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The National Weather Service office in State College, Pennsylvania, issued a rare Flash Flood Emergency warning of ...

A flash flood warning was issued by the National Weather Service in Denver at 11:40 a.m. on Tuesday, June 17.

A flash flood warning was issued by the National Weather Service in Denver at 11:40 a.m. on Tuesday, June 17.

The agency upgraded the flash flood warning to an emergency at 6:13 p.m., citing "3 to 6 inches of rain" that had fallen in parts of the city.

A flash flood advisory is also in effect in portions of Central Texas, including Bastrop, Caldwell, Hays, and Travis, until 9:15 a.m. CT.

Flash flooding will hit four states due to sudden and heavy rains expected Sunday into Monday morning, potentially impacting Memorial Day plans. Why It Matters. This year, ...

(MORE: What A 'Flash Flood Emergency' Means) Among the hardest hit areas was western Allegany County, Maryland, particularly the town of Westernport, about 115 miles west-northwest of Washington, D.C.

Flash Flood Watch issued. Right now, the general idea is 3-6″ across much of south Louisiana and Mississippi from 7 p.m. Tuesday through 7 p.m. Thursday. Hot spots of 8-10+” likely.

If you’re in a flood-prone area during a flash flood warning, move to higher ground immediately. Flash floods can even occur in areas that aren't receiving rain, the National Weather Service warns.

Over 4,000 flash flood warnings are issued across the United States every year, but only a fraction are declared emergencies. Here is everything you need to know about the rare weather alert.