Wyoming Drought Information and Graphics--updated March 25, 2008

…Wyoming snowpack up to 99 percent of average…

 …March water supply forecast numbers still showing near average above average snowmelt streamflow volumes for 2008… 

 …All major basins across Wyoming had near normal to above normal precipitation totals for October 2007 through February 2008…


 Snow water equivalents (SWEs) in the Wyoming snowpack continued to be near normal to above normal during February into early March. Snowpack averages across Wyoming reached near normal (99% of the 30-yr normal) by early March.  The SWE averages across Wyoming are still running about 20 to 25 percent greater than this time last year.  This is good news since there is a least 2 full months to go in the snowpack “accumulation” season--especially across basins east of the continental divide.

The true measure of drought conditions in Wyoming is the amount of water that runs off into streams and lakes from the mountain snowpack.   The latest water supply forecast indicates the most of the state will see normal to above normal steamflow volumes during the spring runoff.  Inflows to almost all of the major reservoirs this spring and summer are expected to be near normal. The long-range temperature outlook still indicates that there is a 30-40 percent chance of a warmer than normal spring--especially for basins in southern Wyoming. If this temperature forecast pans out (coinciding with an above average snowpack), than there is still a good chance for above normal steamflows across Wyoming--which will help fill the state’s reservoirs.

Precipitation totals across the major drainages across Wyoming during the current water year (October ‘07 - February ‘08) continued to be near normal to above normal. The wettest part of the year, for watersheds east of the continental divide, is during April through June.   The latest long-range predictions (through June) for precipitation across Wyoming indicate that there is will be no above or below normal precipitation trends developing for the region.

The latest drought outlook through June 2008 indicates that most of central and western Wyoming will continue to see improvement in current drought conditions; while eastern and southeastern Wyoming will see current drought conditions persist.

 For the rest of the Wyoming Drought Information Statement and Graphics (in .PDF format)---please go to:


For additional drought graphics and information---please refer to:


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