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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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Arizona severe thunderstorms: SPC Day 1 outlook map with an Enhanced Risk over Flagstaff and Prescott, October 21, 2026

Arizona Severe Thunderstorms: SPC Enhanced Risk for Flagstaff and Prescott on October 21, 2026

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Southern Plains severe storms SPC Day 1 outlook for October 14, 2026, with a Slight Risk over Oklahoma and West Texas and Marginal Risk areas fromTulsa to the Mid-Atlantic

Southern Plains Severe Storms: SPC Slight Risk for Oklahoma and West Texas on October 14, 2026

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