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Hydrologic Outlook

National Weather Service Riverton WY

1159 AM MDT Sat May 31 2025



...Warm Temperatures this Weekend will increase high-elevation 

snowmelt and flooding potential...



Temperatures are expected to reach the mid to upper 80s this 

weekend. Sunday will be the warmest day, with highs in the upper 80s 

to low 90s across many locations. Low temperatures will also remain 

well above freezing with low temperatures in the 40s at elevations 

above 9500 feet. These warm temperatures will continue to lead to an 

increase in the rate of mountain snowmelt.



Most mountain snowpack below 9500 feet has melted out, however, 

high-elevation mountain snow water equivalent (SWE) above that level 

still remains. With the expected warm temperatures, a significant 

portion of that high-elevation snowpack is expected to continue to 

melt through Sunday night. Minor flooding of small streams and 

creeks fed by mountain snowmelt is thus possible through Monday. 

Highest stream flows and crests are expected to occur Sunday morning 

and Monday morning.



Stay tuned for the latest river forecasts. Remember, if you 

encounter a flooded roadway, turn around don't drown. You never know 

what road conditions are hidden under the water.



$$



Hensley