Storm Activity: Sep 11, 1999 - Sep 17, 1999
Sep 17 · 06:00 GMT -- 1,008 mb Extratropical
| Sep 17 | 06:00 GMT | 39.8 | 157.3 | -- | 1,008 mb | Extratropical | -- |
| Sep 17 | 03:00 GMT | 39.74 | 156.65 | -- | 1,008 mb | Extratropical | -- |
| Sep 17 | 00:00 GMT | 39.7 | 156 | -- | 1,008 mb | Extratropical | -- |
| Sep 16 | 21:00 GMT | 39.7 | 155.32 | -- | 1,008 mb | Extratropical | -- |
| Sep 16 | 18:00 GMT | 39.7 | 154.6 | -- | 1,008 mb | Extratropical | -- |
| Sep 16 | 15:00 GMT | 39.66 | 153.82 | -- | 1,008 mb | Extratropical | -- |
| Sep 16 | 12:00 GMT | 39.6 | 153 | -- | 1,008 mb | Extratropical | -- |
| Sep 16 | 09:00 GMT | 39.51 | 152.2 | -- | 1,008 mb | Extratropical | -- |
| Sep 16 | 06:00 GMT | 39.4 | 151.3 | -- | 1,008 mb | Extratropical | -- |
| Sep 16 | 03:00 GMT | 39.32 | 150.39 | -- | 1,008 mb | Extratropical | -- |
| Sep 16 | 00:00 GMT | 39.1 | 149.1 | -- | 1,008 mb | Extratropical | -- |
| Sep 15 | 21:00 GMT | 38.55 | 147.09 | -- | 1,008 mb | Extratropical | -- |
| Sep 15 | 18:00 GMT | 37.9 | 144.9 | -- | 1,008 mb | Extratropical | -- |
| Sep 15 | 15:00 GMT | 37.45 | 143.13 | -- | 1,006 mb | Extratropical | -- |
| Sep 15 | 12:00 GMT | 37 | 141.4 | -- | 1,004 mb | Extratropical | -- |
| Sep 15 | 09:00 GMT | 36.36 | 139.56 | -- | 1,002 mb | Tropical Depression | -- |
| Sep 15 | 06:00 GMT | 35.7 | 137.6 | -- | 1,000 mb | Tropical Depression | -- |
| Sep 15 | 03:00 GMT | 35.1 | 135.5 | 40 mph | 998 mb | Tropical Storm | -- |
| Sep 15 | 01:00 GMT | 34.6 | 134.8 | 50 mph | 994 mb | Tropical Storm | -- |
| Sep 15 | 00:00 GMT | 34.4 | 134.6 | 40 mph | 994 mb | Tropical Storm | -- |
| Sep 14 | 21:00 GMT | 33.8 | 133.6 | 40 mph | 992 mb | Tropical Storm | -- |
| Sep 14 | 18:00 GMT | 33.2 | 132.6 | 40 mph | 988 mb | Tropical Storm | -- |
| Sep 14 | 17:00 GMT | 33.1 | 132.4 | 40 mph | 988 mb | Tropical Storm | -- |
| Sep 14 | 15:00 GMT | 32.6 | 132 | 40 mph | 990 mb | Tropical Storm | -- |
| Sep 14 | 12:00 GMT | 32.1 | 131.6 | 45 mph | 990 mb | Tropical Storm | -- |
| Sep 14 | 09:00 GMT | 31.7 | 131.3 | 50 mph | 985 mb | Tropical Storm | -- |
| Sep 14 | 08:00 GMT | 31.5 | 131.2 | 50 mph | 985 mb | Tropical Storm | -- |
| Sep 14 | 06:00 GMT | 31.3 | 131.2 | 50 mph | 990 mb | Tropical Storm | -- |
| Sep 14 | 03:00 GMT | 30.66 | 131.43 | -- | 992 mb | Tropical Depression | -- |
| Sep 14 | 00:00 GMT | 29.9 | 131.8 | -- | 994 mb | Tropical Depression | -- |
| Sep 13 | 21:00 GMT | 29.4 | 132.12 | -- | 997 mb | Tropical Depression | -- |
| Sep 13 | 18:00 GMT | 29 | 132.4 | -- | 1,000 mb | Tropical Depression | -- |
| Sep 13 | 15:00 GMT | 28.66 | 132.55 | -- | 1,001 mb | Tropical Depression | -- |
| Sep 13 | 12:00 GMT | 28.3 | 132.8 | -- | 1,002 mb | Tropical Depression | -- |
| Sep 13 | 09:00 GMT | 27.9 | 133.34 | -- | 1,002 mb | Tropical Depression | -- |
| Sep 13 | 06:00 GMT | 27.3 | 134.1 | -- | 1,002 mb | Tropical Depression | -- |
| Sep 13 | 03:00 GMT | 26.3 | 135.01 | -- | 1,002 mb | Tropical Depression | -- |
| Sep 13 | 00:00 GMT | 25.2 | 135.9 | -- | 1,002 mb | Tropical Depression | -- |
| Sep 12 | 21:00 GMT | 24.25 | 136.59 | -- | 1,002 mb | Tropical Depression | -- |
| Sep 12 | 18:00 GMT | 23.5 | 137.1 | -- | 1,002 mb | Tropical Depression | -- |
| Sep 12 | 15:00 GMT | 23.02 | 137.44 | -- | 1,003 mb | Tropical Depression | -- |
| Sep 12 | 12:00 GMT | 22.7 | 137.7 | -- | 1,004 mb | Tropical Depression | -- |
| Sep 12 | 09:00 GMT | 22.42 | 138 | -- | 1,004 mb | Tropical Depression | -- |
| Sep 12 | 06:00 GMT | 22.1 | 138.3 | -- | 1,004 mb | Tropical Depression | -- |
| Sep 12 | 03:00 GMT | 21.58 | 138.62 | -- | 1,004 mb | Tropical Depression | -- |
| Sep 12 | 00:00 GMT | 21 | 138.9 | -- | 1,004 mb | Tropical Depression | -- |
| Sep 11 | 21:00 GMT | 20.48 | 139.1 | -- | 1,004 mb | Tropical Depression | -- |
| Sep 11 | 18:00 GMT | 20 | 139.3 | -- | 1,004 mb | Tropical Depression | -- |
| Sep 11 | 15:00 GMT | 19.58 | 139.56 | -- | 1,005 mb | Tropical Depression | -- |
| Sep 11 | 12:00 GMT | 19.2 | 139.9 | -- | 1,006 mb | Tropical Depression | -- |
| Sep 11 | 09:00 GMT | 18.83 | 140.38 | -- | 1,006 mb | Tropical Depression | -- |
| Sep 11 | 06:00 GMT | 18.5 | 140.9 | -- | 1,006 mb | Tropical Depression | -- |
| Sep 11 | 03:00 GMT | 18.23 | 141.37 | -- | 1,006 mb | Tropical Depression | -- |
| Sep 11 | 00:00 GMT | 18 | 141.8 | -- | 1,006 mb | Tropical Depression | -- |
Learn more about Tropical Storm Zia and the 1999 Western Pacific hurricane season in our hurricane archive.
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