404
FXUS65 KBOI 101227
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
627 AM MDT SUN MAY 10 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- ABOUT TEN DEGREES HOTTER SUNDAY, WITH LOWER ELEVATIONS
REACHING 90 DEGREES FOR THE FIRST TIME THIS YEAR.
- RECORD HIGH TEMPS ON TUESDAY WITH TEMPERATURES IN THE MID TO
UPPER 90S IN THE LOWER VALLEYS.
- COOLER WEDNESDAY WITH A CHANCE OF SHOWERS AND THUNDERSTORMS.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 232 AM MDT SUN MAY 10 2026
STRONG HIGH PRESSURE BUILDING OVER THE NORTHWEST REGION WILL
BRING UNSEASONABLY WARM TEMPERATURES ACROSS THE AREA ON SUNDAY,
WITH VALLEYS EXPECTED TO REACH THE LOWER 90S FOR THE FIRST TIME
THIS YEAR. A WEAK SHORTWAVE TROUGH PASSING NORTH OF OUR AREA
WILL BRING STRONG WIND GUSTS UP TO 35 MPH OVER EAST-CENTRAL OR
NEAR BAKER COUNTY AND NORTHERN MALHEUR COUNTY LATE SUNDAY NIGHT
INTO EARLY MORNING MONDAY. A SLIGHT COOLDOWN IS EXPECTED MONDAY,
WITH PEAK TEMPERATURES EXPECTED TO HOVER IN THE MID 80S. A
POWERFUL RIDGE OF HIGH PRESSURE WILL QUICKLY BUILD INTO THE
ENTIRE WESTERN CONUS ON TUESDAY, BRINGING EXCEPTIONALLY WARM
TEMPERATURES OVER OUR AREA. MOST VALLEY AREAS ARE EXPECTING TO
SEE PEAK TEMPERATURES IN THE MID TO UPPER 90S, LIKELY BREAKING
DAILY RECORDS. THE RIDGE MAY STEER SOME UPPER MOISTURE OVER THE
GREAT BASIN LATE TUESDAY, POTENTIALLY FAVORING SOME HIGH CLOUDS
AND SCATTERED DRY THUNDERSTORMS OVER THE ID/NV BORDER AREA.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 232 AM MDT SUN MAY 10 2026
A TROUGH WILL APPROACH THE REGION ON WEDNESDAY WITH SOUTHERLY FLOW
OVER THE AREA. SUBTROPICAL MOISTURE WILL MOVE NORTHWARD FROM BAJA ON
WEDNESDAY, WITH PRECIPITABLE WATER VALUES REACHING THE 90TH
PERCENTILE. THIS COMBINED WITH THE TROUGH MOVING INLAND WILL TRIGGER
SCATTERED SHOWERS AND THUNDERSTORMS ON WEDNESDAY AFTERNOON AND
EVENING. FORECAST PRECIPITATION SHOULD BE HIGHER THAN WHAT IS IN
THERE. SHEAR VALUES ARE SUFFICIENT TOO FOR A SEVERE WEATHER THREAT
WITH A FEW ORGANIZED STRONG STORMS POSSIBLE. THE TROUGH MOVES INLAND
OVER SOUTHEAST OR AND SOUTHWEST ID ON THURSDAY WITH GOOD MODEL
AGREEMENT. THE CURRENT WPC/NBM FORECAST DOES NOT REFLECT THIS
TROUGH, SO TEMPERATURES ARE AROUND 10 TO 15 DEGREES TOO WARM FOR
THIS EVENT AND PROBABILITY OF PRECIPITATION SHOULD BE RAIN
LIKELY FOR MOST OF THE AREA ON THURSDAY. COOLER TEMPERATURES
CONTINUE INTO SUNDAY BEHIND THE TROUGH WITH ZONAL FLOW OVER THE
AREA. CURRENT FORECAST IS TOO WARM FRIDAY THROUGH SUNDAY.
AVIATION /12Z SUNDAY THROUGH MONDAY/
ISSUED 624 AM MDT SUN MAY 10 2026
VFR. SURFACE WINDS: SW-SE 10KT THIS MORNING INCREASING TO 10-20KT
THIS AFTERNOON, BECOMING NW 10-20KT THIS EVENING WITH GUSTS UP
TO 30KT NEAR KONO KBKE AFTER SUNSET. WINDS ALOFT AT 10KFT MSL:
SW 15-25KT.
KBOI...VFR. SE WINDS 10-20KT BECOMING NW 10KT AFTER SUNSET.
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.....KA
SHORT TERM...JY
LONG TERM....KA
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