936
FXUS65 KBOI 201815
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1215 PM MDT SAT JUN 20 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- SCATTERED SHOWERS TODAY WITH SCATTERED THUNDERSTORMS
DEVELOPING THIS AFTERNOON.
- DAYTIME TEMPERATURES COOLING TO 5 DEGREES ABOVE NORMAL THROUGH
SUNDAY, THEN HOTTER AND DRIER MONDAY THROUGH WEDNESDAY WITH
TEMPERATURES AROUND 10 TO 15 DEGREES ABOVE NORMAL.
SHORT TERM /THROUGH MONDAY NIGHT/
ISSUED 401 AM MDT SAT JUN 20 2026
A WEAK SYSTEM IS MOVING NORTHEASTWARD OVER THE GREAT BASIN INTO
SOUTHWEST MT THIS AFTERNOON. SCATTERED SHOWERS MOVING OVER THE
AREA TODAY WITH LIGHT RAIN SHOWERS THIS MORNING. AS THE SYSTEM
MOVES NORTHEAST, PARTIAL CLEARING WILL LEAD TO DESTABILIZATION
THIS AFTERNOON, WITH SCATTERED THUNDERSTORMS DEVELOPING DURING
THE AFTERNOON. BREEZY WEST-NORTHWEST WINDS THIS AFTERNOON,
STRONGEST IN THE MAGIC VALLEY. DRIER AIR MOVES INTO THE AREA ON
SUNDAY WITH AFTERNOON WEST-NORTHWEST BREEZES. A RIDGE
STRENGTHENS OVER THE AREA ON MONDAY WITH WARMER TEMPERATURES.
TEMPERATURES WILL BE AROUND 5 DEGREES ABOVE NORMAL THROUGH
SUNDAY BEFORE A SLIGHT WARMING TREND MONDAY.
LONG TERM /TUESDAY THROUGH SATURDAY/
ISSUED 401 AM MDT SAT JUN 20 2026
A RIDGE WILL STRENGTHEN AND REMAIN OVER THE AREA THROUGH AT
LEAST WEDNESDAY. TEMPERATURES WILL BE 10 TO 15 DEGREES ABOVE
NORMAL WITH VALUES 95-100F IN THE LOWEST VALLEYS TUESDAY AND
WEDNESDAY. NEAR RECORD HIGHS POSSIBLE ON WEDNESDAY AFTERNOON,
WITH BOI FORECAST OF 98F TYING THE RECORD OF 98F SET IN 1992.
MODELS INDICATE AN UPPER LEVEL TROUGH MOVING INTO THE PACIFIC
NORTHWEST SOMETIME BETWEEN THURSDAY AND SATURDAY. THIS SYSTEM
WILL BRING MUCH COOLER TEMPERATURES AND UNSETTLED CONDITIONS BY
FRIDAY AND SATURDAY.
AVIATION /18Z SATURDAY THROUGH SUNDAY/
ISSUED 1117 AM MDT SAT JUN 20 2026
VFR. RAIN SHOWERS IN THE CENTRAL ID MOUNTAINS TODAY, WITH
SCATTERED THUNDERSTORMS DEVELOPING OVER THE NV BORDER AND NEAR
KTWF THIS EVENING. OUTFLOW WINDS UP TO 40 KT, BRIEF HEAVY RAIN,
AND LIGHTNING ARE THE MAIN HAZARDS. MOUNTAIN OBSCURATION IN
MOUNTAIN SHOWERS. CLEARING SKIES OVERNIGHT. SURFACE WINDS:
W-NW 5-15 KT WITH GUSTS TO 25 KT. WINDS ALOFT AT 10KFT: W-NW
10-20 KT.
KBOI...VFR. MOUNTAINS OBSCURED NE OF TERMINAL IN PRECIPITATION.
SHOWERS ENDING IN THE EARLY AFTERNOON. SURFACE WINDS: NW 5-15KT
THEN VARIABLE LESS THAN 10 KT .
SUNDAY OUTLOOK...VFR AND CLEARING SKIES SUNDAY MORNING, WITH
BREEZY W-NW WINDS SUNDAY AFTERNOON.
BOI WATCHES/WARNINGS/ADVISORIES
ID...RED FLAG WARNING UNTIL 6 PM MDT THIS EVENING FOR IDZ423-426.
OR...RED FLAG WARNING UNTIL 5 PM PDT THIS AFTERNOON FOR ORZ670-672.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SA
SHORT TERM...KA
LONG TERM....KA
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