May 2008 Wyoming Water Supply Outlook

...Above normal water supply numbers continue to be forecasted over the Snake, Upper Yellowstone, Powder, Tongue,  Little Snake, and Laramie Watersheds...

  ...Below normal snowmelt runoff volumes continue to be expected over the Upper Green, Lower Green, and Sweetwater Drainages...

 ...Below normal April precipitation has caused water supply numbers along the Wind and Big Horn Rivers to drop to near 80 percent of average... 

Snowpack "water" numbers and/or snow water equivalents (SWEs) were averaging near 109 percent of normal by early May across Wyoming.  There were no significant increases or decreases in SWEs across the major watersheds in Wyoming during April and into early May.

 Volume forecasts along the Wind and Bigh Horn Rivers have dropped to near 80 percent of normal due to below normal preciptation during April.   The inflow volume forecast for Boysen Reservoir dropped to 77 percent of normal after a forecast of 96 percent of normal during April.

The Upper Green and Lower Green Watershed water supply forecasts continue to point to below average snowmelt streamflow volumes.

 All other major watersheds across Wyoming are expected to see normal to above normal water supply numbers for the spring and summer.   

 The latest Wyoming water supply outlook graphic:









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