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NZUS99 KBOI 231731 RRA
TXTSFD
IDAHO STATE FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1030 AM MST TUE DEC 23 2025
FOR TUESDAY, A WARM FRONT SHIFTING NORTHWARD WILL MAINTAIN HIGH SNOW
LEVELS BETWEEN 6000 AND 8000 FEET, KEEPING MOST VALLEY PRECIPITATION
IN THE FORM OF RAIN. HOWEVER, TRAPPED COLD AIR IN THE VALLEYS OF THE
SALMON AREA AND THE CLEARWATER MOUNTAINS WILL LIKELY SUPPORT A MESSY
WINTRY MIX OF SNOW AND FREEZING RAIN, CREATING SLICK TRAVEL
CONDITIONS. BY WEDNESDAY, A VIGOROUS COLD FRONT WILL SWEEP ACROSS
THE STATE, BRINGING WIDESPREAD MODERATE TO HEAVY RAIN AND INCREASING
SURFACE WINDS, WITH GUSTS POTENTIALLY REACHING ADVISORY CRITERIA IN
SOUTHERN IDAHO. SNOW LEVELS ARE FORECAST TO GRADUALLY LOWER BEHIND
THIS FRONT, DROPPING TO 3000 TO 5000 FEET BY THURSDAY AND FRIDAY.
THIS TRANSITION WILL BRING A MORE DEFINED SHIFT TO SNOW FOR MOUNTAIN
PASSES. LOOKING TOWARD THE WEEKEND, A DEEP UPPER LEVEL TROUGH WILL
EXIT TO THE EAST ON SATURDAY, ALLOWING A RIDGE TO BUILD OVERHEAD.
THIS SHIFT SHOULD LEAD TO A BRIEF PERIOD OF DRIER CONDITIONS AND
MORE SEASONAL TEMPERATURES BY SUNDAY AND MONDAY, THOUGH INCREASING
HEIGHTS ALOFT MAY PROMOTE THE DEVELOPMENT OF VALLEY INVERSIONS AND
PATCHY FOG EARLY NEXT WEEK.
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