Wyoming Drought Information and Graphics--updated April 22, 2008

   …Wyoming snowpack up to 105 percent of average…

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

 …All major river basins across Wyoming continue to have near normal to above normal precipitation totals for October 2007 through March 2008…

 …Areas east of the continental divide beginning to see a rather dry spring….


Snow water equivalents (SWEs) in the Wyoming snowpack continued to be near normal to above normal during March into the middle of April. Snowpack averages across Wyoming reached above normal (105% of the 30-yr normal) by mid-April.  One year ago the SWE averages across Wyoming were only 67 percent of normal.

However, areas (especially in the basins) east of the continental divide are beginning to experience a rather dry spring.  Lander has only recorded 0.12 of an inch of precipitation in April and there are not any big precipitation “producing” storms expected for the rest of the month.  This means that Lander has a good chance for having the 2nd driest April on record--since records began in 1919.   Also, several locations across central and eastern Wyoming have only recorded 60 percent or less normal precipitation during January through March.  The next 5 weeks are crucial for precipitation accumulation across dry areas east of the continental divide.  The latest long-range predictions for precipitation across Wyoming indicate that there is a developing trend (at least a 30 to 40 percent chance) for below normal precipitation across the state during May through July.

Wyoming’s water supply still looks like it will be solid for the beginning of the spring runoff and into early summer. 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. However, the long-range temperature outlook indicates that there is a 30-40 percent chance of a warmer than normal summer for most of central and western Wyoming.  This is may initially help fill the state’s reservoirs; but a warmer than average summer may not carry the state’s irrigation water supply deep into summer and into early fall.  

The latest drought outlook through July 2008 indicates that most of central and eastern Wyoming will continue to see some limited improvement in current drought conditions.

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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