Severe · Severe Thunderstorm WatchActive alert

Severe Thunderstorm Watch issued September 20 at 9:01PM MDT until September 21

Affecting Adams, CO; Arapahoe, CO; Denver, CO; Douglas, CO; Elbert, CO; Lincoln, CO

In effect until: Sep 21, 2026, 9:00 AM

Adams, CO; Arapahoe, CO; Denver, CO; Douglas, CO; Elbert, CO; Lincoln, CO

Possible impact zone across 6 counties in CO; conditions develop through 9:00 AM.

Go indoors and stay away from windows until the storm passes.

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Read the original bulletin (official text)

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
674 IN EFFECT UNTIL 3 AM MDT MONDAY FOR THE FOLLOWING AREAS

IN COLORADO THIS WATCH INCLUDES 6 COUNTIES

IN EAST CENTRAL COLORADO

ELBERT                LINCOLN

IN NORTHEAST COLORADO

ADAMS                 ARAPAHOE              DENVER
DOUGLAS

THIS INCLUDES THE CITIES OF AURORA, CASTLE ROCK, CENTENNIAL,
DENVER, DENVER INTERNATIONAL AIRPORT, ELIZABETH, KIOWA, LIMON,
PARKER, THORNTON, AND WESTMINSTER.

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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Severe Thunderstorm Watch issued September 20 at 9:01PM MDT until September 21

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