History of Flash flood warning in Timeline

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Flash flood warning

A flash flood warning is a critical alert issued by weather forecasting agencies to inform the public about an imminent or ongoing flash flood. These sudden and dangerous floods result from intense rainfall or dam failures. Key factors contributing to flash floods include rainfall intensity and duration, the landscape's topography, soil conditions, and the type of ground cover in the affected area.

August 27, 2017: Flash Flood Emergency for Catastrophic Life Threatening Flooding

On August 27, 2017, the NWS issued a "Flash Flood Emergency for Catastrophic Life Threatening Flooding" as Hurricane Harvey caused torrential rain in southeast Texas.

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September 10, 2017: Flash Flood Emergency for life-threatening storm surge because of Hurricane Irma

On September 10, 2017, the NWS issued a Flash Flood Emergency for life-threatening storm surge due to Hurricane Irma in southwestern Florida at the eye landfall.

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February 6, 2020: Flash Flood Emergency for Tazewell County, Virginia

On February 6, 2020, the NWS issued a Flash Flood Emergency for Tazewell County, Virginia, because of a major storm that caused the Clinch River to crest at its highest level in 40 years.

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May 20, 2020: Flash Flood Emergency for the Tittabawassee River in Midland County, Michigan

On May 20, 2020, the NWS issued a Flash Flood Emergency for the Tittabawassee River in Midland County, Michigan, because of multiple dam failures that caused the river to overflow and reach its highest level since 1986.

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July 6, 2020: Flash Flood Emergency for Tacony Creek and Frankford Creek

On July 6, 2020, the NWS issued a Flash Flood Emergency for Tacony Creek and Frankford Creek, located along Montgomery County and North Philadelphia, Pennsylvania, and Philadelphia's Frankford neighborhood, respectively.

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September 2, 2021: First ever Flash Flood Emergency for New York City, Philadelphia, Fairfield and New Haven Counties in Connecticut, and most of Central New Jersey

On September 2, 2021, the NWS issued a first-ever Flash Flood Emergency for New York City, Philadelphia, Fairfield and New Haven Counties in Connecticut, and most of Central New Jersey as the remnants of Hurricane Ida transitioned and intensified into a post tropical cyclone causing torrential rains. Some areas reported up to 10 inches of rain in less than an hour.

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July 28, 2022: Flash Flood Emergencies in eastern Kentucky for catastrophic and deadly flooding

On July 28, 2022, the NWS issued several Flash Flood Emergencies in eastern Kentucky for catastrophic and deadly flooding.

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March 27, 2023: Flash Flood Emergency for a dam break on the Head's Creek Reservoir in Spaulding County, Georgia

On March 27, 2023, the NWS issued a Flash Flood Emergency for a dam break on the Head's Creek Reservoir in Spaulding County, Georgia. A statement was later posted on Twitter.

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September 27, 2024: Flash Flood Emergency was issued for Metro Atlanta as Hurricane Helene

On September 27, 2024, a Flash Flood Emergency was issued for Metro Atlanta as Hurricane Helene brought catastrophic flooding to the area.

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October 9, 2024: Flash Flood Emergency was issued for several counties in the Tampa Bay and Big Bend areas of Florida as Hurricane Milton

On October 9, 2024, a Flash Flood Emergency was issued for several counties in the Tampa Bay and Big Bend areas of Florida as Hurricane Milton posed life-threatening flooding to a large portion of the West Coast.

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July 16, 2025: At least 134 people have been confirmed dead from this event as of July 16, 2025

As of July 16, 2025, at least 134 people have been confirmed dead due to catastrophic flooding in central Texas caused by a slow-moving mesoscale convective system, particularly in Kerr County from July 4-7, 2025.

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