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FXUS65 KBOI 171147
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
547 AM MDT FRI APR 17 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- WIDESPREAD SUBFREEZING TEMPERATURES AGAIN TONIGHT.
- DRIER AND WARMER DAYS THROUGH MONDAY AND STAYING WARM THROUGH
TUESDAY.
- NEXT CHANCE OF PRECIPITATION LATE TUESDAY FROM AN INCOMING
PACIFIC LOW.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 259 AM MDT FRI APR 17 2026
COLD, DRY AIR CURRENTLY OVER OUR CWA WITH CLEAR SKIES AND LIGHT
WINDS UNDER NORTHERLY FLOW ALOFT. AT 2 AM MDT ALL AREAS WERE
BELOW 32 DEGREES WITH BURNS AND ROME/OR THE COLDEST AT 22
DEGREES. THE FREEZE WARNING FOR THE TREASURE AND MAGIC VALLEY
AGRICULTURAL AREAS HAS VERIFIED, AND TEMPS ARE EXPECTED TO STAY
BELOW FREEZING UNTIL 10 AM MDT. HOWEVER, DAYTIME HIGHS WILL RISE
RAPIDLY (ABOUT 10 DEGREES PER DAY) TODAY THROUGH MONDAY, AS A
PACIFIC UPPER RIDGE MOVES ONSHORE. NIGHTS WILL WARM MORE SLOWLY,
AND ANOTHER FREEZE IS FORECAST FOR THE AG VALLEYS TONIGHT, BUT
NOT QUITE AS COLD AS THE CURRENT NIGHT. THE NEXT PACIFIC UPPER
LOW IS NOW FORECAST TO STAY OFFSHORE UNTIL TUESDAY NIGHT SO
WARM, DRY WEATHER SHOULD CONTINUE THROUGH AT LEAST LATE
TUESDAY, WHEREAS YESTERDAY'S MODELS HAD TUESDAY ALREADY WET.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 259 AM MDT FRI APR 17 2026
A CLOSED LOW WILL RESIDE ALONG THE WEST COAST EARLY NEXT WEEK,
PULLING WARM SOUTHERLY AIR INTO SE OREGON AND SW IDAHO. THIS WILL
DRIVE MONDAY'S TEMPERATURES TO 10-15 DEGREES ABOVE SEASONAL NORMALS,
PEAKING AT UPPER 70S/LOW 80S FOR THE LOW ELEVATIONS. WHILE THESE
MILD CONDITIONS PERSIST INTO TUESDAY, PRECIPITATION WILL BEGIN TO
INCREASE ACROSS E OREGON LATE TUE AS THE CENTER OF THE LOW SHIFTS
INLAND. BY WEDNESDAY AND THURSDAY, THE LOW IS FORECAST TO MOVE
OVERHEAD, GENERATING BREEZY SURFACE WINDS AND EXPANDING THE SHOWER
ACTIVITY INTO SW IDAHO. HIGH MOUNTAIN SNOW WILL ACCUMULATE AS SNOW
LEVELS LOWER TO 5000-7000 FT MSL. FORECAST MODELS DIVERGE LATE IN
THE WEEK REGARDING THE TRACK OF THE LOW, BUT CURRENT ENSEMBLE
GUIDANCE SUGGESTS TWO-DAY LIQUID PRECIP TOTALS OF 0.10" TO 0.40"
FOR VALLEYS, AND 0.50" TO 1.00" IN THE MOUNTAINS THROUGH THURSDAY
NIGHT. TEMPERATURES WILL LOWER TO NEAR-SEASONABLE VALUES FOR
WED-FRI.
AVIATION /12Z FRIDAY THROUGH SATURDAY/
ISSUED 547 AM MDT FRI APR 17 2026
LOCAL MTN VALLEY FOG THIS AM. ISOLATED SNOW SHOWERS OVER WEST-
CENTRAL ID MTNS PRODUCING LOCALIZED MVFR/IFR CONDITIONS THIS
MORNING AND AFTERNOON. OTHERWISE, VFR WITH SCATTERED CUMULUS
OVER MTNS. SURFACE WINDS: VARIABLE LESS THAN 10 KT, EXCEPT SW-
NW 10-20 KT IN THE MAGIC VALLEY. WINDS ALOFT AT 10KFT MSL: NW
10-20 KT.
KBOI...VFR AND MOSTLY CLEAR. SURFACE WINDS: SOUTHEAST OR
VARIABLE AROUND 5 KT, BECOMING NW 5-10 KT AFTER FRI/16Z.
WEEKEND OUTLOOK...VFR. DRY WITH PERIODS OF MID-HIGH CLOUD COVER.
LOCAL MTN VALLEY FOG SATURDAY MORNING. SURFACE WINDS S-SE 5-15 KT
SATURDAY INCREASING TO 10-20 KT WITH GUSTS 20-30 KT ON SUNDAY.
STRONGEST WINDS ON SUNDAY IN THE SNAKE PLAIN EAST OF KBOI.
VARIABLE UP TO 15 KT OVERNIGHT SAT/SUN NIGHT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...FREEZE WARNING UNTIL 10 AM MDT THIS MORNING FOR IDZ012-014-016.
FREEZE WARNING FROM MIDNIGHT TONIGHT TO 10 AM MDT SATURDAY FOR
IDZ012-014-016.
OR...FREEZE WARNING UNTIL 10 AM MDT /9 AM PDT/ THIS MORNING FOR
ORZ064.
FREEZE WARNING FROM MIDNIGHT MDT /11 PM PDT/ TONIGHT TO 10 AM
MDT /9 AM PDT/ SATURDAY FOR ORZ064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SH
SHORT TERM...LC
LONG TERM....SH
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