939
FXUS65 KBOI 120541
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1141 PM MDT SUN OCT 11 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- FROST POSSIBLE IN THE SNAKE PLAIN THROUGH TUESDAY NIGHT WITH
TEMPERATURES 5 TO 15 DEGREES BELOW NORMAL.
- UNSETTLED CONDITIONS THROUGH EARLY TUESDAY, MAINLY ON THE
IDAHO SIDE, WITH SHOWERS MAINLY OVER MAGIC VALLEY AND BOISE
MOUNTAINS.
- SNOW LEVELS NEAR 6000-7000 FEET IN THE WEST CENTRAL ID
MOUNTAINS THROUGH MONDAY WITH LIGHT ACCUMULATIONS.
- WARM AND DRY CONDITIONS WEDNESDAY THROUGH NEXT WEEKEND.
DISCUSSION
ISSUED 835 PM MDT SUN OCT 11 2026
INTO S-CENTRAL IDAHO THIS EVENING. IT HAS DROPPED UP TO 0.10" IN
THE TREASURE VALLEY (BOISE AREA) TO NEARLY 0.25" IN THE
FOOTHILLS AND BOISE MTNS. FORECAST MODELS HAVE BEEN TOO QUICK TO
DISSIPATE THE THIS FEATURE AS IT MOVES EAST AND GIVEN CONTINUED
COOLING IN IR SATELLITE IMAGERY, WOULD EXPECT IT TO HOLD
TOGETHER FOR THE NEXT COUPLE OF HOURS. LOW TEMPERATURES TONIGHT
ACROSS AG AREAS ARE ANOTHER CONCERN. GIVEN CURRENT AND FORECAST
CLOUD COVER AND WINDS EXPECT TEMPERATURES TO STAY ABOVE
FREEZING IN LOWER SNAKE PLAIN TONIGHT WITH LOWS RANGING BETWEEN
34 AND 38 DEGREES. MADE AN EARLIER UPDATE TO THE FORECAST TO
CAPTURE THIS CHANGE AND ADD FROST TO SITES IN THE LOWER/UPPER
TREASURE VALLEY. THE BEST CHANCE FOR FROST TO DEVELOP WILL BE
NORTH OF I-84 WEST OF BOISE. THIS AREA, TO INCLUDE STAR, EMMETT
AND FRUITLAND WILL SEE LIGHTER WINDS TOWARDS SUNRISE. KEPT FROST
WORDING OUT OF THE WESTERN MAGIC VALLEY AS SUB 36 DEGREE TEMPS
WOULD BE BRIEF AND COULD BE ACCOMPANIED BY LIGHT RAIN OR
RAIN/SNOW EARLY MONDAY MORNING. WINDS WILL ALSO REMAIN BREEZY
THROUGH THE NIGHT.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 246 PM MDT SUN OCT 11 2026
AN UPPER LEVEL TROUGH OVER EASTERN OR WILL KEEP CONDITIONS COOL
AND UNSETTLED THROUGH MONDAY. SHOWERS WILL MAINLY BE CONFINED TO
SOUTHWEST IDAHO WITH THE HIGHEST CHANCES OF PRECIPITATION
OVER THE HIGHER TERRAIN AND MAGIC VALLEY. EASTERN OR WILL
GENERALLY REMAIN DRY, WITH A SLIGHT CHANCE OF SHOWERS IN FAR SE
OREGON. SIMILAR CONDITIONS ON MONDAY AS THE TROUGH REMAINS
NEARLY STATIONARY. MONDAY WILL BE THE COOLEST DAY OF THE PERIOD.
BY TUESDAY THE TROUGH WILL MOVE INTO SOUTHERN NV AND UT WITH A
CHANCE OF SHOWERS MAINLY ALONG THE NV BORDER AND MAGIC VALLEY
THROUGH TUESDAY. TEMPERATURES WILL WARM AROUND 10 DEGREES AS THE
UPPER LEVEL TROUGH MOVES SE.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 246 PM MDT SUN OCT 11 2026
A WARMING AND DRYING TREND WILL PERSIST WEDNESDAY THROUGH THE
END OF THE PERIOD. AS THE LOW THAT BROUGHT ALL THE WEATHER IN
THE SHORT-TERM DEPARTS TO OUR EAST, A PACIFIC RIDGE WILL BUILD
IN, SHIFTING EAST TO BE OVER THE GREAT BASIN BY THE WEEKEND. AS
A RESULT, TEMPERATURES WILL WARM TO BE 5-10 DEGREES NORMAL COME
THE WEEKEND.
AVIATION /06Z MONDAY THROUGH TUESDAY/
ISSUED 1140 PM MDT SUN OCT 11 2026
GENERALLY VFR. WRAP-AROUND MOISTURE WILL BRING LIGHT RAIN/MTN SNOW
OVERNIGHT THROUGH MON NIGHT, MAINLY IN S-CENTRAL/CENTRAL IDAHO AND
NE OREGON. LOW-VFR/MVFR IN LOW STRATUS OR RAIN, IFR-LIFR IN MTN
SNOW. MOUNTAINS OBSCURED IN STRATUS/PRECIP. SNOW LEVELS: 5-7KFT MSL
FOR SW IDAHO, 3.5-5KFT MSL IN E OREGON. SURFACE WINDS: SW-NW 5-15
KT, WITH GUSTS 20-25 KT FROM KBKE-KONO, DECREASING TO 5-10 KT
OVERNIGHT. WINDS ALOFT AT 10KFT MSL: VARIABLE 5-15 KT, THEN NW 5-15
KT MON AFTERNOON.
KBOI...VFR AND SCT/BKN LOW CLOUDS. SURFACE WINDS: BECOMING NW 4-12
KT OVERNIGHT THROUGH MONDAY.
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
AVIATION.....SH
DISCUSSION...DG
SHORT TERM...KA
LONG TERM....NF
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