National Weather Service United States Department of Commerce

Major Storm Arriving Into The Western U.S.

A major Pacific storm system will arrive into the Pacific Northwest and produce locally heavy rain, heavy mountain snow, gusty winds and a slew of marine hazards. This significant storm will dig down the West Coast over the weekend into the Southwestern U.S. For Saturday and Sunday, expect heavy to excessive rainfall along the California coast and widespread heavy mountain snow across the West. Read More >

…Wyoming January precipitation was 92 to 97 percent of average...

...Current water year precipitation is averaging near 100 percent of normal across Wyoming…

…Mountain snowpack across Wyoming remains at 80 to 85 percent of average... 

Below normal snowmelt streamflow volumes are expected across major basins in Wyoming...

…Wyoming reservoir storages are 110 to 120 percent of average for February…

January precipitation totals across Wyoming were 92 to 97 percent of average. Precipitation numbers varied between 152 percent of normal over the Little Snake River Drainage (extreme southern Wyoming) to near 47 percent of normal over the Clarks Fork Yellowstone/Shoshone River Basin (northwestern Wyoming).  Current water year (October 2015 - January 2016) precipitation across Wyoming is near 100 percent of average. 

Mountain snowpack across Wyoming continues to be 80 to 85 percent of median by early February.  Snowpack "water" numbers and/or SWEs were the highest across basins in southern Wyoming—varying between 97 to 107 percent of median.  SWEs across basins in north central Wyoming varied between 48 to 65 percent of median.

Below normal (80 to 85 percent) snowmelt streamflow volumes are expected across almost all major basins across Wyoming.  Near average streamflow volumes are expected across portions of the Upper Bear and Upper North Platte Watersheds.  The Sweetwater, Powder, and Tongue River Basins are forecasted to have much below normal streamflow volumes during the upcoming snowmelt season.

Reservoirs storages across Wyoming are remained above average at 110 to 120 percent for February. 

The latest Wyoming water supply outlook graphic: