Today in Weather History – September 25th
The only known eastern Pacific tropical cyclone to move onshore into southern California made landfall at Long Beach CA on this date in 1939 with sustained winds of 50 mph.
Rainfall of five inches in the Los Angeles basin and six to twelve inches in the surrounding mountains occurred on the 25th.
The heaviest rain in the deserts occurred the day before with 6.45 inches of rain at Indio in a 6-hour period on the 24th.
An average of 18 tropical cyclones form in the eastern Pacific each year and about half become hurricanes. Some brush western Mexico, and every few years, one will threaten Hawaii. But few ever threaten the U.S. This is because winds over the tropics generally blow east to west and cold water off California usually weakens any storms that happen to come northeast.
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Bill Murray is the President of The Weather Factory. He is the site's official weather historian and a weekend forecaster. He also anchors the site's severe weather coverage. Bill Murray is the proud holder of National Weather Association Digital Seal #0001 @wxhistorianSubscribe
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