Final Wyoming Spring Snowmelt Flood Potential Outlook---May 8th

Quick Synopsis:


Mountain snowpack and associated snow water equivalents (SWEs) across Wyoming were 90 to 95 percent of average as of May 8th.   Most of the snowpack below 8,000 feet has already melted out.  SWEs at the peak snowmelt runoff elevations (8,000’ – 9,500’) were the highest across northern Wyoming at around 90 to 120 percent of normal; while across southern Wyoming, SWEs have increased to 85 to 100 percent of average at the peak snowmelt runoff elevations.

This outlook is based on various diverse hydrological factors such as snow water equivalents (SWEs) in the mountain snowpack, basin morphology (i.e. how basins respond to snowmelt), extent of burn scars from 2012 fires, amount of bark beetle kill, and likely temperature and precipitation trends during late spring/early summer



Moderate to High potential for flooding associated with snowmelt is expected across various headwater streams along the Powder River Drainage as well as along eastern portions of the Big Horn Basin.  Streams with the highest potential for flooding include the Middle Fork of the Powder River (Kaycee) , Medicine Lodge Creek ,Ten Sleep Creek (Ten Sleep), and Clear Creek (Buffalo)…


 …All other of headwater basins across Wyoming can expect a generally low potential for flooding due to springtime snowmelt...


This is the last graphical outlook and analysis for 2013.



Other hydrological information for Wyoming can be found at the NOAA hydrology website:


Monthly Wyoming Hydrologic Summary and Graphics:

(updated monthly around the 15th of every month)


Wyoming Drought Information Page:

(updated at least once a month)


Wyoming Graphical Water Supply Outlook:

(updated by the 15th of every month—January-June)


Wyoming Average Precipitation by Basin:

 (updated monthly)


Wyoming Spring Snowmelt Runoff Flood Potential Graphic:

(updated by the 25th of the month---January-May)


Current and Forecast Wyoming Streamflows and/or River Stages:


The current Wyoming Spring 2013 Snowmelt Runoff Flood Potential Outlook graphic:


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