Storm Activity: Oct 9, 1970 - Oct 18, 1970
Oct 18 · 12:00 GMT -- 1,008 mb Tropical Depression
| Oct 18 | 12:00 GMT | 22.1 | 110.7 | -- | 1,008 mb | Tropical Depression | -- |
| Oct 18 | 09:00 GMT | 22.08 | 110.61 | -- | 1,005 mb | Tropical Depression | -- |
| Oct 18 | 06:00 GMT | 22 | 110.5 | -- | 1,002 mb | Tropical Depression | -- |
| Oct 18 | 03:00 GMT | 21.84 | 110.37 | -- | 1,001 mb | Tropical Depression | -- |
| Oct 18 | 00:00 GMT | 21.6 | 110.3 | -- | 1,000 mb | Tropical Depression | -- |
| Oct 17 | 21:00 GMT | 21.3 | 110.36 | -- | 998 mb | Unknown | -- |
| Oct 17 | 18:00 GMT | 21 | 110.5 | -- | 996 mb | Unknown | -- |
| Oct 17 | 15:00 GMT | 20.8 | 110.65 | -- | 990 mb | Unknown | -- |
| Oct 17 | 12:00 GMT | 20.6 | 110.8 | -- | 985 mb | Unknown | -- |
| Oct 17 | 09:00 GMT | 20.31 | 110.89 | -- | 977 mb | Unknown | -- |
| Oct 17 | 06:00 GMT | 20 | 111 | -- | 970 mb | Unknown | -- |
| Oct 17 | 03:00 GMT | 19.74 | 111.2 | -- | 967 mb | Unknown | -- |
| Oct 17 | 00:00 GMT | 19.5 | 111.4 | -- | 965 mb | Unknown | -- |
| Oct 16 | 21:00 GMT | 19.31 | 111.51 | -- | 965 mb | Unknown | -- |
| Oct 16 | 18:00 GMT | 19.1 | 111.6 | -- | 965 mb | Unknown | -- |
| Oct 16 | 15:00 GMT | 18.79 | 111.74 | -- | 962 mb | Unknown | -- |
| Oct 16 | 12:00 GMT | 18.4 | 111.9 | -- | 960 mb | Unknown | -- |
| Oct 16 | 09:00 GMT | 17.97 | 112.07 | -- | 957 mb | Unknown | -- |
| Oct 16 | 06:00 GMT | 17.5 | 112.3 | -- | 955 mb | Unknown | -- |
| Oct 16 | 03:00 GMT | 17 | 112.61 | -- | 952 mb | Unknown | -- |
| Oct 16 | 00:00 GMT | 16.5 | 113 | -- | 950 mb | Unknown | -- |
| Oct 15 | 21:00 GMT | 16.01 | 113.46 | -- | 952 mb | Unknown | -- |
| Oct 15 | 18:00 GMT | 15.6 | 113.9 | -- | 955 mb | Unknown | -- |
| Oct 15 | 15:00 GMT | 15.37 | 114.23 | -- | 957 mb | Unknown | -- |
| Oct 15 | 12:00 GMT | 15.2 | 114.5 | -- | 960 mb | Unknown | -- |
| Oct 15 | 09:00 GMT | 14.92 | 114.74 | -- | 962 mb | Unknown | -- |
| Oct 15 | 06:00 GMT | 14.7 | 115 | -- | 965 mb | Unknown | -- |
| Oct 15 | 03:00 GMT | 14.67 | 115.36 | -- | 965 mb | Unknown | -- |
| Oct 15 | 00:00 GMT | 14.7 | 115.8 | -- | 965 mb | Unknown | -- |
| Oct 14 | 21:00 GMT | 14.68 | 116.34 | -- | 965 mb | Unknown | -- |
| Oct 14 | 18:00 GMT | 14.6 | 116.9 | -- | 965 mb | Unknown | -- |
| Oct 14 | 15:00 GMT | 14.35 | 117.34 | -- | 967 mb | Unknown | -- |
| Oct 14 | 12:00 GMT | 14.2 | 117.8 | -- | 970 mb | Unknown | -- |
| Oct 14 | 09:00 GMT | 14.48 | 118.36 | -- | 970 mb | Unknown | -- |
| Oct 14 | 06:00 GMT | 14.8 | 119 | -- | 970 mb | Unknown | -- |
| Oct 14 | 03:00 GMT | 14.78 | 119.7 | -- | 970 mb | Unknown | -- |
| Oct 14 | 00:00 GMT | 14.6 | 120.4 | -- | 970 mb | Unknown | -- |
| Oct 13 | 21:00 GMT | 14.36 | 121.04 | -- | 965 mb | Unknown | -- |
| Oct 13 | 18:00 GMT | 14.1 | 121.6 | -- | 960 mb | Unknown | -- |
| Oct 13 | 15:00 GMT | 13.88 | 122.07 | -- | 952 mb | Unknown | -- |
| Oct 13 | 12:00 GMT | 13.7 | 122.5 | -- | 945 mb | Unknown | -- |
| Oct 13 | 09:00 GMT | 13.61 | 122.93 | -- | 935 mb | Unknown | -- |
| Oct 13 | 06:00 GMT | 13.5 | 123.4 | -- | 925 mb | Unknown | -- |
| Oct 13 | 03:00 GMT | 13.27 | 123.99 | -- | 917 mb | Unknown | -- |
| Oct 13 | 00:00 GMT | 13 | 124.6 | -- | 910 mb | Unknown | -- |
| Oct 12 | 21:00 GMT | 12.79 | 125.17 | -- | 907 mb | Unknown | -- |
| Oct 12 | 18:00 GMT | 12.6 | 125.7 | -- | 905 mb | Unknown | -- |
| Oct 12 | 15:00 GMT | 12.42 | 126.2 | -- | 912 mb | Unknown | -- |
| Oct 12 | 12:00 GMT | 12.2 | 126.6 | -- | 920 mb | Unknown | -- |
| Oct 12 | 09:00 GMT | 11.88 | 126.82 | -- | 927 mb | Unknown | -- |
| Oct 12 | 06:00 GMT | 11.6 | 127.1 | -- | 935 mb | Unknown | -- |
| Oct 12 | 03:00 GMT | 11.45 | 127.73 | -- | 942 mb | Unknown | -- |
| Oct 12 | 00:00 GMT | 11.4 | 128.4 | -- | 950 mb | Unknown | -- |
| Oct 11 | 21:00 GMT | 11.43 | 128.81 | -- | 957 mb | Unknown | -- |
| Oct 11 | 18:00 GMT | 11.5 | 129.2 | -- | 965 mb | Unknown | -- |
| Oct 11 | 15:00 GMT | 11.52 | 129.77 | -- | 970 mb | Unknown | -- |
| Oct 11 | 12:00 GMT | 11.5 | 130.4 | -- | 975 mb | Unknown | -- |
| Oct 11 | 09:00 GMT | 11.41 | 130.97 | -- | 975 mb | Unknown | -- |
| Oct 11 | 06:00 GMT | 11.3 | 131.6 | -- | 975 mb | Unknown | -- |
| Oct 11 | 03:00 GMT | 11.2 | 132.35 | -- | 980 mb | Unknown | -- |
| Oct 11 | 00:00 GMT | 11.1 | 133.2 | -- | 985 mb | Unknown | -- |
| Oct 10 | 21:00 GMT | 10.99 | 134.12 | -- | 987 mb | Unknown | -- |
| Oct 10 | 18:00 GMT | 10.9 | 135.1 | -- | 990 mb | Unknown | -- |
| Oct 10 | 15:00 GMT | 10.87 | 136.12 | -- | 990 mb | Unknown | -- |
| Oct 10 | 12:00 GMT | 10.8 | 137.1 | -- | 990 mb | Unknown | -- |
| Oct 10 | 09:00 GMT | 10.6 | 137.98 | -- | 992 mb | Unknown | -- |
| Oct 10 | 06:00 GMT | 10.3 | 138.8 | -- | 995 mb | Unknown | -- |
| Oct 10 | 03:00 GMT | 9.9 | 139.63 | -- | 996 mb | Unknown | -- |
| Oct 10 | 00:00 GMT | 9.5 | 140.4 | -- | 998 mb | Unknown | -- |
| Oct 9 | 21:00 GMT | 9.23 | 141.07 | -- | 999 mb | Tropical Depression | -- |
| Oct 9 | 18:00 GMT | 9 | 141.7 | -- | 1,000 mb | Tropical Depression | -- |
| Oct 9 | 15:00 GMT | 8.73 | 142.39 | -- | 1,001 mb | Tropical Depression | -- |
| Oct 9 | 12:00 GMT | 8.5 | 143.1 | -- | 1,002 mb | Tropical Depression | -- |
| Oct 9 | 09:00 GMT | 8.33 | 143.85 | -- | 1,002 mb | Tropical Depression | -- |
| Oct 9 | 06:00 GMT | 8.2 | 144.6 | -- | 1,002 mb | Tropical Depression | -- |
| Oct 9 | 03:00 GMT | 8.1 | 145.31 | -- | 1,003 mb | Tropical Depression | -- |
| Oct 9 | 00:00 GMT | 8 | 146 | -- | 1,004 mb | Tropical Depression | -- |
Learn more about Tropical Depression Joan and the 1970 Western Pacific hurricane season in our hurricane archive.
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