Storm Activity: Aug 18, 1973 - Aug 22, 1973
Aug 22 · 06:00 GMT -- 998 mb Extratropical
| Aug 22 | 06:00 GMT | 20.6 | 107.2 | -- | 998 mb | Extratropical | -- |
| Aug 22 | 03:00 GMT | 20.54 | 107.69 | -- | 998 mb | Extratropical | -- |
| Aug 22 | 00:00 GMT | 20.6 | 108.3 | -- | 998 mb | Extratropical | -- |
| Aug 21 | 21:00 GMT | 20.82 | 109.08 | -- | 998 mb | Extratropical | -- |
| Aug 21 | 18:00 GMT | 21 | 109.9 | -- | 998 mb | Extratropical | -- |
| Aug 21 | 15:00 GMT | 20.91 | 110.61 | -- | 998 mb | Extratropical | -- |
| Aug 21 | 12:00 GMT | 20.8 | 111.2 | -- | 998 mb | Extratropical | -- |
| Aug 21 | 09:00 GMT | 20.85 | 111.59 | -- | 998 mb | Extratropical | -- |
| Aug 21 | 06:00 GMT | 21 | 112 | -- | 998 mb | Extratropical | -- |
| Aug 21 | 03:00 GMT | 21.23 | 112.66 | -- | 998 mb | Extratropical | -- |
| Aug 21 | 00:00 GMT | 21.4 | 113.5 | -- | 998 mb | Extratropical | -- |
| Aug 20 | 21:00 GMT | 21.35 | 114.5 | -- | 998 mb | Extratropical | -- |
| Aug 20 | 18:00 GMT | 21.2 | 115.5 | -- | 998 mb | Extratropical | -- |
| Aug 20 | 15:00 GMT | 21 | 116.29 | -- | 998 mb | Extratropical | -- |
| Aug 20 | 12:00 GMT | 20.9 | 117 | -- | 998 mb | Extratropical | -- |
| Aug 20 | 09:00 GMT | 21.16 | 117.7 | -- | 997 mb | Extratropical | -- |
| Aug 20 | 06:00 GMT | 21.4 | 118.5 | -- | 996 mb | Extratropical | -- |
| Aug 20 | 03:00 GMT | 21.23 | 119.54 | -- | 995 mb | Unknown | -- |
| Aug 20 | 00:00 GMT | 21 | 120.6 | -- | 994 mb | Unknown | -- |
| Aug 19 | 21:00 GMT | 21 | 121.49 | -- | 993 mb | Unknown | -- |
| Aug 19 | 18:00 GMT | 21.1 | 122.3 | -- | 992 mb | Unknown | -- |
| Aug 19 | 15:00 GMT | 21.23 | 123.09 | -- | 993 mb | Unknown | -- |
| Aug 19 | 12:00 GMT | 21.3 | 123.8 | -- | 994 mb | Unknown | -- |
| Aug 19 | 09:00 GMT | 21.18 | 124.44 | -- | 995 mb | Tropical Depression | -- |
| Aug 19 | 06:00 GMT | 21 | 125 | -- | 996 mb | Tropical Depression | -- |
| Aug 19 | 03:00 GMT | 20.91 | 125.5 | -- | 997 mb | Tropical Depression | -- |
| Aug 19 | 00:00 GMT | 20.8 | 126 | -- | 998 mb | Tropical Depression | -- |
| Aug 18 | 21:00 GMT | 20.53 | 126.58 | -- | 999 mb | Tropical Depression | -- |
| Aug 18 | 18:00 GMT | 20.3 | 127.2 | -- | 1,000 mb | Tropical Depression | -- |
| Aug 18 | 15:00 GMT | 20.27 | 127.84 | -- | 1,001 mb | Tropical Depression | -- |
| Aug 18 | 12:00 GMT | 20.3 | 128.5 | -- | 1,002 mb | Tropical Depression | -- |
| Aug 18 | 09:00 GMT | 20.26 | 129.16 | -- | 1,002 mb | Tropical Depression | -- |
| Aug 18 | 06:00 GMT | 20.2 | 129.8 | -- | 1,002 mb | Tropical Depression | -- |
| Aug 18 | 03:00 GMT | 20.11 | 130.41 | -- | 1,002 mb | Tropical Depression | -- |
| Aug 18 | 00:00 GMT | 20 | 131 | -- | 1,002 mb | Tropical Depression | -- |
Learn more about Tropical Depression Joan and the 1973 Western Pacific hurricane season in our hurricane archive.
View All Hurricanes and Tropical Cyclones