Wyoming Water Supply Outlook--April 5, 2013

...March basin precipitation was 60 percent of average across Wyoming…

…Current water year (October 2012 – March 2013) basin precipitation was 75 - 80 percent of average across Wyoming…

…Mountain snowpack across Wyoming continues to be around 80 percent of average... 

Below normal streamflow volumes continue to be expected across a majority of Wyoming’s watersheds...

…Wyoming reservoir storages continue to be near average for early April…

March precipitation across Wyoming was 60 percent of average. Precipitation numbers varied between 90 percent of normal over the Snake River Basin to only 40 percent of normal over the Crow Creek/Lodgepole Creek Basins (extreme southeast Wyoming). 

Water year 2013 precipitation totals (October 2012 – March 2013) were 75 to 80 percent of average.  The Snake River Watershed had the highest average at 95 percent; while the Belle Fourche Watershed had the lowest average at 61 percent. 

Mountain snowpack across Wyoming continues to be around 80 percent of normal by early April.  Snowpack "water" numbers and/or SWEs continue to be the highest across northern Wyoming—varying between 80 to 90 percent of normal.  SWEs were again the lowest across southern Wyoming---varying from 65 to near 80 percent of normal.

Streamflow snowmelt volumes are expected to be below normal across a majority of basins across Wyoming.  Slightly below normal (90 percent) streamflow volumes are expected across portions of the Powder, Snake, and Shoshone Watersheds.

Well below normal (45 to 70 percent) spring and early summer snowmelt volumes are expected for almost all major watersheds across southern Wyoming.

Reservoirs storages across Wyoming continue to be near average for early April.

The latest Wyoming water supply outlook graphic:



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