National Weather Service United States Department of Commerce

Heavy Rain For the Northeast and Much Cooler

A strong cold front will bring periods of heavy rain and isolated flash flooding to portions of Pennsylvania and New York State today. Much cooler and showery weather will build into New England and the northeast over the weekend. Read More >

Flash Flood Guidance


Flash Flood Guidance is an estimate of the amount of rainfall required over a given area during a given duration to cause small streams to flood. These estimates are based on the current soil moisture and stream flow conditions for the area. Flash Flood Guidance is routinely issued by National Weather Service (NWS) River Forecast Centers, and is used by NWS Weather Forecast Offices when issuing Flash Flood Watches and Warnings to the public. Note: Less rainfall is required to produce flash flooding in urban areas.





One-Hour Flash Flood Guidance


Latest 1-hour Flash Flood Guidance Graphic.



Three-Hour Flash Flood Guidance


Latest 3-hour Flash Flood Guidance Graphic.



Six-Hour Flash Flood Guidance


Latest 6-hour Flash Flood Guidance Graphic.



Flash Flood Guidance Text Products


Southern New England

Maine & New Hampshire

New York & Vermont

Headwater Guidance