443  
FGUS75 KBYZ 131945  
ESFBYZ  
MTC003-009-037-067-095-097-107-111-WYC033-152200-  
 
HYDROLOGIC OUTLOOK  
NATIONAL WEATHER SERVICE BILLINGS MT  
145 PM MDT TUE MAY 13 2025  
   
..WIDESPREAD PRECIPITATION INTO THURSDAY  
 
RECENT WARM TEMPERATURES AND INCREASED SNOWMELT HAVE AREA RIVERS AND  
STREAMS RUNNING HIGH. WHILE DECREASING TEMPERATURES WILL BRING AN  
END TO MOST OF THE SNOWMELT IN THE MOUNTAINS, WIDESPREAD  
PRECIPITATION IS EXPECTED INTO THURSDAY. SNOW IS EXPECTED TO FALL  
ABOVE 7000 FEET, WITH PERIODS OF SHOWERS AND WEAK THUNDERSTORMS  
BRINGING BETWEEN 0.5 TO 2.0 INCHES OF RAINFALL OVER THE LOWER  
ELEVATIONS AND FOOTHILLS.  
 
RIVERS AND STREAMS WILL REMAIN HIGH, AND ADDITIONAL RISES ARE  
POSSIBLE DUE TO THE EXPECTED PRECIPITATION. WHILE WIDESPREAD  
FLOODING OF RIVERS AND STREAMS IS NOT EXPECTED, LOCALIZED MINOR  
FLOODING IMPACTS ARE POSSIBLE. PLEASE CONTINUE TO MONITOR THE  
FORECAST OVER THE COMING DAYS.  
 
THE CONTINUED HIGH WATER WILL INCREASE EROSION, MAKING STREAMBANKS  
UNSTABLE. PLEASE STAY WELL AWAY FROM STREAMBANKS WHEN WATER IS  
RUNNING FAST, AND BE ESPECIALLY VIGILANT WITH CHILDREN. EROSION WILL  
UNDERCUT THE BANK AND CAN BREAK OFF TAKING THE BANK AND ANYONE  
STANDING ON IT INTO A VERY COLD RAGING CURRENT. FOR THOSE PLANNING  
RECREATION ACTIVITIES ON OR NEAR WATERWAYS, BE PREPARED FOR CHANGING  
CONDITIONS AND HIGHER FLOWS.  
 
STAY TUNED TO THE FORECAST FOR ANY WATCHES, ADVISORIES, OR WARNINGS.  
PLEASE REPORT ANY FLOODING TO LOCAL LAW ENFORCEMENT AND HAVE THEM  
RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE.  
 
 
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