217
FXUS65 KBOI 131801
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1201 PM MDT TUE OCT 13 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- UNSETTLED CONDITIONS THROUGH THE AFTERNOON TODAY, WITH SHOWERS
MAINLY OVER THE LOWER MAGIC VALLEY.
- COLD MORNING TEMPERATURES THIS MORNING AND WEDNESDAY MORNING
WILL BRING PATCHY FROST AND NEAR-FREEZING CONDITIONS, WITH
FROST ADVISORIES IN EFFECT FOR THE SNAKE PLAIN VALLEY AREAS.
- WARM AND DRY CONDITIONS WEDNESDAY THROUGH THE WEEKEND.
TEMPERATURES REACHING UP TO 10 DEGREES ABOVE NORMAL BY
FRIDAY.
SHORT TERM /THROUGH THURSDAY NIGHT/
ISSUED 309 AM MDT TUE OCT 13 2026
THE CLOSED UPPER LOW HAS MOVED SOUTH OF US INTO THE GREAT
BASIN, AND WILL SHIFT EASTWARD OUT OF THE REGION TODAY
(TUESDAY). THE LOW'S REMAINING MOISTURE LOAD WILL CONTINUE SOME
PRECIPITATION OVER THE LOWER MAGIC VALLEY NEAR THE NV BORDER
THIS MORNING THROUGH THE AFTERNOON, BEFORE COMPLETELY TAPERING
OFF BY THE EVENING. SNOW LEVELS IN THE 4500-6000 FT MSL RANGE
OVER SOUTH-CENTRAL ID WILL CONTINUE SOME LIGHT SNOW SHOWERS OVER
HIGH TERRAIN AREAS OF THE SOUTHERN HIGHLANDS AND THE OWYHEES.
LOW NIGHTTIME TEMPERATURES NEAR FREEZING, COUPLED WITH SOME HIGH
SURFACE MOISTURE, WILL BRING DENSE FROST COVERAGES OVER MOST
AREAS THIS MORNING AND WEDNESDAY MORNING. AS SUCH, A FROST
ADVISORY REMAINS IN PLACE OVER THE SNAKE PLAIN THROUGH WEDNESDAY
LATE MORNING. OTHERWISE, A PACIFIC RIDGE OF HIGH PRESSURE WILL
QUICKLY BUILD IN BY TONIGHT, BRINGING DAYTIME TEMPERATURES UP TO
NEAR AND ABOVE NORMAL WITH DRY CONDITIONS AREAWIDE THROUGH
THURSDAY. WEDNESDAY WILL SEE TEMPERATURES HOVERING SLIGHTLY
ABOVE NORMAL, MAINLY OVER THE LOWER TREASURE VALLEY AREAS.
THURSDAY WILL SEE PEAK TEMPERATURES 5 TO 10 DEGREES ABOVE NORMAL
AS THE PACIFIC HIGH FURTHER AMPLIFIES OVER THE NORTHWEST
REGION.
LONG TERM /FRIDAY THROUGH TUESDAY/
ISSUED 309 AM MDT TUE OCT 13 2026
FRIDAY THROUGH SATURDAY WILL CONTINUE TO SEE DRY CONDITIONS AND
TEMPERATURES 5 TO 10 DEGREES ABOVE NORMAL AS THE LARGE PACIFIC
HIGH CONTINUES TO BUILD IN AND AMPLIFY OVER THE REGION. CLEAR
SKIES AND GOOD RADIATIONAL COOLING OVERNIGHT WILL ALLOW FOR
MOUNTAIN VALLEY FOG DEVELOPMENT THROUGH THE MORNINGS. ON SUNDAY,
A WEAK SHORTWAVE TROUGH WILL PASS OVER THE NORTHWEST AND BRING
A DRY COLD FRONT ACROSS OUR AREA. THIS FRONTAL PASSAGE MAY BRING
A SLIGHT COOLDOWN SUNDAY THROUGH MONDAY. FOR NOW, TEMPERATURES
ARE STILL LOOKING TO BE 5 TO 10 DEGREES ABOVE NORMAL ON THOSE
DAYS. ENSEMBLE GUIDANCE REMAINS IN STRONG AGREEMENT ON ANOTHER
CLOSED UPPER LOW DIGGING INTO THE REGION FROM THE GULF OF ALASKA
LATE MONDAY THROUGH MIDWEEK. ALTHOUGH SLIGHT UNCERTAINTY
REMAINS OVER THE INTENSITY AND COVERAGE, MOST AREAS SHOULD SEE
SOME MODERATE CHANCES OF PRECIPITATION LATE MONDAY THROUGH
TUESDAY.
AVIATION /18Z TUESDAY THROUGH WEDNESDAY/
ISSUED 1201 PM MDT TUE OCT 13 2026
VFR. LOW CLOUDS CONTINUING NEAR KTWF/KJER EARLY THIS AFTERNOON,
CLEARING OUT TO BE MOSTLY SUNNY AREA-WIDE BY LATE AFTERNOON.
SURFACE WINDS: W-NW 5-15 KT WITH GUSTS TO 20-25 KT THIS
AFTERNOON, THEN VARIABLE 5-10 KT OVERNIGHT. WINDS ALOFT AT
10KFT MSL: N 10-25 KT.
KBOI...VFR UNDER CLEAR SKIES. SURFACE WINDS: NW 10-15 KT WITH
GUSTS TO AROUND 22 KT THIS AFTERNOON. BECOMING VARIABLE UNDER 8
KT OVERNIGHT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...FROST ADVISORY UNTIL 10 AM MDT WEDNESDAY FOR IDZ012-014.
FREEZE WARNING UNTIL 10 AM MDT WEDNESDAY FOR IDZ016.
OR...FROST ADVISORY UNTIL 10 AM MDT /9 AM PDT/ WEDNESDAY FOR ORZ064.
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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