Storm Activity: May 21, 1964 - May 30, 1964
May 30 · 12:00 GMT -- 1,006 mb Extratropical
| May 30 | 12:00 GMT | 27.2 | 116.4 | -- | 1,006 mb | Extratropical | -- |
| May 30 | 09:00 GMT | 26.99 | 116.2 | -- | 1,005 mb | Extratropical | -- |
| May 30 | 06:00 GMT | 26.8 | 116 | -- | 1,005 mb | Extratropical | -- |
| May 30 | 03:00 GMT | 26.66 | 115.82 | -- | 1,004 mb | Extratropical | -- |
| May 30 | 00:00 GMT | 26.5 | 115.6 | -- | 1,004 mb | Extratropical | -- |
| May 29 | 21:00 GMT | 26.27 | 115.32 | -- | 1,004 mb | Tropical Depression | -- |
| May 29 | 18:00 GMT | 26 | 115 | -- | 1,004 mb | Tropical Depression | -- |
| May 29 | 15:00 GMT | 25.72 | 114.67 | -- | 1,003 mb | Tropical Depression | -- |
| May 29 | 12:00 GMT | 25.4 | 114.3 | -- | 1,002 mb | Tropical Depression | -- |
| May 29 | 09:00 GMT | 25 | 113.88 | -- | 1,002 mb | Tropical Depression | -- |
| May 29 | 06:00 GMT | 24.6 | 113.5 | -- | 1,002 mb | Tropical Depression | -- |
| May 29 | 03:00 GMT | 24.29 | 113.26 | -- | 1,001 mb | Tropical Depression | -- |
| May 29 | 00:00 GMT | 24 | 113.1 | -- | 1,000 mb | Tropical Depression | -- |
| May 28 | 21:00 GMT | 23.63 | 112.99 | -- | 998 mb | Unknown | -- |
| May 28 | 18:00 GMT | 23.3 | 112.9 | -- | 996 mb | Unknown | -- |
| May 28 | 15:00 GMT | 23.08 | 112.74 | -- | 995 mb | Unknown | -- |
| May 28 | 12:00 GMT | 22.9 | 112.6 | -- | 994 mb | Unknown | -- |
| May 28 | 09:00 GMT | 22.72 | 112.51 | -- | 992 mb | Unknown | -- |
| May 28 | 06:00 GMT | 22.5 | 112.5 | -- | 990 mb | Unknown | -- |
| May 28 | 03:00 GMT | 22.18 | 112.6 | -- | 987 mb | Unknown | -- |
| May 28 | 00:00 GMT | 21.8 | 112.8 | -- | 985 mb | Unknown | -- |
| May 27 | 21:00 GMT | 21.41 | 113.08 | -- | 985 mb | Unknown | -- |
| May 27 | 18:00 GMT | 21 | 113.4 | -- | 985 mb | Unknown | -- |
| May 27 | 15:00 GMT | 20.58 | 113.71 | -- | 982 mb | Unknown | -- |
| May 27 | 12:00 GMT | 20.2 | 114 | -- | 980 mb | Unknown | -- |
| May 27 | 09:00 GMT | 19.93 | 114.32 | -- | 981 mb | Unknown | -- |
| May 27 | 06:00 GMT | 19.7 | 114.5 | -- | 982 mb | Unknown | -- |
| May 27 | 03:00 GMT | 19.48 | 114.37 | -- | 983 mb | Unknown | -- |
| May 27 | 00:00 GMT | 19.2 | 114.2 | -- | 985 mb | Unknown | -- |
| May 26 | 21:00 GMT | 18.74 | 114.3 | -- | 986 mb | Unknown | -- |
| May 26 | 18:00 GMT | 18.3 | 114.5 | -- | 988 mb | Unknown | -- |
| May 26 | 15:00 GMT | 18.1 | 114.69 | -- | 988 mb | Unknown | -- |
| May 26 | 12:00 GMT | 18 | 114.9 | -- | 988 mb | Unknown | -- |
| May 26 | 09:00 GMT | 17.89 | 115.12 | -- | 989 mb | Unknown | -- |
| May 26 | 06:00 GMT | 17.8 | 115.3 | -- | 990 mb | Unknown | -- |
| May 26 | 03:00 GMT | 17.73 | 115.45 | -- | 990 mb | Unknown | -- |
| May 26 | 00:00 GMT | 17.6 | 115.5 | -- | 990 mb | Unknown | -- |
| May 25 | 21:00 GMT | 17.31 | 115.44 | -- | 992 mb | Unknown | -- |
| May 25 | 18:00 GMT | 17 | 115.3 | -- | 994 mb | Unknown | -- |
| May 25 | 15:00 GMT | 16.83 | 115.16 | -- | 995 mb | Tropical Depression | -- |
| May 25 | 12:00 GMT | 16.7 | 115 | -- | 996 mb | Tropical Depression | -- |
| May 25 | 09:00 GMT | 16.55 | 114.86 | -- | 996 mb | Tropical Depression | -- |
| May 25 | 06:00 GMT | 16.4 | 114.7 | -- | 996 mb | Tropical Depression | -- |
| May 25 | 03:00 GMT | 16.24 | 114.51 | -- | 997 mb | Tropical Depression | -- |
| May 25 | 00:00 GMT | 16.1 | 114.3 | -- | 998 mb | Tropical Depression | -- |
| May 24 | 21:00 GMT | 15.98 | 114.1 | -- | 999 mb | Tropical Depression | -- |
| May 24 | 18:00 GMT | 15.9 | 113.9 | -- | 1,000 mb | Tropical Depression | -- |
| May 24 | 15:00 GMT | 15.89 | 113.71 | -- | 1,001 mb | Tropical Depression | -- |
| May 24 | 12:00 GMT | 15.9 | 113.5 | -- | 1,002 mb | Tropical Depression | -- |
| May 24 | 09:00 GMT | 15.92 | 113.24 | -- | 1,002 mb | Tropical Depression | -- |
| May 24 | 06:00 GMT | 15.9 | 113 | -- | 1,003 mb | Tropical Depression | -- |
| May 24 | 03:00 GMT | 15.76 | 112.85 | -- | 1,003 mb | Tropical Depression | -- |
| May 24 | 00:00 GMT | 15.6 | 112.7 | -- | 1,004 mb | Tropical Depression | -- |
| May 23 | 21:00 GMT | 15.49 | 112.41 | -- | 1,004 mb | Tropical Depression | -- |
| May 23 | 18:00 GMT | 15.4 | 112.2 | -- | 1,004 mb | Tropical Depression | -- |
| May 23 | 15:00 GMT | 15.3 | 112.26 | -- | 1,004 mb | Tropical Depression | -- |
| May 23 | 12:00 GMT | 15.2 | 112.4 | -- | 1,004 mb | Tropical Depression | -- |
| May 23 | 09:00 GMT | 15.12 | 112.47 | -- | 1,004 mb | Tropical Depression | -- |
| May 23 | 06:00 GMT | 15 | 112.5 | -- | 1,004 mb | Tropical Depression | -- |
| May 23 | 03:00 GMT | 14.77 | 112.5 | -- | 1,005 mb | Tropical Depression | -- |
| May 23 | 00:00 GMT | 14.5 | 112.5 | -- | 1,006 mb | Tropical Depression | -- |
| May 22 | 21:00 GMT | 14.29 | 112.56 | -- | 1,005 mb | Tropical Depression | -- |
| May 22 | 18:00 GMT | 14.1 | 112.6 | -- | 1,004 mb | Tropical Depression | -- |
| May 22 | 15:00 GMT | 13.9 | 112.56 | -- | 1,004 mb | Tropical Depression | -- |
| May 22 | 12:00 GMT | 13.7 | 112.5 | -- | 1,004 mb | Tropical Depression | -- |
| May 22 | 09:00 GMT | 13.5 | 112.51 | -- | 1,004 mb | Tropical Depression | -- |
| May 22 | 06:00 GMT | 13.3 | 112.5 | -- | 1,004 mb | Tropical Depression | -- |
| May 22 | 03:00 GMT | 13.09 | 112.42 | -- | 1,004 mb | Tropical Depression | -- |
| May 22 | 00:00 GMT | 12.9 | 112.3 | -- | 1,005 mb | Tropical Depression | -- |
| May 21 | 21:00 GMT | 12.74 | 112.16 | -- | 1,005 mb | Tropical Depression | -- |
| May 21 | 18:00 GMT | 12.6 | 112 | -- | 1,005 mb | Tropical Depression | -- |
Learn more about Tropical Depression Viola and the 1964 Western Pacific hurricane season in our hurricane archive.
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