National Weather Service United States Department of Commerce

Heavy Rainfall Along the Eastern Seaboard; Dangerous Heat Wave Shifting East Next Week

Showers and thunderstorms may produce heavy to excessive rainfall along the east coast today. The associated rainfall will likely create localized areas of flash and urban flooding. An extremely dangerous heat wave will shift into portions of the central and eastern U.S. late this weekend, lasting through the next work week. Widespread daily record high temperatures are expected. Read More >

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North Texas Flash Flood Climatology

   

 

Flash flooding kills more people annually than any other type of severe weather.  There are numerous social, educational, and political issues that contribute to the high fatality rates associated with flash flooding.  According to the American Meteorology Society (AMS), flash flooding is a “flood that rises and falls quite rapidly with little or no advance warning, usually as the result of intense rainfall over a relatively small area.”  But what does that mean?  How much rain over how big of an area constitutes a flash flood?  Forecasters, the public, the media, storm spotters, and law enforcement officials all have ideas about whether a situation is a flash flood or not.  It is ultimately up to National Weather Service (NWS) forecasters to classify whether an event is a flash flood.  Storm Data, issued by the National Climatic Data Center, is the official publication for severe weather events.  Flash flooding was first documented in Storm Data in 1995. 

 

Unlike other severe weather events, such as tornadoes and hail, flash flooding can be caused and exacerbated by high population densities and poorly planned urban infrastructure.  This makes flash flooding a unique warning and forecasting challenge as forecasters must take into account more than just meteorological factors.  That is why this database, which identifies the most dangerous locations in north Texas, can be a crucial piece of information for issuing effective warnings.  In addition, findings from this study may be incorporated into warning templates, thereby strengthening the public’s perception of danger and hopefully saving lives.

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