Storm Activity: Aug 19, 1999 - Aug 25, 1999
Aug 25 · 09:00 GMT -- 1,012 mb Extratropical
| Aug 25 | 09:00 GMT | 43.43 | -178.74 | -- | 1,012 mb | Extratropical | -- |
| Aug 25 | 06:00 GMT | 43.5 | 178.9 | -- | 1,012 mb | Extratropical | -- |
| Aug 25 | 03:00 GMT | 43.53 | 176.5 | -- | 1,012 mb | Extratropical | -- |
| Aug 25 | 00:00 GMT | 43.6 | 174.1 | -- | 1,012 mb | Extratropical | -- |
| Aug 24 | 21:00 GMT | 43.97 | 171.73 | -- | 1,012 mb | Extratropical | -- |
| Aug 24 | 18:00 GMT | 44 | 169.3 | -- | 1,012 mb | Extratropical | -- |
| Aug 24 | 15:00 GMT | 43 | 166.66 | -- | 1,013 mb | Tropical Depression | -- |
| Aug 24 | 12:00 GMT | 41.8 | 164.4 | -- | 1,014 mb | Tropical Depression | -- |
| Aug 24 | 09:00 GMT | 41.25 | 162.85 | -- | 1,014 mb | Tropical Depression | -- |
| Aug 24 | 06:00 GMT | 40.9 | 161.7 | -- | 1,014 mb | Tropical Depression | -- |
| Aug 24 | 03:00 GMT | 40.41 | 160.6 | -- | 1,014 mb | Tropical Depression | -- |
| Aug 24 | 00:00 GMT | 39.9 | 159.7 | -- | 1,014 mb | Tropical Depression | -- |
| Aug 23 | 21:00 GMT | 39.37 | 158.89 | -- | 1,013 mb | Tropical Depression | -- |
| Aug 23 | 18:00 GMT | 38.8 | 158.3 | -- | 1,012 mb | Tropical Depression | -- |
| Aug 23 | 15:00 GMT | 38.14 | 157.94 | -- | 1,013 mb | Tropical Depression | -- |
| Aug 23 | 12:00 GMT | 37.5 | 157.8 | -- | 1,014 mb | Tropical Depression | -- |
| Aug 23 | 09:00 GMT | 36.98 | 157.77 | -- | 1,013 mb | Tropical Depression | -- |
| Aug 23 | 06:00 GMT | 36.5 | 157.9 | -- | 1,012 mb | Tropical Depression | -- |
| Aug 23 | 03:00 GMT | 35.99 | 158.1 | -- | 1,011 mb | Tropical Depression | -- |
| Aug 23 | 00:00 GMT | 35.5 | 158.5 | -- | 1,010 mb | Tropical Depression | -- |
| Aug 22 | 21:00 GMT | 35.03 | 159.16 | -- | 1,009 mb | Tropical Storm | -- |
| Aug 22 | 18:00 GMT | 34.6 | 159.9 | 40 mph | 1,008 mb | Tropical Storm | -- |
| Aug 22 | 15:00 GMT | 34.23 | 160.51 | 45 mph | 1,007 mb | Tropical Storm | -- |
| Aug 22 | 12:00 GMT | 33.9 | 161.1 | 45 mph | 1,006 mb | Tropical Storm | -- |
| Aug 22 | 09:00 GMT | 33.54 | 161.68 | 50 mph | 1,005 mb | Tropical Storm | -- |
| Aug 22 | 06:00 GMT | 33.2 | 162.3 | 50 mph | 1,004 mb | Tropical Storm | -- |
| Aug 22 | 03:00 GMT | 32.88 | 163.03 | 50 mph | 1,004 mb | Tropical Storm | -- |
| Aug 22 | 00:00 GMT | 32.6 | 163.8 | 50 mph | 1,004 mb | Tropical Storm | -- |
| Aug 21 | 21:00 GMT | 32.38 | 164.56 | 50 mph | 1,004 mb | Tropical Storm | -- |
| Aug 21 | 18:00 GMT | 32.2 | 165.3 | 50 mph | 1,004 mb | Tropical Storm | -- |
| Aug 21 | 15:00 GMT | 32 | 165.99 | 55 mph | 1,002 mb | Severe Tropical Storm | -- |
| Aug 21 | 12:00 GMT | 31.8 | 166.7 | 60 mph | 1,000 mb | Severe Tropical Storm | -- |
| Aug 21 | 09:00 GMT | 31.59 | 167.49 | 60 mph | 1,000 mb | Severe Tropical Storm | -- |
| Aug 21 | 06:00 GMT | 31.4 | 168.3 | 60 mph | 1,000 mb | Severe Tropical Storm | -- |
| Aug 21 | 03:00 GMT | 31.26 | 169.08 | 55 mph | 1,002 mb | Tropical Storm | -- |
| Aug 21 | 00:00 GMT | 31.1 | 169.9 | 50 mph | 1,004 mb | Tropical Storm | -- |
| Aug 20 | 21:00 GMT | 30.86 | 170.79 | 50 mph | 1,006 mb | Tropical Storm | -- |
| Aug 20 | 18:00 GMT | 30.6 | 171.7 | 45 mph | 1,008 mb | Tropical Storm | -- |
| Aug 20 | 15:00 GMT | 30.38 | 172.57 | 45 mph | 1,009 mb | Tropical Storm | -- |
| Aug 20 | 12:00 GMT | 30.2 | 173.4 | 40 mph | 1,010 mb | Tropical Storm | -- |
| Aug 20 | 09:00 GMT | 30.08 | 174.22 | 40 mph | 1,010 mb | Tropical Storm | -- |
| Aug 20 | 06:00 GMT | 30 | 175 | 40 mph | 1,010 mb | Tropical Storm | -- |
| Aug 20 | 03:00 GMT | 29.89 | 175.72 | -- | 1,012 mb | Tropical Depression | -- |
| Aug 20 | 00:00 GMT | 29.8 | 176.4 | -- | 1,014 mb | Tropical Depression | -- |
| Aug 19 | 21:00 GMT | 29.74 | 177.12 | -- | 1,015 mb | Tropical Depression | -- |
| Aug 19 | 18:00 GMT | 29.7 | 177.8 | -- | 1,016 mb | Tropical Depression | -- |
| Aug 19 | 15:00 GMT | 29.65 | 178.42 | -- | 1,016 mb | Tropical Depression | -- |
| Aug 19 | 12:00 GMT | 29.6 | 179 | -- | 1,016 mb | Tropical Depression | -- |
Learn more about Tropical Storm Tanya and the 1999 Western Pacific hurricane season in our hurricane archive.
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