March 2009 Wyoming Spring Snowmelt Flood Potential Outlook

Moderate-High Snowmelt Flood Potential for:   

The Powder/Tongue Headwater Basins

Portions of the Little Snake River Basin

Moderate Snowmelt Flood Potential for:  

Laramie Headwater Basins (up to Laramie)

The Upper North Platte Basin…to include the Encampment River (from headwaters up to Saratoga)

Headwater locations of the Tongue and Powder Watersheds continued to have well above normal snow water equivalents (SWEs) at the beginning of March. The mountain snowpack along the Little Snake Drainage continued to have 95 to 120 percent of normal SWEs at the beginning of March.  The Laramie and the Upper North Platte Watersheds had just above normal SWEs by the beginning of March.  All other headwater basins in Wyoming had near normal to just below normal SWEs by the beginning of the month.

The March updated spring 2009 snowmelt flood potential outlook calls for a moderate-high potential for headwater snowmelt flooding across the Tongue, Powder, Little Snake Basins.  A moderate snowmelt flood potential is expected for headwater locations along the Laramie and Upper North Platte Watersheds--to include the Encampment River.  All other headwater locations across Wyoming can expect a generally low potential for flooding due to springtime snowmelt.

Note:  A much higher flood potential can occur at any location during periods of:
   1) Higher than normal temperatures occurring during snowmelt.
   2)  Extended heavy rainfall occurring over a melting snowpack.

March 2009 Wyoming Spring Snowmelt Flood Potential Outlook Graphic:


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