353
FXUS65 KBOI 240534
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1134 PM MDT SAT MAY 23 2026
UPDATE
UPDATED AVIATION DISCUSSION.
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/
ISSUED 203 PM MDT SAT MAY 23 2026
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/
ISSUED 203 PM MDT SAT MAY 23 2026
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 /06Z SUNDAY THROUGH MONDAY/
ISSUED 1133 PM MDT SAT MAY 23 2026
VIRGA/ISOLATED THUNDERSTORMS RETURN NEAR THE ID-NV BORDER
SUNDAY AFTERNOON INTO EVENING, CAPABLE OF OUTFLOW GUSTS TO
35-45 KT AND BLOWING DUST. SURFACE WINDS: VARIABLE UP TO 10 KT,
THEN SW- NW 5-15 KT AFTER SUN/16Z. WINDS ALOFT AT 10KFT: W-SW
10-20 KT.
KBOI...VFR. SURFACE WINDS: SE OR VARIABLE AROUND 5 KT, THEN NW-N
5-10 KT AFTER SUN/15Z. OCCASIONAL AFTERNOON GUSTS TO 15 KT.
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...MC
LONG TERM....MC
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