045
NZUS99 KBOI 280404
TXTSFD
IDAHO STATE FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
904 PM MST SAT DEC 27 2025
HIGH PRESSURE WILL BUILD OVER IDAHO BEGINNING SUNDAY AND IS EXPECTED TO
DOMINATE THE WEATHER PATTERN THROUGH EARLY WEDNESDAY. THIS WILL RESULT IN
GENERALLY DRY CONDITIONS AND LIGHT WINDS ACROSS THE STATE. THE STABLE
ATMOSPHERE WILL LIKELY LEAD TO THE FORMATION OF STRONG VALLEY TEMPERATURE
INVERSIONS, RESULTING IN AREAS OF FOG, LOW STRATUS, AND POTENTIAL AIR
STAGNATION ISSUES IN THE VALLEYS WHILE MOUNTAINS REMAIN MOSTLY SUNNY. THE HIGH
PRESSURE RIDGE IS FORECAST TO WEAKEN AND SHIFT EASTWARD BY LATE WEDNESDAY AS A
LOW PRESSURE GRADUALLY STEERS IN FROM THE NORTHWEST COAST. THIS WILL ALLOW A
RETURN TO AN UNSETTLED PATTERN WITH INCREASING CHANCES FOR MOUNTAIN SNOW AND
VALLEY RAIN OR SNOW SHOWERS THURSDAY AND FRIDAY.
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