A flash flood warning, issued by weather forecasting agencies like the National Weather Service, alerts the public to imminent or ongoing flash floods in a specific area. Flash floods are sudden and violent, typically caused by heavy rainfall or dam failures. Several factors contribute to their formation, including rainfall intensity and duration, the area's topography, soil conditions, and the type of ground cover.
The Southwest experienced severe flash floods due to heavy rainfall, with some areas receiving a month's worth of rain in a single day. Hurricane Priscilla's remnants fueled widespread rain, particularly impacting Arizona. A First Alert Weather Day was issued.
On August 27, 2017, the NWS issued a "Flash Flood Emergency for Catastrophic Life Threatening Flooding" in southeast Texas, due to torrential rain brought by Hurricane Harvey.
On September 10, 2017, the NWS issued a Flash Flood Emergency for life-threatening storm surge because of Hurricane Irma in southwestern Florida at the eye landfall.
On February 6, 2020, the NWS issued a Flash Flood Emergency for Tazewell County, Virginia, due to a major storm causing the Clinch River to crest at its highest level in 40 years.
On May 20, 2020, the NWS issued a Flash Flood Emergency for the Tittabawassee River in Midland County, Michigan, due to multiple dam failures causing the river to overflow and reach its highest crest since 1986.
On July 6, 2020, the NWS issued a Flash Flood Emergency for Tacony Creek and Frankford Creek, the former situated along Montgomery County and North Philadelphia, Pennsylvania, and the latter along Philadelphia's Frankford neighborhood.
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 caused torrential rains.
On July 28, 2022, the NWS issued several Flash Flood Emergencies in eastern Kentucky for catastrophic and deadly flooding.
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.
On September 27, 2024, a Flash Flood Emergency was issued for Metro Atlanta as Hurricane Helene brought catastrophic flooding to the area.
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.
As of August 8, 2025, at least 135 people have been confirmed dead from the central Texas flooding event that occurred from July 4-7, 2025.
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