781
NZUS99 KBOI 230259
TXTSFD
IDAHO STATE FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
859 PM MDT WED APR 22 2026
UNSETTLED AND SIGNIFICANTLY COOLER CONDITIONS WILL IMPACT THE STATE THROUGH THE
MIDDLE OF THE WEEK AS A STRONG LOW-PRESSURE SYSTEM MOVES THROUGH THE REGION.
WIDESPREAD RAIN AND MOUNTAIN SNOW WILL CONTINUE THROUGH THURSDAY, WITH SNOW
LEVELS DROPPING TO BETWEEN 3,000 AND 5,000 FEET, LIKELY LEADING TO WINTER
DRIVING CONDITIONS OVER MOUNTAIN PASSES IN THE IDAHO PANHANDLE AND CENTRAL
IDAHO. HEAVY PRECIPITATION MAY CAUSE LOCALIZED URBAN AND SMALL STREAM FLOODING,
PARTICULARLY ACROSS THE PALOUSE AND NORTHERN MOUNTAINS, WHILE THE KOOTENAI
RIVER REMAINS NEAR FLOOD STAGE. STRONG WESTERLY WINDS WITH GUSTS OF 30 TO 45
MPH ARE EXPECTED ACROSS SOUTHERN IDAHO THROUGH THURSDAY, CREATING DIFFICULT
TRAVEL FOR HIGH-PROFILE VEHICLES. A RISK OF FROST OR A HARD FREEZE EXISTS FOR
AGRICULTURAL AREAS IN THE SNAKE RIVER PLAIN AND TREASURE VALLEY ON FRIDAY AND
SATURDAY MORNINGS AS OVERNIGHT TEMPERATURES DIP INTO THE 20S AND LOW 30S.
SHOWERY WEATHER PERSISTS THROUGH THE WEEKEND WITH TEMPERATURES REMAINING 5 TO
10 DEGREES BELOW NORMAL BEFORE A GRADUAL WARMING TREND BEGINS EARLY NEXT WEEK.
CONDITIONS ARE EXPECTED TO TREND DRIER BY MID-WEEK AS HIGH PRESSURE BEGINS TO
BUILD BACK OVER THE PACIFIC NORTHWEST.
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