National Weather Service United States Department of Commerce

Cold, Wintry Blast to Impact the Eastern States; Air Quality Issues Continue in the Northwest

The Arctic Storm that has impacted the Central U.S. will now move into the East with the potential for record cold temperatures, gusty winds, and widespread areas of snow or rain and snow mixed. Heavy lake effect snows will continue for some Great Lakes areas. Meanwhile, in the West, record warmth continues; and stagnant air remains entrenched in the Northwest. 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.