National Weather Service Weather Forecast Office

NEW 1 Inch Hail Criteria

On January 4th, 2010, at 6:01 pm, all National Weather Service forecast offices will change the minimum hail size criterion used to issue severe thunderstorm warnings from 3/4 inch diameter (penny sized) to 1 inch diameter (quarter sized) or larger.  This means will no longer issue severe thunderstorm warnings for hail smaller than one inch in diameter.

We are not changing the wind criteria - it will remain the same at 58 mph.

Click here for more details on the change.