NEW 1 Inch Hail Criteria

On January 4th, 2010, at 6:01 pm, all National Weather Service forecast offices will operationally change the minimum hail size criterion used to issue severe thunderstorm warnings from 3/4 inch (penny sized) diameter or larger hail to 1 inch (quarter sized) diameter or larger.

No change is being made to the severe thunderstorm warning criterion of wind gusts equal to or in excess of 58 miles per hour.

For further information regarding this change, please contact:

  JOHN T FERREE
  FIRE AND PUBLIC WEATHER SERVICES BRANCH
  120 DAVID L. BOREN BLVD SUITE 2312
  NORMAN OK 73072
  405-325-2209
  JOHN.T.FERREE@NOAA.GOV

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