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Criteria for a flood warning and flash flood warning

The National Weather Service (NWS) is the official U.S. government agency charged with issuing weather watches, warnings, and advisories and is the source used by iAlert.com. Below is the criteria for a flooding used by NWS forecasters when issuing flood warnings across the country…. FLOOD WARNING: A Flood Warning is issued when inundation of a normally dry area near a stream or other watercourse is expected, OR unusually severe ponding of water expected. Flooding of rivers or streams doesn’t always required rain to be overhead for your area to flood. Heavy rain upstream will make its way downstream causing flooding. FLASH FLOOD WARNING: A Flash Flood Warning will be issued after few hours of locally heavy rainfall, a dam or levee failure, or water released from an ice jam rapidly flooding nearby land. Although flash flooding typically occurs in hilly or mountainous areas flash flooding can happen anywhere Looking for the criteria for a tornado warning, criteria of a severe thunderstorm warning, or weather glossary?
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Great Lakes Mid-Atlantic severe thunderstorms SPC Day 1 categorical outlook for September 2, 2026, showing a Slight Risk from Detroit, Cleveland, and Buffalo through Pittsburgh, Philadelphia, Baltimore, and Washington D.C., a second Slight Risk over Great Falls, Montana, and Marginal Risk areas around New York City, Milwaukee, Richmond, and Williston, North Dakota

Great Lakes Mid-Atlantic Severe Thunderstorms: Slight Risk of Damaging Wind, Hail, and Tornadoes September 2, 2026

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Gulf Coast tropical storm satellite and radar view of Potential Tropical Cyclone Five south of Louisiana with the NHC forecast track into the upper Texas coast, August 31, 2026

Gulf Coast Tropical Storm Warning: Potential Tropical Cyclone Five Targets Texas and Louisiana Tuesday

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Tropical Storm Dolly satellite image and NHC forecast track across the central Atlantic toward the Leeward Islands, August 27, 2026.

Tropical Storm Dolly Forms Over the Central Atlantic: Leeward Islands Should Monitor Progress

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