Wyoming Water Supply Outlook---issued May 14, 2012

...Above normal mountain temperatures and much below normal mountain precipitation trends continued during April---Mountain snowpack “water” numbers continued to drop and remain well below normal...

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

…Near normal streamflow volumes are expected across northwestern Wyoming watersheds...

…Wyoming reservoir storages continue to be above average in early May…

The above normal mountain temperatures and below average mountain precipitation trends continued in April.  These trends have continued to drastically lower the snow water equivalents (SWEs) in the Wyoming mountain snowpack during April and into early May. Mountain snowpack across Wyoming has lowered to 45 to 60 percent of normal by early May.  Snowpack "water" numbers and/or SWEs figures at the beginning of May were the highest across northern Wyoming—varying between 70 to 85 percent of normal.  SWEs across the rest of Wyoming varied from 30 to 40 percent of normal.

Near normal (90 to 100 percent) snowmelt streamflow volumes are expected across major basins across northwestern Wyoming---which includes the Upper Yellowstone Basin as well as portions of the Snake and Shoshone 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 (30 to 55 percent of normal) during the upcoming spring and summer runoff.

Reservoirs storages across Wyoming continue to be above average at 105 120 percent of normal in early May.

 The latest Wyoming water supply outlook graphic:



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