128
FXUS65 KBOI 251152
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
552 AM MDT FRI SEP 25 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- A STRONG COLD FRONT WILL BRING GUSTY WINDS AND COOLER
TEMPERATURES AREA-WIDE TODAY, WITH ISOLATED SHOWERS FOR THE
NORTH.
- TEMPERATURES WILL AVERAGE 10 DEGREES BELOW NORMAL ON SATURDAY.
- A WEAK LOW PRESSURE SYSTEM WILL SUPPORT SHOWER CHANCES NEAR
THE NV BORDER AND CENTRAL IDAHO SUNDAY.
- SEASONABLE TEMPERATURES RETURNING NEXT WEEK.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 303 AM MDT FRI SEP 25 2026
A PRONOUNCED LOW PRESSURE SYSTEM IS CURRENTLY MOVING THROUGH
WESTERN WASHINGTON AND OREGON EARLY THIS MORNING AND WILL
CONTINUE INTO EASTERN OREGON AND IDAHO LATER TODAY. THE
ACCOMPANYING COLD FRONT WILL ARRIVE IN EAST OREGON BY MID
MORNING, AND INTO SOUTHWEST AND CENTRAL IDAHO BY THIS AFTERNOON
AND EVENING. RAIN SHOWERS WILL MOVE ALONG THE FRONT, REMAINING
LIMITED TO NORTHEAST OR AND W-CENTRAL ID. HOWEVER, CHANCES FOR
MEASURABLE RAINFALL ARE RELATIVELY LOW (10-25%). WINDS WILL
TRANSITION FROM SOUTHEAST-SOUTHWEST TO WEST-NORTHWEST WITH THE
FRONTAL PASSAGE, WITH GUSTS INCREASING TO 25-35 MPH ACROSS THE AREA.
POCKETS OF 40 MPH CAN BE EXPECTED IN PORTIONS OF THE UPPER TREASURE
VALLEY AND THE HIGHER TERRAIN OF SOUTHWEST/CENTRAL IDAHO. MAX
TEMPERATURES WILL COOL AS MUCH AS 15-20 DEGREES IN THE OREGON ZONES
TODAY COMPARED TO YESTERDAY. DUE TO THE LATER ARRIVAL OF THE FRONT,
THE IDAHO ZONES WILL HAVE 5-15 DEGREES OF COOLING TODAY, THEN
ADDITIONAL 5-15 DEGREES OF COOLING FOR SATURDAY. WINDS WILL
GRADUALLY TAPER OFF TONIGHT AS THE TROUGH EXITS TOWARD THE
NORTHEAST, WITH DRIER, COOL, AND MOSTLY CLOUDY WEATHER PREVAILING ON
SATURDAY. A WEAK, ELONGATED TROUGH WILL THEN APPROACH ON SUNDAY AND
GENERATE A SLIGHT CHANCE OF SHOWERS NEAR THE NEVADA BORDER AND OVER
CENTRAL IDAHO THROUGH SUNDAY NIGHT.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 303 AM MDT FRI SEP 25 2026
THE AFOREMENTIONED TROUGH WILL EXIT MONDAY, ALLOWING TEMPERATURES
TO REBOUND TO NEAR-NORMAL VALUES THROUGH MUCH OF THE WEEK AS
WESTERLY FLOW DEVELOPS ALOFT. BENIGN CONDITIONS WILL PROCEED
THROUGH AT LEAST THURSDAY AS THE STORM TRACK REMAINS NORTH OF
THE AREA. LONG RANGE ENSEMBLE MEMBERS ARE SIGNALING ANOTHER
COOL-DOWN TOWARD THE END OF THE WEEK AS 1000-500MB THICKNESSES
GRADUALLY LOWER. HOWEVER, GUIDANCE CONTINUES TO KEEP MOISTURE
OUT OF THE FORECAST AREA THROUGH THE EXTENDED PERIOD.
AVIATION /12Z FRIDAY THROUGH SATURDAY/
ISSUED 550 AM MDT FRI SEP 25 2026
VFR. COLD FRONT WILL MOVE FROM W TO E TODAY, BRINGING GUSTY
WINDS AREA-WIDE. ISOLATED SHOWERS AND LOWER CEILINGS WILL PASS
THROUGH NORTHEAST OR AND W-CENTRAL ID LATE MORNING THROUGH
EVENING, WITH LIGHT RAIN OR VIRGA FOR KBNO/KBKE/KMYL. SURFACE
WINDS: S-SE 5-15 KT WITH 15-25 KT GUSTS. SHIFTING TO SW-NW 10-20
KT WITH 20-35 KT GUSTS WITH FRONT. WINDS ALOFT AT 10KFT MSL: SW
20-40 KT, GRADUALLY DECREASING BY THIS EVENING. POCKETS OF LLWS
THROUGH MID MORNING.
KBOI...VFR. SURFACE WINDS: S-SE 7-14 KT WITH OCCASIONAL GUSTS
NEAR 20 KT THROUGH MORNING. COLD FRONT WILL MOVE THROUGH EARLY
AFTERNOON, SHIFTING WINDS TO NW 12-20 KT WITH 25-30 KT GUSTS.
WEEKEND OUTLOOK...VFR WITH HIGH/MID LEVEL CEILINGS SATURDAY AND
SUNDAY. ISOLATED SHOWERS NEAR NV BORDER AND OVER CENTRAL ID
MTNS SUNDAY. SURFACE WINDS: NW 5-15 KT SATURDAY, AND NW 5-20 KT
SUNDAY.
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
SHORT TERM...SH
LONG TERM....SH
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