184
FXUS65 KBOI 190350
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
850 PM MST TUE FEB 18 2025
DISCUSSION
BRIEF UPPER RIDGING TONIGHT BEFORE THE NEXT
PACIFIC STORM COMES IN WEDNESDAY MORNING. ONLY MID AND HIGH
CLOUDS OVER OUR CWA THIS EVENING BUT PATCHY FOG WILL FORM IN
THE VALLEYS LATER TONIGHT. LIGHT SNOW WILL START IN EASTERN
OREGON IN THE PRE-DAWN WEDNESDAY, THEN IN WESTERN ID AROUND
SUNRISE. SNOW SHOULD QUICKLY CHANGE TO RAIN IN THE WESTERN ID
VALLEYS WEDNESDAY MORNING THEN POSSIBLY BACK TO SNOW BEFORE
ENDING WEDNESDAY NIGHT. NO SNOW ACCUMULATION IS NOW EXPECTED
IN THE UPPER TREASURE VALLEY, BUT THE LOWER TREASURE VALLEY
MAY GET AN INCH OF MIXED SNOW AND FREEZING RAIN WEDNESDAY
MORNING BEFORE CHANGING TO RAIN. WILL UPDATE ACCORDINGLY.
THE REST OF THE CURRENT FORECAST LOOKS GOOD.
AVIATION
MAINLY VFR TONIGHT, EXCEPT IN FOG AND/OR LOW
CEILINGS AFFECTING KONO/KEUL AND SURROUNDING AREAS. WIDESPREAD
RAIN/SNOW WILL MOVE INTO E OREGON AFTER WED/09Z, SW IDAHO AFTER
WED/14Z. MVFR TO LIFR VIS/CEILINGS WITH PRECIP. MOUNTAINS
OBSCURED. SNOW LEVELS: 2500- 4000 FT MSL, RISING TO 3500-5000
FT BY MID-DAY WED. SLIGHT CHANCE (15%) OF FREEZING RAIN IN
E-CENTRAL OREGON AND W SNAKE PLAIN WITH THE ONSET OF PRECIP.
SURFACE WINDS: E TO S 5-15 KT, BECOMING SE TO SW 10-20 KT WITH
GUSTS TO 20-30 KT WED AFTERNOON. WINDS ALOFT AT 10KFT MSL: W
10-20 KT, BECOMING SW 25-40 KT AFTER WED/15Z.
KBOI...VFR TONIGHT. A MIX OF RAIN AND SNOW WILL ARRIVE AROUND
WED/15Z-16Z, CREATING MVFR/IFR CONDITIONS. BECOMING ALL RAIN
BY WED/18Z, CONTINUING THROUGH WED NIGHT. SURFACE WINDS: SE
5-15 KT, WED AFTERNOON GUSTS TO 20-25 KT.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...DENSE FOG HAS
MOSTLY MIXED OUT OF THE REGION THIS AFTERNOON AS A LOW PRESSURE
SYSTEM CONTINUES TO MOVE INTO THE REGION TONIGHT. PRECIPITATION
WILL START TONIGHT, WITH SNOW FALLING ACROSS MOST OF THE REGION
EARLY WEDNESDAY MORNING, THEN MIXING TO RAIN-SNOW MIX THROUGH
THE MID-MORNING. PATCHY FOG WILL THEN RE-FORM IN MOST LOWER
ELEVATION VALLEYS THIS EVENING AHEAD OF INCOMING PRECIPITATION.
TEMPERATURES WILL CONTINUE TO WARM THROUGH THE AFTERNOON, WITH
SNOW LEVELS RISING TO 3500-4500 FEET BY THE LATER AFTERNOON.
STEADY RAIN WILL FALL FOR VALLEYS BELOW ABOUT 4000 FEET THROUGH
THE EVENING, AS THE MAIN WARM FRONT PASSES THROUGH BY EARLY
AFTERNOON. RAIN AND SNOW SHOWERS, SOME CONVECTIVE IN NATURE,
WILL THEN FILTER INTO THE REGION WITH NORTHWEST WINDS AS A WEAK
COLD FRONT MOVES THROUGH BY WEDNESDAY EVENING. RAIN WILL
CONTINUE TO BE THE MAIN PRECIPITATION TYPE THROUGH THE EVENING
FOR THE SNAKE RIVER VALLEY, WITH MOUNTAINS SWITCHING BACK TO
SNOW BY WEDNESDAY NIGHT. SNOWFALL TOTALS BY THURSDAY MORNING OVER
HIGHER MOUNTAIN SUMMITS WILL RANGE FROM 8 TO 12 INCHES, WITH
MOUNTAIN VALLEYS SEEING ANYWHERE FROM 2 TO 4 INCHES OF SNOW.
MCCALL, ID HAS A FORECAST TOTAL OF 3 INCHES OF SNOW WITH ABOUT A
40% CHANCE OF EXCEEDING 4 INCHES BY THURSDAY MORNING. A FEW
SNOW SHOWERS WILL LINGER IN THE WEST CENTRAL-OWYHEE MOUNTAINS
INTO THURSDAY MORNING, BUT ACCUMULATIONS WILL BE MINIMAL.
TEMPERATURES WILL THEN CONTINUE A WARMING TREND BACK TO NEAR
NORMAL BY THURSDAY NIGHT.
LONG TERM...FRIDAY THROUGH TUESDAY...A BROAD UPPER RIDGE IS STILL
FAVORED BY ALL THE MODELS TO STRENGTHEN ACROSS THE WEST THROUGH THE
PERIOD, RESULTING IN A WARMING TREND FROM BELOW-NORMAL TEMPERATURES
FRI-SAT TO ABOVE NORMAL MON-TUE. HOWEVER, FAST-MOVING SHORT WAVE
UPPER TROUGHS ARE PROGGED TO MOVE THROUGH THE PACIFIC NORTHWEST FOR
PERIODS OF PRECIPITATION, MAINLY OVER THE WEEKEND. SNOW LEVELS ARE
EXPECTED TO REMAIN ABOVE VALLEY FLOORS FOR MOSTLY RAIN IN THE LOWER
ELEVATIONS AND RAIN/SNOW IN THE HIGHER ELEVATIONS. THE BULK OF THE
PRECIP IS SHOWN TO OCCUR ACROSS THE NORTH, WITH BURNS, BOISE, AND
JEROME ON THE SOUTHERN FRINGES OF THE PRECIP.
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
DISCUSSION...LC
AVIATION.....SH
SHORT TERM...SA
LONG TERM....BW
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page