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FGUS75 KBYZ 131534
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MTC003-009-037-067-095-097-107-111-WYC033-142100-
HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
934 AM MDT WED MAY 13 2026
..MOUNTAIN SNOW MELT BRINGING HIGHER STREAM FLOWS
RECENT VERY WARM TEMPERATURES HAS ENHANCED SNOWMELT IN THE MOUNTAINS
THIS WEEK, RESULTING IN SIGNIFICANTLY HIGHER FLOWS ON AREA WATERWAYS.
FLOODING IS NOT EXPECTED AT THIS TIME DUE TO MARGINAL REMAINING
SNOWPACK IN THE MIDDLE ELEVATIONS BETWEEN 6000 AND 8000 FEET. RIVERS
THAT HAVE SEEN INCREASED FLOWS INCLUDE THE YELLOWSTONE, SHIELDS,
BOULDER, STILLWATER, AND CLARKS FORK. SOME SMALLER STREAMS FLOWING
OUT OF THE MOUNTAINS HAVE ALSO EXPERIENCED RISES.
LOOKING AHEAD, COOLER TEMPERATURES ARE IN STORE FOR THE END OF THE
WEEK. IN FACT, A SEASONABLY COLD WEATHER SYSTEM MAY BRING FREEZING
TEMPERATURES AT HIGH ELEVATIONS AND POTENTIAL SNOWFALL THIS WEEKEND
INTO EARLY NEXT WEEK. THE COLDER WEATHER WILL SLOW OR BRIEFLY HALT
THE HIGH ELEVATION SNOW MELT.
THOSE WITH INTERESTS ALONG FOOTHILLS WATERWAYS SHOULD BE PREPARED FOR
HIGHER WATER LEVELS, AND MOVE PROPERTY AND LIVESTOCK AWAY FROM
RIVERS, STREAMS, AND LOW LYING AREAS.
RUNOFF MAY FILL CULVERTS, DITCHES, AND STORM DRAINS CAUSING WATER TO
FLOW OVER FOOTHILLS 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 FASTER, AND THE WATER IS VERY COLD.
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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