263
FXUS65 KBOI 190957
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
257 AM MST WED FEB 19 2025
SHORT TERM...TODAY THROUGH FRIDAY NIGHT
THE NEXT IN A SERIES OF WINTER STORM SYSTEMS IS ON TRACK TO
AFFECT THE REGION THROUGH THURSDAY, BRINGING WIDESPREAD SNOW AND
RAIN. MORNING RADAR AND SATELLITE IMAGERY SHOWS A SWATH OF
PRECIPITATION SPREADING EASTWARD ACROSS CENTRAL OREGON. SURFACE
OBSERVATIONS SUGGEST COLD AIR IS EMBANKED FROM ONTARIO UP
THROUGH BAKER - COLDER THAN MOST MODEL GUIDANCE IS INDICATING -
WHICH WILL LIKELY FAVOR SLIGHTLY LONGER DURATION OF SNOW THAN IN
OTHER AREAS. OVERALL SNOW ACCUMULATIONS ARE EXPECTED TO BE
LIGHT BELOW ABOUT 5000 FEET, AS WARMER AIR ADVECTS NORTHWARD
THROUGHOUT THE DAY. HOWEVER AN INITIAL PERIOD OF SNOW IS LIKELY
AT MANY LOWER ELEVATION LOCATIONS, INCLUDING THE TREASURE
VALLEY, WHERE THERE'S ABOUT A 10% CHANCE OF SNOW ACCUMULATIONS
EXCEEDING AN INCH AROUND THE BOISE AREA, AND A 50% CHANCE OF
EXCEEDING AN INCH FROM ONTARIO NORTHWARD. A RAIN/SNOW MIX (AND
EVENTUALLY FAVORING RAIN) IS EXPECTED BY AFTERNOON AS SNOW
LEVELS CLIMB TO 4000-5000 FEET. MOUNTAIN SNOW TOTALS MAY STILL
BE QUITE HIGH IN SOME LOCATIONS, REACHING 8-12 INCHES IN PARTS
OF THE BOISE AND WEST-CENTRAL MOUNTAINS. BY LATE THURSDAY
MORNING, DRIER AIR QUICKLY MOVES INTO THE REGION AS UPPER
RIDGING REBUILDS. A WARMING TREND BEGINS FRIDAY WHICH WILL
PERSIST INTO NEXT WEEK.
LONG TERM...SATURDAY THROUGH WEDNESDAY
A SERIES OF CONTINUOUS SHORTWAVE TROUGHS WILL MOVE INTO THE AREA
FROM THE PACIFIC NW COAST OVER THE WEEKEND. ANOTHER ROUND OF
PRECIPITATION WILL BE EXPECTED PRIMARILY ON SUNDAY. HIGHER DAYTIME
TEMPERATURES AND SNOW LEVELS OF 6000-7000 FT WILL GENERALLY FAVOR
RAIN ACROSS THE LOWER VALLEYS AND LIGHT SNOWFALL OVER THE MOUNTAINS
THROUGH MONDAY. WARMER AFTERNOON TEMPERATURES REACHING INTO THE
LOWER 50S ARE ALSO EXPECTED SUNDAY INTO EARLY NEXT WEEK. ANOTHER
WEAK STORM SYSTEM IS PROJECTED TO MOVE INTO THE REGION OFF THE NW
COAST THROUGH TUESDAY, WITH CONTINUED CHANCES OF PRECIPITATION INTO
THE MIDDLE OF THE WEEK.
AVIATION
INTERMITTENT FOG AND/OR LOW CEILINGS AFFECTING
KONO/KEUL/KBKE/KMYL AND SURROUNDING AREAS. WIDESPREAD RAIN/SNOW
MOVES ACROSS EASTERN OREGON INTO 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
NEAR KBNO THIS MORNING. RAIN/SNOW DECREASES IN COVERAGE
THURSDAY MORNING. SURFACE WINDS: E TO S 5-15 KT, BECOMING SE TO
S TO W 10-20 KT WITH GUSTS TO 20-30 KT WED AFTERNOON. WINDS
ALOFT AT 10KFT MSL: SW 25-35 KT, BECOMING NW 20-30 KT AFTER
THU/00Z.
KBOI...VFR BEFORE A MIX OF RAIN AND SNOW ARRIVES AROUND
WED/15Z-16Z, CREATING MVFR/IFR CONDITIONS. BECOMING ALL RAIN BY
WED/18Z, CONTINUING THROUGH WED NIGHT. SCATTERED RAIN SHOWERS
EARLY THURSDAY MORNING, ENDING AROUND THU/12Z. SURFACE WINDS:
SE 5-15 KT, WED AFTERNOON GUSTS TO 20-25 KT.
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...JR
LONG TERM....JY/JR
AVIATION.....JR
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