Great Falls, MT Warnings, Watches and Advisories

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Hydrologic Outlook

Hydrologic Outlook issued May 27 at 11:47AM MDT by NWS Billings MT

ESFBYZ Warm temperatures today through Wednesday will result in snowmelt in the 6000-8000 foot range of the Beartooths/Absarokas and Northeast Bighorn Mountains, resulting in high flows on area waterways. While flooding is not imminent, many waterways could approach bankfull. Snow monitoring sites in the high country showed that the snowpack was running above average for this time of year. The snowstorm on May 23, 2024 added more snow to the mountains, and snow in the 6000-8000 foot range will have an easier time melting out due to warm temperatures. High temperatures for today through Wednesday of this week will be in the upper 50s to around 60 degrees in the mountains/foothills. Low temperatures will remain above freezing each night in the mid 30s to mid 40s. These temperatures will increase the potential for a rapid snowmelt this week. Smaller streams and creeks flowing out of the mountains will experience rises first, with larger rivers in the lower elevations seeing increased flows a few days after the hot temperatures arrive. Those with interests along area waterways should be prepared for high water levels and move property and livestock away from rivers, streams, and low lying areas. Bank erosion will make shorelines unstable. Do not walk near streambanks as the underlying soil may be eroded. Do not allow children to play near the water's edge. Runoff may fill culverts, ditches, and storm drains causing water to flow over roadways potentially causing damage. Do not drive over flooded roadways, Turn Around Don't Drown. Recreationists in the mountains and foothills should be prepared for changing conditions and use extra caution when near waterways. Flows will be fast, and the water is cold. Fishing access sites may become inundated by high water. Stay tuned to the forecast. Please report any flooding to local law enforcement and have them relay the report to the National Weather Service.

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Area
Carbon, MT; Park, MT; Stillwater, MT; Sweet Grass, MT; Sheridan, WY
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