Storm Activity: Jul 19, 1977 - Jul 27, 1977
Jul 27 · 00:00 GMT -- 998 mb Tropical Depression
| Jul 27 | 00:00 GMT | 31.1 | 116 | -- | 998 mb | Tropical Depression | -- |
| Jul 26 | 21:00 GMT | 30.51 | 116.05 | -- | 998 mb | Tropical Depression | -- |
| Jul 26 | 18:00 GMT | 30 | 116.2 | -- | 998 mb | Tropical Depression | -- |
| Jul 26 | 15:00 GMT | 29.61 | 116.54 | -- | 998 mb | Tropical Depression | -- |
| Jul 26 | 12:00 GMT | 29.2 | 117 | -- | 998 mb | Tropical Depression | -- |
| Jul 26 | 09:00 GMT | 28.58 | 117.49 | -- | 998 mb | Tropical Depression | -- |
| Jul 26 | 06:00 GMT | 28 | 118 | -- | 998 mb | Tropical Depression | -- |
| Jul 26 | 03:00 GMT | 27.72 | 118.55 | -- | 998 mb | Tropical Depression | -- |
| Jul 26 | 00:00 GMT | 27.5 | 119 | -- | 998 mb | Tropical Depression | -- |
| Jul 25 | 21:00 GMT | 27.14 | 119.21 | -- | 997 mb | Tropical Depression | -- |
| Jul 25 | 18:00 GMT | 26.7 | 119.3 | -- | 996 mb | Tropical Depression | -- |
| Jul 25 | 15:00 GMT | 26.23 | 119.39 | -- | 994 mb | Tropical Storm | -- |
| Jul 25 | 12:00 GMT | 25.7 | 119.5 | 50 mph | 992 mb | Tropical Storm | -- |
| Jul 25 | 09:00 GMT | 25.19 | 119.75 | 55 mph | 986 mb | Severe Tropical Storm | -- |
| Jul 25 | 06:00 GMT | 24.5 | 120 | 60 mph | 980 mb | Severe Tropical Storm | -- |
| Jul 25 | 03:00 GMT | 23.36 | 120.17 | 65 mph | 972 mb | Severe Tropical Storm | -- |
| Jul 25 | 00:00 GMT | 22.3 | 120.2 | 70 mph | 965 mb | Severe Tropical Storm | -- |
| Jul 24 | 21:00 GMT | 21.9 | 120.02 | 75 mph | 962 mb | Typhoon | 1 |
| Jul 24 | 18:00 GMT | 21.7 | 119.8 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 24 | 15:00 GMT | 21.32 | 119.76 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 24 | 12:00 GMT | 20.9 | 119.8 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 24 | 09:00 GMT | 20.47 | 119.81 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 24 | 06:00 GMT | 20.1 | 119.9 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 24 | 03:00 GMT | 19.88 | 120.16 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 24 | 00:00 GMT | 19.7 | 120.5 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 23 | 21:00 GMT | 19.45 | 120.83 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 23 | 18:00 GMT | 19.2 | 121.2 | 80 mph | 960 mb | Typhoon | 1 |
| Jul 23 | 15:00 GMT | 19 | 121.64 | 80 mph | 957 mb | Typhoon | 1 |
| Jul 23 | 12:00 GMT | 18.8 | 122.1 | 80 mph | 955 mb | Typhoon | 1 |
| Jul 23 | 09:00 GMT | 18.56 | 122.55 | 80 mph | 952 mb | Typhoon | 1 |
| Jul 23 | 06:00 GMT | 18.3 | 123 | 80 mph | 950 mb | Typhoon | 1 |
| Jul 23 | 03:00 GMT | 18.06 | 123.47 | 75 mph | 955 mb | Typhoon | 1 |
| Jul 23 | 00:00 GMT | 17.8 | 123.9 | 75 mph | 960 mb | Typhoon | 1 |
| Jul 22 | 21:00 GMT | 17.48 | 124.21 | 75 mph | 965 mb | Typhoon | 1 |
| Jul 22 | 18:00 GMT | 17.2 | 124.5 | 75 mph | 970 mb | Typhoon | 1 |
| Jul 22 | 15:00 GMT | 17.08 | 124.88 | 70 mph | 972 mb | Severe Tropical Storm | -- |
| Jul 22 | 12:00 GMT | 17 | 125.3 | 65 mph | 975 mb | Severe Tropical Storm | -- |
| Jul 22 | 09:00 GMT | 16.87 | 125.75 | 60 mph | 980 mb | Severe Tropical Storm | -- |
| Jul 22 | 06:00 GMT | 16.7 | 126.2 | 60 mph | 985 mb | Severe Tropical Storm | -- |
| Jul 22 | 03:00 GMT | 16.5 | 126.63 | 60 mph | 985 mb | Severe Tropical Storm | -- |
| Jul 22 | 00:00 GMT | 16.3 | 127 | 60 mph | 985 mb | Severe Tropical Storm | -- |
| Jul 21 | 21:00 GMT | 16.13 | 127.27 | 55 mph | 987 mb | Tropical Storm | -- |
| Jul 21 | 18:00 GMT | 16 | 127.5 | 50 mph | 990 mb | Tropical Storm | -- |
| Jul 21 | 15:00 GMT | 15.91 | 127.71 | 50 mph | 991 mb | Tropical Storm | -- |
| Jul 21 | 12:00 GMT | 15.8 | 128 | 50 mph | 992 mb | Tropical Storm | -- |
| Jul 21 | 09:00 GMT | 15.56 | 128.46 | -- | 996 mb | Tropical Depression | -- |
| Jul 21 | 06:00 GMT | 15.3 | 129 | -- | 1,000 mb | Tropical Depression | -- |
| Jul 21 | 03:00 GMT | 15.12 | 129.5 | -- | 1,002 mb | Tropical Depression | -- |
| Jul 21 | 00:00 GMT | 15 | 130 | -- | 1,004 mb | Tropical Depression | -- |
| Jul 20 | 21:00 GMT | 14.94 | 130.5 | -- | 1,004 mb | Tropical Depression | -- |
| Jul 20 | 18:00 GMT | 14.9 | 131 | -- | 1,004 mb | Tropical Depression | -- |
| Jul 20 | 15:00 GMT | 14.82 | 131.5 | -- | 1,004 mb | Tropical Depression | -- |
| Jul 20 | 12:00 GMT | 14.7 | 132 | -- | 1,004 mb | Tropical Depression | -- |
| Jul 20 | 09:00 GMT | 14.51 | 132.5 | -- | 1,004 mb | Tropical Depression | -- |
| Jul 20 | 06:00 GMT | 14.3 | 133 | -- | 1,004 mb | Tropical Depression | -- |
| Jul 20 | 03:00 GMT | 14.17 | 133.46 | -- | 1,005 mb | Tropical Depression | -- |
| Jul 20 | 00:00 GMT | 14 | 134 | -- | 1,006 mb | Tropical Depression | -- |
| Jul 19 | 21:00 GMT | 13.7 | 134.71 | -- | 1,006 mb | Tropical Depression | -- |
| Jul 19 | 18:00 GMT | 13.3 | 135.5 | -- | 1,006 mb | Tropical Depression | -- |
| Jul 19 | 15:00 GMT | 12.86 | 136.33 | -- | 1,006 mb | Tropical Depression | -- |
| Jul 19 | 12:00 GMT | 12.4 | 137 | -- | 1,006 mb | Tropical Depression | -- |
| Jul 19 | 09:00 GMT | 12.05 | 137.27 | -- | 1,006 mb | Tropical Depression | -- |
| Jul 19 | 06:00 GMT | 11.6 | 137.4 | -- | 1,006 mb | Tropical Depression | -- |
| Jul 19 | 03:00 GMT | 10.88 | 137.65 | -- | 1,007 mb | Tropical Depression | -- |
| Jul 19 | 00:00 GMT | 10 | 138 | -- | 1,008 mb | Tropical Depression | -- |
Learn more about Typhoon Thelma and the 1977 Western Pacific hurricane season in our hurricane archive.
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