and a minimum central pressure of 985hPa, recorded at 1999-09-17 12:00:00.
1999-09-20 06:00:00 After, Typhoon Ann gradually weakened and was numbered off on 1999-09-20 06:00:00 was numbered off; its lifecycle recorded 22 track points.
Typhoon Ann (199911)'s life began at 15 September 1999 at 00, initial Position position at lat 26.5°N, near 129.4°. In the formed early, the system showed a noticeable toward NWTrend, from 15 September at 00 to 18 pm, the latitude from 26.5°N rapidly N raised to 28.8°N, the length slowly W shift.
值得注意的是, 该Typhoon 在9月16日至9月18日期间, The latitude变化相对平缓, 主要沿纬 toward toward W推进, 横穿E海中部海域. 9月18日12时后, 随着纬度再次快速N抬 (从31.3°N增至9月20日的34.7°N) , 路径出现明显的NE toward 转折, 最终 at 9月20日06时在较高纬度海域减弱消散. 整个生命周期内, Typhoon Ann未Landfall任何陆地, 始终在海上活动.
从Intensity变化来看, Ann经历了一个典型的“增强-维持-减弱”过程. formed初期为Nameless, max wind 仅7m/s. 经过约30h的加强, at 9月16日06时升级为Tropical Storm, max wind 达到20m/s. 此后Intensity继续缓慢攀升, 在9月17日12时达到巅峰状态, max wind 为23m/s, 并在此Intensity上维持了约36h (至9月18日18时) .
Starting at 00:00 on September 19, affected by high-latitude environmental factors, the system began to weaken, wind speed dropped to 20m/s, and at 06:00 on the same day re-degreeed to Nameless.
| Time | The latitude | During | Intensity | Wind (m/s) | Pressure (hPa) | Moving toward |
|---|---|---|---|---|---|---|
| 1999-09-15 00:00:00 | 26.5°N | 129.4°E | Nameless | 7 | 1004 | |
| 1999-09-15 06:00:00 | 26.8°N | 129.4°E | Nameless | 10 | 1002 | |
| 1999-09-15 12:00:00 | 27.4°N | 129.3°E | Nameless | 10 | 1002 | |
| 1999-09-15 18:00:00 | 28.8°N | 129°E | Nameless | 15 | 998 | |
| 1999-09-16 00:00:00 | 29.5°N | 128.1°E | Nameless | 15 | 994 | |
| 1999-09-16 06:00:00 | 29.6°N | 127.3°E | Tropical Storm | 20 | 985 | |
| 1999-09-16 12:00:00 | 29.5°N | 127°E | Tropical Storm | 20 | 985 | |
| 1999-09-16 18:00:00 | 29.6°N | 126.5°E | Tropical Storm | 20 | 985 | |
| 1999-09-17 00:00:00 | 29.6°N | 126.1°E | Tropical Storm | 20 | 985 | |
| 1999-09-17 06:00:00 | 29.7°N | 125.7°E | Tropical Storm | 20 | 985 | |
| 1999-09-17 12:00:00 | 29.8°N | 125.3°E | Tropical Storm | 23 | 985 | |
| 1999-09-17 18:00:00 | 30°N | 124.7°E | Tropical Storm | 23 | 990 | |
| 1999-09-18 00:00:00 | 30.3°N | 124.3°E | Tropical Storm | 23 | 990 | |
| 1999-09-18 06:00:00 | 30.7°N | 124°E | Tropical Storm | 23 | 990 | |
| 1999-09-18 12:00:00 | 31.3°N | 123.2°E | Tropical Storm | 23 | 992 | |
| 1999-09-18 18:00:00 | 31.9°N | 122.3°E | Tropical Storm | 23 | 992 | |
| 1999-09-19 00:00:00 | 32.6°N | 121.9°E | Tropical Storm | 20 | 996 | |
| 1999-09-19 06:00:00 | 33.8°N | 122.3°E | Nameless | 17 | 996 | |
| 1999-09-19 12:00:00 | 34.2°N | 123.2°E | Nameless | 17 | 998 | |
| 1999-09-19 18:00:00 | 34.4°N | 124.4°E | Nameless | 12 | 1000 | |
| 1999-09-20 00:00:00 | 34.6°N | 125.6°E | Nameless | 12 | 1002 | |
| 1999-09-20 06:00:00 | 34.7°N | 126.4°E | Nameless | 10 | - |
Typhoon Ann's international code is 199911, is 1999 number 11 Typhoon, international name ANN.
Typhoon Ann peak intensity is Tropical Storm, max wind 23m/s, minimum central pressure 985 hPa.
According to records, Typhoon Ann is not in our coastal landfall.
TyphoonSays (taifengshuo.com) provides typhoon Ann's Track history map, multinational weather agency Forecast comparison, windshield range with IntensityTrend, page address: https://taifengshuo.com/typhoon/199911.
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