Storm Activity: Jul 14, 1970 - Jul 21, 1970
Jul 21 · 12:00 GMT 30 mph -- Tropical Depression
| Jul 21 | 12:00 GMT | 18.4 | -121.3 | 30 mph | -- | Tropical Depression | -- |
| Jul 21 | 09:00 GMT | 18.51 | -121.04 | 30 mph | -- | Tropical Depression | -- |
| Jul 21 | 06:00 GMT | 18.6 | -120.8 | 30 mph | -- | Tropical Depression | -- |
| Jul 21 | 03:00 GMT | 18.66 | -120.59 | 30 mph | -- | Tropical Depression | -- |
| Jul 21 | 00:00 GMT | 18.7 | -120.4 | 30 mph | -- | Tropical Depression | -- |
| Jul 20 | 21:00 GMT | 18.75 | -120.2 | 30 mph | -- | Tropical Depression | -- |
| Jul 20 | 18:00 GMT | 18.8 | -120 | 30 mph | -- | Tropical Depression | -- |
| Jul 20 | 15:00 GMT | 18.86 | -119.8 | 30 mph | -- | Tropical Depression | -- |
| Jul 20 | 12:00 GMT | 18.9 | -119.6 | 35 mph | -- | Tropical Depression | -- |
| Jul 20 | 09:00 GMT | 18.92 | -119.39 | 35 mph | -- | Tropical Storm | -- |
| Jul 20 | 06:00 GMT | 18.9 | -119.2 | 40 mph | -- | Tropical Storm | -- |
| Jul 20 | 03:00 GMT | 18.81 | -119.04 | 40 mph | -- | Tropical Storm | -- |
| Jul 20 | 00:00 GMT | 18.7 | -118.9 | 40 mph | -- | Tropical Storm | -- |
| Jul 19 | 21:00 GMT | 18.64 | -118.79 | 45 mph | -- | Tropical Storm | -- |
| Jul 19 | 18:00 GMT | 18.6 | -118.7 | 45 mph | -- | Tropical Storm | -- |
| Jul 19 | 15:00 GMT | 18.56 | -118.65 | 45 mph | -- | Tropical Storm | -- |
| Jul 19 | 12:00 GMT | 18.5 | -118.6 | 45 mph | -- | Tropical Storm | -- |
| Jul 19 | 09:00 GMT | 18.4 | -118.51 | 45 mph | -- | Tropical Storm | -- |
| Jul 19 | 06:00 GMT | 18.3 | -118.4 | 45 mph | -- | Tropical Storm | -- |
| Jul 19 | 03:00 GMT | 18.25 | -118.31 | 45 mph | -- | Tropical Storm | -- |
| Jul 19 | 00:00 GMT | 18.2 | -118.2 | 45 mph | -- | Tropical Storm | -- |
| Jul 18 | 21:00 GMT | 18.1 | -118.05 | 45 mph | -- | Tropical Storm | -- |
| Jul 18 | 18:00 GMT | 18 | -117.9 | 45 mph | -- | Tropical Storm | -- |
| Jul 18 | 15:00 GMT | 17.94 | -117.8 | 50 mph | -- | Tropical Storm | -- |
| Jul 18 | 12:00 GMT | 17.9 | -117.7 | 50 mph | -- | Tropical Storm | -- |
| Jul 18 | 09:00 GMT | 17.86 | -117.55 | 50 mph | -- | Tropical Storm | -- |
| Jul 18 | 06:00 GMT | 17.8 | -117.4 | 50 mph | -- | Tropical Storm | -- |
| Jul 18 | 03:00 GMT | 17.71 | -117.29 | 50 mph | -- | Tropical Storm | -- |
| Jul 18 | 00:00 GMT | 17.6 | -117.2 | 50 mph | -- | Tropical Storm | -- |
| Jul 17 | 21:00 GMT | 17.49 | -117.11 | 50 mph | -- | Tropical Storm | -- |
| Jul 17 | 18:00 GMT | 17.4 | -117 | 50 mph | -- | Tropical Storm | -- |
| Jul 17 | 15:00 GMT | 17.36 | -116.86 | 50 mph | -- | Tropical Storm | -- |
| Jul 17 | 12:00 GMT | 17.3 | -116.7 | 50 mph | -- | Tropical Storm | -- |
| Jul 17 | 09:00 GMT | 17.17 | -116.54 | 50 mph | -- | Tropical Storm | -- |
| Jul 17 | 06:00 GMT | 17 | -116.4 | 50 mph | -- | Tropical Storm | -- |
| Jul 17 | 03:00 GMT | 16.79 | -116.31 | 50 mph | -- | Tropical Storm | -- |
| Jul 17 | 00:00 GMT | 16.6 | -116.2 | 50 mph | -- | Tropical Storm | -- |
| Jul 16 | 21:00 GMT | 16.52 | -116.02 | 50 mph | -- | Tropical Storm | -- |
| Jul 16 | 18:00 GMT | 16.5 | -115.8 | 50 mph | -- | Tropical Storm | -- |
| Jul 16 | 15:00 GMT | 16.48 | -115.62 | 50 mph | -- | Tropical Storm | -- |
| Jul 16 | 12:00 GMT | 16.5 | -115.4 | 50 mph | -- | Tropical Storm | -- |
| Jul 16 | 09:00 GMT | 16.54 | -115.12 | 50 mph | -- | Tropical Storm | -- |
| Jul 16 | 06:00 GMT | 16.6 | -114.8 | 50 mph | -- | Tropical Storm | -- |
| Jul 16 | 03:00 GMT | 16.65 | -114.52 | 50 mph | -- | Tropical Storm | -- |
| Jul 16 | 00:00 GMT | 16.7 | -114.2 | 50 mph | -- | Tropical Storm | -- |
| Jul 15 | 21:00 GMT | 16.77 | -113.82 | 50 mph | -- | Tropical Storm | -- |
| Jul 15 | 18:00 GMT | 16.8 | -113.4 | 50 mph | 1,009 mb | Tropical Storm | -- |
| Jul 15 | 15:00 GMT | 16.79 | -113.02 | 50 mph | -- | Tropical Storm | -- |
| Jul 15 | 12:00 GMT | 16.7 | -112.6 | 50 mph | -- | Tropical Storm | -- |
| Jul 15 | 09:00 GMT | 16.53 | -112.07 | 50 mph | -- | Tropical Storm | -- |
| Jul 15 | 06:00 GMT | 16.3 | -111.5 | 45 mph | -- | Tropical Storm | -- |
| Jul 15 | 03:00 GMT | 16.05 | -111.02 | 45 mph | -- | Tropical Storm | -- |
| Jul 15 | 00:00 GMT | 15.8 | -110.5 | 45 mph | -- | Tropical Storm | -- |
| Jul 14 | 21:00 GMT | 15.59 | -109.83 | 40 mph | -- | Tropical Depression | -- |
| Jul 14 | 18:00 GMT | 15.4 | -109.1 | 35 mph | -- | Tropical Depression | -- |
| Jul 14 | 15:00 GMT | 15.24 | -108.39 | 30 mph | -- | Tropical Depression | -- |
| Jul 14 | 12:00 GMT | 15.1 | -107.7 | 30 mph | -- | Tropical Depression | -- |
Learn more about Tropical Storm Gretchen and the 1970 Eastern Pacific hurricane season in our hurricane archive.
View All Hurricanes and Tropical Cyclones