255
FXUS65 KBOI 060609
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1209 AM MDT WED MAY 6 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- WINDY THIS AFTERNOON AND TONIGHT.
- ISOLATED AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS TODAY
OVER THE MOUNTAINS OF S IDAHO AND SE OREGON, OTHERWISE DRY.
- ABOVE NORMAL TEMPERATURES WILL CONTINUE, AS MUCH AS 15-20
DEGREES ABOVE NORMAL NEXT MONDAY AND TUESDAY.
SHORT TERM /THROUGH FRIDAY NIGHT/
ISSUED 207 PM MDT TUE MAY 5 2026
ISOLATED SHOWERS AND THUNDERSTORMS (15-25 PERCENT AREAL COVERAGE)
IN AND NEAR THE MAGIC VALLEY LATE THIS AFTERNOON AND EVENING AS
HI-RES MODELS SHOW A DISTINCT CONVERGENCE ZONE THERE, AND ENOUGH
LIFT TO GENERATE CLOUDS AND PCPN. MODELS DEPICT LARGE SCALE
NORTHERLY SURFACE WINDS ENTERING THE SNAKE BASIN THROUGH BOTH
OREGON AND MONTANA AND CONVERGING IN THE MAGIC VALLEY. THE
STRONGER PORTION FROM MONTANA WILL PUSH THE CONVERGENCE ZONE
WESTWARD OVERNIGHT AS A "BACK DOOR" COLD FRONT, ALL THE WAY PAST
BOISE BY SUNRISE. THE AIR FROM MONTANA IS VERY DRY, BUT TONIGHT
WILL BE TOO WINDY TO ALLOW FULL RADIATIONAL COOLING ONCE SKIES
CLEAR. WEDNESDAY LOOKS SUNNY, DRY, LESS WINDY, AND SLIGHTLY
COOLER THAN TODAY. WEDNESDAY NIGHT SHOULD BE CLEAR, DRY, AND
CALMER, BUT BY THEN THE NEXT WARMER AIR MASS WILL APPROACH FROM
THE WEST, OFFSETTING THE BETTER CONDITIONS FOR RADIATIONAL
COOLING. SO WEDNESDAY NIGHT SHOULD BE NO COOLER THAN TONIGHT.
THURSDAY LOOKS SUNNY AND 3 TO 6 DEGREES WARMER THAN WEDNESDAY,
AND THURSDAY NIGHT LOOKS CLEAR AND COOL.
LONG TERM /SATURDAY THROUGH WEDNESDAY/
ISSUED 207 PM MDT TUE MAY 5 2026
A BRIEF COOLDOWN WILL COMMENCE FRIDAY INTO SATURDAY AS A WEAK AND
DRY COLD FRONT MOVES THROUGH THE REGION. HOWEVER, THE HEAT WILL
BUILD EARLY NEXT WEEK IN ASSOCIATION WITH A STRONG AREA OF HIGH
PRESSURE ALOFT OVER THE WESTERN UNITED STATES. MONDAY IS CURRENTLY
FORECAST TO SEE THE HOTTEST TEMPERATURES OF THE YEAR SO FAR, PEAKING
AT 15 TO 20 DEGREES NORMAL. LATEST PROBABILITIES SUGGEST A 50-80%
CHANCE OF A HIGH TEMPERATURE ABOVE 90 DEGREES IN THE SNAKE PLAIN AND
OVER LOWER ELEVATIONS OF SOUTHEAST OREGON. TUESDAY WILL ALSO BE HOT,
THOUGH PERHAPS A FEW DEGREES COOLER THAN MONDAY. PRECIPITATION
CHANCES WILL BE NEAR ZERO THROUGHOUT THE PERIOD, WITH ONLY A SLIGHT
CHANCE OF SHOWERS ON SATURDAY IN THE CENTRAL IDAHO MOUNTAINS.
AVIATION /06Z WEDNESDAY THROUGH THURSDAY/
ISSUED 1209 AM MDT WED MAY 6 2026
VFR. SCATTERED CUMULUS DEVELOPING OVER THE HIGHER TERRAIN IN THE
AFTERNOON. LOCALIZED SMOKE NEAR FIRE ACTIVITY. SURFACE WINDS: N-NW 5-
10 KT, BECOMING E-SE 5-15 KT FROM EAST TO WEST OVERNIGHT. GUSTS 20-
30 KT THROUGH THE SNAKE PLAIN. WINDS IN THE AFTERNOON BECOMING W-NW
5-15 KT WITH GUSTS TO 20 KT. WINDS ALOFT AT 10KFT MSL: N 15-30 KT,
BECOMING W-NW 15-25 KT AFTER WED/18Z.
KBOI...VFR. SURFACE WINDS: NW 6-11 KT, BECOMING SE 8-15 KT AFTER
WED/09Z WITH GUSTS 20-25 KT IN THE MORNING. WINDS BECOMING NW 7-12
KT IN THE AFTERNOON.
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.....ST
SHORT TERM...LC
LONG TERM....JR
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