A flash flood warning is a critical alert issued by weather forecasting agencies, like the National Weather Service, to inform the public about an imminent or ongoing flash flood. These floods are characterized by their sudden and violent nature, often triggered by intense rainfall or dam failures. Several factors influence the likelihood of flash flooding, including the intensity and duration of rainfall, the topography of the land, soil conditions, and the type of ground cover in the area.
On August 27, 2017, the NWS issued a "Flash Flood Emergency for Catastrophic Life Threatening Flooding" as Hurricane Harvey brought torrential rain to southeast Texas.
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 moving through the area which caused the Clinch River to rise to its highest crest 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 transitioned and intensified into a post-tropical cyclone, causing 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. A statement was later posted on Twitter.
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.
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