Monday, 17 April 2017


The following list includes terminology used by the National Weather Service for those public statements pertaining specifically to severe local storms. These storms are usually convective and contain severe weather with large hail (one-inch diameter or larger) and/or strong winds (58 miles per hour or greater) meeting the specific criteria, as well as tornadoes and flash flooding due to excessive precipitation in thunderstorms. (NOTE: In January 2010, the National Weather Service changed the minimum hail size criterion for severe thunderstorms from three-quarters of an inch to one inch.) A description of those statements used to alert the public for flash floods will accompany Thursday's concept. The other pertinent terms are given:

The Storm Prediction Center issues Convective Outlooks and Second Day Severe Weather Outlooks that are primarily for internal use and outline the geographic regions where severe weather may develop. However, some of the information contained in these guidance products is used on television weathercasts. These Outlooks include levels of risk, ranging from slight to moderate to high.

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Prepared by Edward J. Hopkins, Ph.D., email
© Copyright, 2017, The American Meteorological Society.