391
FXUS65 KBOI 172117
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
217 PM MST MON FEB 17 2025
SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT
UPPER TROUGH AND
ASSOCIATED LIGHT RAIN AND SNOW WILL EXIT OUR CWA SLOWLY EASTWARD
TONIGHT FOLLOWED BY PARTIAL CLEARING. FURTHER SNOWFALL OF 1 TO 3
INCHES TONIGHT IN THE NORTHERN MOUNTAINS. LINGERING LOW-LEVEL
MOISTURE WILL PRODUCE AREAS OF FOG IN THE VALLEYS OVERNIGHT AND
TUESDAY MORNING. HIGH PRESSURE ALOFT IN THE EASTERN PACIFIC
WILL MOVE INLAND TUESDAY AND OVER OUR CWA TUESDAY NIGHT,
QUICKLY FOLLOWED BY THE NEXT UPPER TROUGH WITH MORE RAIN AND
SNOW LATE TUESDAY NIGHT THROUGH WEDNESDAY. THAT TROUGH SHOULD
BE THE LAST ONE FOR AT LEAST SEVERAL DAYS. TEMPERATURES WILL
AVERAGE SLIGHTLY BELOW NORMAL THROUGH WEDNESDAY NIGHT. BREEZY
SOUTHWEST WINDS 15 TO 25 MPH WILL BLOW ACROSS THE SNAKE BASIN
EAST OF BOISE TONIGHT THROUGH TUESDAY NIGHT THEN DIMINISH.
LIGHTER WINDS WEDNESDAY EXCEPT NEAR JEROME/ID WHERE NORTHEAST
WINDS 10 TO 15 MPH WILL BLOW IN FROM THE COLD CAMAS PRAIRIE.
LONG TERM...THURSDAY THROUGH MONDAY
NORTHERLY FLOW IN ADVANCE
OF AN UPPER LEVEL RIDGE WILL CONTINUE THROUGH THURSDAY, WITH
SHOWERS DECREASING DURING THE DAY AND THEN ENDING OVERNIGHT. THE
RIDGE AXIS WILL MOVE BY QUICKLY FRIDAY, BRINGING A COOL AND DRY
DAY. WESTERLY FLOW THEN TAKES OVER, SLOWLY INCREASING MOISTURE
IN THE AREA. SATURDAY SHOULD REMAIN DRY, BUT A CHANCE OF SHOWERS
ENTERS THE FORECAST SATURDAY NIGHT THROUGH MONDAY. SNOW LEVELS
SHOULD BE HIGH ENOUGH FOR THE TYPICAL MOUNTAIN-SNOW AND VALLEY-
RAIN WHEN PRECIPITATION STARTS (4000-5000 FEET MSL), WITH
LEVELS RISING TO AROUND 7000 FEET MSL BY LATE SUNDAY.
TEMPERATURES ARE FORECAST TO REMAIN BELOW NORMAL THROUGH
SATURDAY, THEN WARM TO NEAR-NORMAL SUNDAY AND ABOVE- NORMAL
MONDAY. MODELS ARE IN ABOVE-AVERAGE AGREEMENT THROUGH THE LONG
TERM, MAKING THIS A RELATIVELY HIGH-CONFIDENCE FORECAST.
AVIATION
SCATTERED RAIN AND SNOW SHOWERS THIS AFTERNOON WILL
BECOME ISOLATED TONIGHT. CONDITIONS SHOULD BE MVFR/IFR IN RAIN,
AND IFR/LIFR WITH SNOW AND/OR FOG/LOW CEILINGS. SNOW LEVELS
3500-4500 FEET MSL THIS AFTERNOON, FALLING TO 2500-3500 FEET
MSL OVERNIGHT. MOUNTAINS OBSCURED. SURFACE WINDS: SW TO W 5-15
KT WITH GUSTS 20-25 KT AFTER 18Z, STRONGEST FROM KMUO SOUTH AND
EAST TOWARD KJER AND KTWF. WINDS ALOFT AT 10KFT MSL: NW 20-30
KT.
KBOI...VFR/MVFR IN SCATTERED SHOWERS THROUGH 00Z, THEN IFR/LIFR
IN FOG AND/OR LOW CEILINGS POSSIBLE TONIGHT. SURFACE WINDS:
VARIABLE LESS THAN 9 KT THROUGH TONIGHT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...LC
LONG TERM....SP
AVIATION.....SP
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