National Weather Service United States Department of Commerce

Heavy Lake Effect Snow and Chilly in the East; Storms Return to the West this Weekend

Remnants of a powerful storm and current ice free Great Lakes is causing lingering heavy snow and some blizzard conditions to continue downwind of the Great lakes. Snow and wind will slowly diminish this weekend. Meanwhile, a new system will move south along the West Coast. Lower elevation rain with heavy mountain snow will overspread the West to the Rockies. 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.