849
FXUS65 KBOI 232003
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
203 PM MDT SAT MAY 23 2026
KEY MESSAGES
- MOSTLY DRY WITH TEMPERATURES 10 TO 15 DEGREES ABOVE NORMAL
THROUGH MEMORIAL DAY.
- GUSTY WINDS MONDAY AHEAD OF A PACIFIC COLD FRONT, RESULTING
IN ELEVATED FIRE WEATHER CONDITIONS IN EASTERN OREGON.
- MUCH COOLER WITH GUSTY WINDS AND A CHANCE OF SHOWERS AND
THUNDERSTORMS TUESDAY THROUGH THURSDAY.
SHORT TERM /THROUGH MONDAY NIGHT/
HIGH PRESSURE REMAINS IN CONTROL THROUGH MONDAY WITH INCREASING
SOUTHWEST FLOW ALOFT. THIS WILL PUMP UP THE TEMPERATURES BOTH
SUNDAY AND MONDAY, WITH A 75-85 PERCENT CHANCE OF EXCEEDING 90
DEGREES IN THE LOWER VALLEYS ON MONDAY. WINDS ARE EXPECTED TO
PICK UP FROM THE SOUTHWEST MONDAY AFTERNOON, ESPECIALLY ACROSS
EASTERN OREGON. THESE INCREASING WINDS IN COMBINATION WITH LOW
RELATIVE HUMIDITY, ARE EXPECTED TO CREATE AN ELEVATED RISK OF
DANGEROUS FIRE WEATHER CONDITIONS FOR PORTIONS OF MALHEUR AND
HARNEY COUNTIES. ANYONE WITH OUTDOOR PLANS ON MONDAY ACROSS
EASTERN OREGON SHOULD MONITOR THE SITUATION CLOSELY.
LONG TERM /TUESDAY THROUGH SATURDAY/
UNSETTLED CONDITIONS ARE EXPECTED FOR MUCH OF THE WEEK AS A
TROUGH OF LOW PRESSURE WORKS THROUGH THE REGION. GUIDANCE IS
COMING INTO FOCUS ON A TROUGH PATH THAT BRINGS THE LOW INTO
NORTHERN NEVADA EARLY IN THE WEEK BEFORE LIFTING IT NORTHWARD
THROUGH IDAHO AND EVENTUALLY INTO MONTANA. ENOUGH MOISTURE IS
FORECAST THAT MOST AREAS WILL SEE MEASURABLE PRECIPITATION.
TEMPERATURES WILL DROP TO 10-15 DEGREES BELOW NORMAL TUESDAY
THROUGH THURSDAY, AND SNOW LEVELS ARE EXPECTED TO DROP BELOW
8000 FEET WEDNESDAY. BEHIND THE TROUGH THERE IS GOOD AGREEMENT
THAT HIGH PRESSURE WILL AGAIN BUILD ACROSS THE REGION INTO THE
WEEKEND.
AVIATION /18Z SATURDAY THROUGH SUNDAY/
ISSUED 1108 AM MDT SAT MAY 23 2026
VFR. SOME HIGH CLOUDS TODAY AND A FEW BUILD-UPS NEAR KTWF/KJER
THIS AFTERNOON. AN ISOLATED SHOWER/THUNDERSTORM IS POSSIBLE NEAR
THE NEVADA BORDER. SURFACE WINDS LESS THAN 10KT BECOMING WNW
5-15 KT WITH HIGHER GUSTS IN TYPICALLY BREEZY AREAS AFTER 20Z.
WINDS ALOFT AT 10KFT: WNW 20-30 KT.
KBOI...VFR WITH SOME HIGH CLOUDS. SURFACE WINDS BECOMING NW 8-12
KT AFTER 20Z THEN RETURNING TO SE LESS THAN 10 KT AFTER 02Z THIS
EVENING.
SUNDAY OUTLOOK...VFR WITH DIURNALLY DRIVEN WIND SHIFTS AND
INCREASING CLOUDS LATE IN THE DAY. AN ISOLATED
SHOWER/THUNDERSTORM REMAINS A POSSIBILITY NEAR THE NEVADA BORDER
DURING THE AFTERNOON HOURS.
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...MC
LONG TERM....MC
AVIATION.....MC
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