325
FXUS65 KBOI 111828
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1228 PM MDT SUN OCT 11 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- COOLER THAN NORMAL TEMPERATURES, 10 TO 15 DEGREES BELOW NORMAL
THROUGH MONDAY.
- UNSETTLED CONDITIONS THROUGH EARLY TUESDAY, MAINLY ON THE
IDAHO SIDE, WITH WIDESPREAD RAINFALL 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.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 320 AM MDT SUN OCT 11 2026
THE CLOSED UPPER LOW WILL SLOWLY DIG SOUTHWARD RIGHT INTO OUR AREA
TODAY THROUGH MONDAY, WITH THE CENTER HANGING OVER EAST-CENTRAL OR.
THIS PATTERN WILL CONTINUE TEMPERATURES 10 TO 15 DEGREES BELOW
NORMAL TODAY AND MONDAY. THE SYSTEM WILL STEER ABUNDANT TROPICAL
MOISTURE OVER EAST/CENTRAL ID THROUGH LATE MONDAY, CONTINUING THE
ONSET OF WIDESPREAD PRECIPITATION ALONG THE EASTERN PORTIONS OF OUR
CWA. THE MAGIC VALLEY AND BOISE MOUNTAINS WILL STILL SEE THE HIGHEST
POTENTIAL FOR HEAVY RAINFALL TODAY THROUGH MONDAY, WITH TOTAL
AMOUNTS OF 0.5 TO 1.0 POSSIBLE GENERALLY FROM TWIN FALLS AND AREAS
FURTHER EAST, WITH UP TO 0.25 POSSIBLE OVER THE REST OF SW IDAHO.
SOUTHEAST OR WILL BE VERY LIMITED IN PRECIPITATION, BUT WILL SEE
SOME BREEZY NORTHWEST WINDS THIS AFTERNOON FROM THE LOW PASSAGE.
WITH SNOW LEVELS EXPECTED TO DROP IN A WEST-TO-EAST GRADIENT AT 4000-
6000 FT MSL IN EASTERN OR TO 6000-8000 FT MSL IN SOUTHWEST ID,
MOUNTAIN SNOW/WINTRY MIX SHOWERS ARE EXPECTED IN THE CENTRAL ID
MOUNTAINS THROUGH MONDAY, BUT WITH LIGHT ACCUMULATIONS LIMITED TO
HIGH PEAKS. BY LATE MONDAY, THE UPPER LOW WILL DIG FURTHER DOWN INTO
THE UPPER GREAT BASIN AS IT STEERS OUT EAST, BUT WITH A WEAKENING
MOISTURE LOAD. PRECIPITATION CHANCES OVER THE MAGIC VALLEY AND BOISE
MOUNTAINS WILL GRADUALLY DIMINISH LATE MONDAY AND EARLY TUESDAY, BUT
THE EXTENT OF THE LOW'S REMAINING MOISTURE CONTINUING RAINFALL OVER
SOUTH-CENTRAL ID REMAINS SLIGHTLY UNCERTAIN. TUESDAY WILL SEE THE
LOW MOVE COMPLETELY OUT OF OUR AREA AS A SHARP PACIFIC RIDGE BUILDS
IN, RETURNING DRIER CONDITIONS AND NEAR-NORMAL TEMPERATURES.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 320 AM MDT SUN OCT 11 2026
A WARMING AND DRYING TREND WILL SET IN WEDNESDAY THROUGH THE
END OF THE WEEK AS A STRONG PACIFIC RIDGE BUILDS IN BEHIND THE
UPPER LOW PUSHING OUT EAST. THIS RIDGING WILL BRING MOSTLY CLEAR
SKIES THROUGHOUT THE WEEK, WITH SOME OVERNIGHT/MORNING FOG
POSSIBLE IN MOUNTAIN VALLEYS EACH DAY. TEMPERATURES WILL TAKE ON
A SLOW WARMING TREND WEDNESDAY THROUGH SUNDAY. TEMPERATURES 5
TO 10 DEGREES ABOVE NORMAL REMAIN POSSIBLE FRIDAY THROUGH SUNDAY
AS THE AREA COMES UNDER PEAK RIDGING FROM THE PACIFIC HIGH.
AVIATION /18Z SUNDAY THROUGH MONDAY/
ISSUED 1228 PM MDT SUN OCT 11 2026
GENERALLY VFR. BROAD AREA OF PRECIP EXPANDING FROM SE-NW THROUGH
THE DAY IN SW-IDAHO, MAINLY EAST OF A KMYL/KBOI LINE. LOW-VFR
TO MVFR POSSIBLE IN RAIN, MVFR-LIFR IN MTN SNOW. MTNS OBSCURED
IN PRECIP. SNOW LEVELS IN SW-IDAHO: 6-8.5 KFT MSL SUN/PM, THEN
5-7 KFT MSL MON/AM. SURFACE WINDS: W-NW 5-15 KT WITH GUSTS TO
20-30 KT THIS AFTERNOON/EVENING. GUSTS DECREASING OVERNIGHT.
WINDS ALOFT AT 10KFT MSL: VARIABLE 5-15 KT.
KBOI...VFR. A 30% CHANCE OF LIGHT RAIN BETWEEN SUN/23Z-MON/05Z.
SURFACE WINDS: NW THROUGH THE PERIOD, 10-15 KT WITH GUSTS TO
AROUND 20 KT THIS AFTERNOON, DECREASING TO 5-10 KT OVERNIGHT.
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.....NF
SHORT TERM...JY
LONG TERM....JY
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