Wyoming Water Supply Outlook---issued April 9, 2012

...Above normal temperatures and much below normal precipitation during March has lowered mountain snowpack “water” numbers to well below normal...

...Below to well below normal water supply numbers are forecasted over central and southern Wyoming basins…

…Normal to just above normal streamflow volumes are expected across northern Wyoming watersheds...

…Wyoming reservoir storages continue to be above average in April…

Above normal mountain temperatures and below average mountain precipitation in March has drastically lowered the snow water equivalents (SWEs) in the Wyoming mountain snowpack.  Mountain snowpack across Wyoming has lowered to 67 to 75 percent of normal by early April.  Snowpack "water" numbers and/or SWEs figures at the beginning of April were the highest across northern Wyoming—varying between 85 to 95 percent of normal.  SWEs across the rest of Wyoming varied from 50 to 75 percent of normal.

Normal to just above normal (90 to 105 percent) snowmelt streamflow volumes continue to be expected across major basins across northern  Wyoming---which includes the Shoshone, the Powder, the Tongue, and portions of the Snake Watersheds.

Major watersheds across southern and central Wyoming, to include the Upper Bear, the Upper North Platte, the Green River, and the Wind River Basins, are expected to see below to well below average streamflow volumes (50 to 75 percent of normal) during the upcoming spring and summer runoff.

Reservoirs storages across Wyoming continue to be above average at 100 - 110 percent in April.

 The latest Wyoming water supply outlook graphic:



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