Severe Thunderstorm Watch and Heat Advisory

Posted at 3 p.m.

Thunderstorm WatchA severe thunderstorm watch, issued by the National Weather Service, remains in effect until 9 p.m. this evening. In addition, a heat advisory is in effect until 7 p.m.

Live Weather Radar

Severe Thunderstorm Watch

A severe thunderstorm watch is issued by the National Weather Service when conditions are favorable for the development of severe thunderstorms in and close to the watch area. A severe thunderstorm by definition is a thunderstorm that produces one inch hail or larger in diameter and/or winds equal or exceed 58 miles an hour.

Heat Advisory

A Heat Advisory is issued when the heat index value is expected to reach 105 to 109 degrees (east of the Blue Ridge) or 100 to 104 degrees (west of the Blue Ridge) within the next 12 to 24 hours. A Heat Advisory may be issued for lower criteria if it is early in the season or during a multi-day heat wave.

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About Fairfax County Emergency Information

Official emergency information about preparedness, response and recovery from Fairfax County Government.

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