592
FXUS65 KBOI 100805
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
201 AM MDT THU SEP 10 2026
KEY MESSAGES
- MOSTLY SUNNY AND WARMER TODAY.
- COLD FRONT AND GUSTY WINDS LATE TODAY AND THIS EVENING,
FOLLOWED BY BREEZY AND SLIGHTLY COOLER WEATHER FRIDAY,
THEN WARMER AGAIN SATURDAY.
- MUCH STRONGER COLD FRONT LATE SATURDAY AND SATURDAY NIGHT
WITH WIND GUSTS 40 TO 50 MPH IN SOUTHERN AREAS, AND
WIDESPREAD SHOWERS AND SCATTERED THUNDERSTORMS IN THE NORTH.
- WINDY AND MUCH COOLER SUNDAY, WITH SHOWERS CONTINUING IN THE
NORTH.
- WARMING AND DRYING MONDAY AND BEYOND.
SHORT TERM /THROUGH SATURDAY NIGHT/
LATEST SATELLITE IMAGERY SHOWS MID AND HIGH LEVEL CLOUDS IN NRN
CALIFORNIA AND OUT INTO THE PACIFIC. MODELS SPREAD THESE CLOUDS
ACROSS OUR SOUTHERN ZONES TODAY BUT LEAVE NORTHERN ZONES SUNNY.
A DRY COLD FRONT FROM THE NORTH WILL PUSH A BAND OF MID AND HIGH
CLOUDS ACROSS OUR NORTHERN ZONES TONIGHT, MERGING WITH THE SOUTHERN
CLOUDS IN EASTERN IDAHO LATE TONIGHT. TODAY WILL THEREFORE BE
"MOSTLY SUNNY". THE APPROACHING COLD FRONT WILL INCREASE WEST WINDS
TO 15-25 MPH IN SOUTHERN AREAS LATE TODAY AND THIS EVENING, BUT
AFTER IT PASSES FRIDAY WILL BE ONLY 5 TO 10 DEGREES COOLER THAN
TODAY MAINLY IN THE NORTH.
THE BIG STORY IS THE STRONGER COLD FRONT AND DEEP UPPER LOW STILL
FORECAST IN OUR CWA LATE SATURDAY THROUGH SUNDAY NIGHT. LATEST
MODELS DELAY ARRIVAL OF THE COLD FRONT UNTIL LATE SATURDAY AFTERNOON
IN EASTERN OR AND SATURDAY EVENING IN WESTERN ID. THIS DELAY WILL
ALLOW SATURDAY TO GET ABOUT 5 DEGREES WARMER THAN FORECAST YESTERDAY
MORNING. PRE-FRONTAL SOUTHWEST WINDS WILL STILL INCREASE IN
SOUTHEAST OR SATURDAY AFTERNOON, WITH FIRE DANGER ALSO INCREASING
DUE TO THE COMBINATION OF WIND AND LOW HUMIDITY. THE DEEP UPPER LOW
OFF THE OR COAST IS FORECAST INLAND ACROSS OR SATURDAY NIGHT, THEN
NORTHEASTWARD ACROSS NRN ID INTO MT SUNDAY, ALSO SLOWER THAN
FORECAST YESTERDAY. AS A RESULT, MAXIMUM FRONTAL WIND GUSTS SHOULD
BE SLIGHTLY LESS BUT STILL AT LEAST 40 MPH IN ALL SOUTHERN ZONES.
A WIND ADVISORY WILL BE CONSIDERED FOR THOSE AREAS IN THE DAY
FORECAST. THE REST OF THE PREVIOUS FORECAST IS STILL THERE:
WIDESPREAD SHOWERS AND SCATTERED THUNDERSTORMS WITH LOCALLY HEAVY
RAIN SATURDAY NIGHT IN NORTHERN AREAS, AND STRONG GUSTY WINDS IN
SOUTHWESTERN ID SATURDAY EVENING, AND SOUTH-CENTRAL ID LATER
SATURDAY NIGHT.
DUE TO THE SLOWER MOVEMENT OF THE UPPER LOW SHOWERS WILL CONTINUE
ALL DAY SUNDAY IN THE NORTH (WHERE THE MAIN MOISTURE WILL BE),
WITH GRADUAL CLEARING IN THE SOUTH. SUNDAY NIGHT WILL CONTINUE
THE CLEARING TREND FROM WEST TO EAST, AND WILL BE COLDER, WITH
AREAS OF FOG IN NORTHERN VALLEYS OVERNIGHT AND MONDAY MORNING.
THEN SUNNY AND WARMER MONDAY.
LONG TERM /SUNDAY THROUGH THURSDAY/
A FOLLOWING UPPER TROUGH WILL BRING ONLY SOME CLOUDS FROM THE
NORTH TO THE CENTRAL ID MOUNTAINS MONDAY NIGHT WHILE LEAVING OTHER
ZONES MOSTLY CLEAR. THE NEXT UPPER TROUGH WILL SPLIT A WEAK CLOSED
LOW OFF THE OR COAST WEDNESDAY, AGAIN LEAVING OUR CWA GENERALLY
CLEAR BUT ALSO WARMING INTO THURSDAY AND BEYOND.
AVIATION /06Z THURSDAY THROUGH FRIDAY/
ISSUED 1129 PM MDT WED SEP 9 2026
VFR WITH HIGH CLOUDS SOUTH AND CLEAR SKIES NORTH. COLD FRONT
AND BROKEN CLOUDS ABOVE 15KFT MSL WILL SPREAD SOUTHWARD INTO
CENTRAL ID (INCLUDING KMYL) AFTER 03Z FRIDAY. SURFACE WINDS:
VARIABLE LESS THAN 10 KT OVERNIGHT THROUGH THURSDAY MORNING,
BECOMING SW-NW 10-15 KT THURSDAY AFTERNOON. GUSTS TO 30 KT
AFTER 20Z THURSDAY IN THE MAGIC VALLEY AND SOUTH OF THE SNAKE
PLAIN. WINDS ALOFT AT 10KFT MSL: W 15-20 KT OVERNIGHT AND
THURSDAY MORNING, INCREASING TO 25-30 KT AFTER 18Z THURSDAY.
KBOI...VFR WITH CLEAR SKIES. SURFACE WINDS: SE 5-8 KT UNTIL 15Z
THURSDAY, BECOMING NW AROUND 10 KT BY 20Z.
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...LC
LONG TERM....LC
AVIATION.....TL
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