Final Wyoming Water Supply Outlook for Water Year 2012

...Mountain snowpack across Wyoming lowered to below 40 percent of normal by early June…

...Summer water supply runoff will continue to below to well below normal for almost all of Wyoming’s basins…

…Wyoming reservoir storages continue to be above average for early June…

Central and southern Wyoming watersheds had below normal precipitation during May. Northern basins received normal to slightly above normal precipitation in May.  Mountain snowpack across Wyoming lowered to below  40 percent of normal by early June.  Snowpack "water" numbers and/or SWEs at the beginning of June were the highest across northern Wyoming—varying between 60 to 75 percent of normal.  SWEs across the rest of Wyoming varied from 7 to 25 percent of normal.

Almost of all of Wyoming’s major watersheds are expected to see below to well below average summer streamflow volumes.  The water supply runoff will vary from 13 to 70 percent of average across most of Wyoming’s basins.

Near normal (90 to 100 percent) summer snowmelt streamflow volumes are only expected across isolated watersheds across the northern and western Wyoming---to include Shell Creek, Pacific Creek, and Gros Ventre River.  

Reservoirs storages across Wyoming continue to be above average at 95 108 percent of normal for early June.

 The latest Wyoming water supply outlook graphic:

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