Wyoming Drought Information and Graphics--updated February 21, 2008

…Wyoming snowpack up to 95 percent of average…

 …February water supply forecast numbers indicate 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 January 2008…

 The trend of increased snow water equivalents (SWEs) in the Wyoming snowpack continued into January and into early February. Snowpack averages across Wyoming increased to near normal (95% of the 30-yr normal) during January and into early February.  The greatest gains of SWE averages in the mountain snowpack during January and into the middle of February were over the Wind and Upper Bear River Drainages.  The “water” in the mountain snowpack across the Wind River Basin jumped from being only 80 to 85 percent of average in early January to 96 percent of average by the middle of February.   This is good news since there is a least a full 3 months to go in the snowpack “accumulation” season--especially over 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 has been indicating (for 3 months now) that there is a 30-40 percent chance of a warmer than normal spring. If this temperature forecast pans out (coinciding with an above average snowpack), than there is 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 - January ‘08) were 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 May) 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 May 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 limited improvement to current drought conditions.

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

   http://www.crh.noaa.gov/images/riw/hydro/drought_info.pdf

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

    http://www.crh.noaa.gov/riw/hydro/drought.php



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