Severe Hail Criteria Changes Jan 5th

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.

Return to News Archive is the U.S. government's official web portal to all federal, state and local government web resources and services.