946
FGUS75 KBYZ 212345
ESFBYZ
MTC003-009-011-017-025-037-065-067-075-087-095-097-103-107-111-
WYC033-241800-
HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
445 PM MST FRI FEB 21 2025
..OVERLAND AND ICE JAM FLOODING POSSIBLE DUE TO SNOWMELT
A DEEP AND WET SNOWPACK EXISTS ACROSS THE FORECAST AREA. 1 TO 4
INCHES OF WATER IS LOCKED IN THIS SNOWPACK. WARMER TEMPERATURES
FORECAST OVER THE COMING DAYS WILL INCREASE SNOWMELT, RELEASING
THIS WATER. WITH THE GROUND FROZEN, WATER WILL NOT BE ABLE TO SOAK
IN AND WILL RUN OFF. WATER FLOWING OVERLAND AND ACCUMULATING IN
LOW LYING AREAS MAY RESULT IN LOCALIZED FLOODING. WATER FLOWING
INTO CREEKS AND RIVERS WILL INCREASE THE POTENTIAL FOR ICE JAM
DEVELOPMENT AND MAY RESULT IN ADDITIONAL FLOODING NEAR WATERWAYS.
LOCALIZED IMPACTS FROM SNOWMELT MAY BE ONGOING OVER THE WESTERN
FOOTHILLS AND VALLEYS. MORE WIDESPREAD IMPACTS ARE POSSIBLE BY THE
END OF THE WEEKEND INTO EARLY NEXT WEEK AS OVERNIGHT LOW
TEMPERATURES HOVER ABOVE FREEZING, PRODUCING 24 HOUR SNOWMELT
POTENTIAL.
IMPACTS...WATER MAY ACCUMULATE NEAR HOME FOUNDATIONS INCREASING
THE CHANCE OF BASEMENT FLOODING. PLUGGED CULVERTS, DITCHES, AND
STORM DRAINS MAY RESULT IN WATER ON AREA ROADWAYS AT TIMES. WATER
FLOWING INTO CREEKS AND STREAMS WILL INCREASE THE POTENTIAL FOR
ICE JAM DEVELOPMENT WITH ADDITIONAL FLOODING HAZARDS. UNPAVED
ROADS MAY SUDDENLY THAW AND BECOME MUDDY AND IMPASSABLE. THE
SEVERITY OF THE IMPACTS WILL DEPEND ON HOW QUICKLY THE SNOWPACK
MELTS, HOW FAST THE GROUND THAWS, AND ANY PRECIPITATION.
PREPARATION...WHILE FLOODING IS NOT IMMINENT, IF YOU HAVE NOT
ALREADY DONE SO, NOW IS THE TIME TO MOVE EQUIPMENT AND LIVESTOCK
OUT OF LOW LYING AREAS, AND AWAY FROM WATERWAYS. MOVE ANY HEAVY
ACCUMULATIONS OF SNOW AWAY FROM STRUCTURES AND TAKE STEPS TO
PREVENT WATER FROM MAKING IT INTO BASEMENTS. CLEAR ANY OUTSIDE
DRAINS OF SNOW. DO NOT DRIVE OVER FLOODED ROADWAYS AS THE ROADBED
MAY BE WASHED OUT. BE ESPECIALLY CAREFUL DRIVING AT NIGHT WHEN
WATER COVERED ROADWAYS ARE LESS VISIBLE.
STAY TUNED TO THE FORECAST FOR THE LATEST TEMPERATURE AND
PRECIPITATION TRENDS, ALONG WITH ANY WARNINGS OR ADVISORIES THAT MAY
BE ISSUED. PLEASE REPORT ANY FLOODING TO LOCAL LAW ENFORCEMENT AND
HAVE THEM RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE.
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