957
NZUS99 KBOI 111626
TXTSFD
IDAHO STATE FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
926 AM MST SUN JAN 11 2026
A STRONG RIDGE OF HIGH PRESSURE WILL REMAIN THE DOMINANT WEATHER FEATURE ACROSS
IDAHO THROUGH THE UPCOMING WEEK, RESULTING IN PROLONGED DRY AND STABLE
CONDITIONS FOR MUCH OF THE STATE. THIS PATTERN WILL SUPPORT THE STRENGTHENING
OF TEMPERATURE INVERSIONS, TRAPPING COLD AIR AND POLLUTANTS IN THE LOWER
VALLEYS WHILE MOUNTAIN LOCATIONS EXPERIENCE UNSEASONABLY MILD TEMPERATURES. AIR
STAGNATION ADVISORIES ARE CURRENTLY IN EFFECT FOR MANY VALLEY LOCATIONS IN
SOUTHWEST IDAHO AND MAY NEED TO BE EXPANDED AS MIXING HEIGHTS REMAIN LOW. AREAS
OF DENSE FOG AND LOW STRATUS WILL LIKELY DEVELOP NIGHTLY IN THE FAVORED BASINS
OF THE SNAKE RIVER PLAIN AND THE TREASURE VALLEY, POTENTIALLY LINGERING INTO
THE AFTERNOON HOURS. A WEAK WEATHER DISTURBANCE MOVING OVER THE TOP OF THE
RIDGE IS FORECAST TO BRUSH THE IDAHO PANHANDLE AND NORTHERN MOUNTAINS LATE
MONDAY INTO TUESDAY. THIS SYSTEM WILL BRING INCREASED CLOUD COVER AND A SLIGHT
CHANCE OF LIGHT RAIN OR HIGH ELEVATION SNOW TO NORTHERN IDAHO, BUT
PRECIPITATION AMOUNTS WILL BE MINIMAL. THE RIDGE IS EXPECTED TO AMPLIFY AGAIN
BY MID WEEK, MAINTAINING DRY CONDITIONS AND VALLEY INVERSIONS STATEWIDE THROUGH
NEXT WEEKEND.
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