National Weather Service United States Department of Commerce

Tropical Storm Colin Pulls Away from the Coast; Severe Weather for Portions of Montana and Plains on Sunday

Tropical Storm Colin will continue to track away from the U.S. East Coast through Sunday. Meanwhile, severe weather potential for portions of Montana and the Plains are forecast through Sunday. Critical fire weather conditions to persist across the Great Basin and interior Alaska the remainder of the weekend. Heat will build for the Plains, Ohio and Tennessee Valleys and Great Lakes into Monday. 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.

 

 


Headwater Guidance Text Product

 

Headwater Guidance

 

The Flash Flood Guidance Text Products (BOSFFGMA, BOSFFGME and BOSFFGNY) were discontinued on April 1, 2019.