National Weather Service United States Department of Commerce

SEVERE Weather Awareness Week Public Information Statements


Severe Weather Awareness Week Intro

Severe Weather definitions

Severe Thunderstorms

Severe Weather Preparedness and Safety


Flash Flooding




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 Awareness - NOAA

Natural Hazard Statistics

Severe Weather 101: Thunderstorms - NSSL

Severe Weather Awareness

Severe Weather Climatology - SPC

Severe Weather GIS - SVRGIS - severe report database

Storm-based Warnings

Thunderstorms, Tornadoes & Lightning...

Why 1 inch Hail Criteria for Severe Thunderstorms?


Local Definitions / Preparedness Page