National Weather Service United States Department of Commerce

SEVERE THUNDERSTORM - a thunderstorm which produces:

hail 1 inch or greater

winds greater than 58 mph

damage to trees, telephone/utility poles or any structure



SEVERE THUNDERSTORM WATCH - issued by the Storm Prediction Center when severe thunderstorms are possible in and near the watch area (box). The watch is issued for a large area and is usually in effect for several hours.


SEVERE THUNDERSTORM WARNING - issued by your local NWS Forecast Office when severe weather is imminent or occurring and is usually in effect for about an hour.


Local Severe Weather Briefing Page


Lightning Safety Page - NWS

Thunderstorms & Tornadoes Safety Page - NWS

Severe Weather Climatology - SPC

Severe Weather GIS - SVRGIS - severe report database


Local Definitions / Preparedness Page