388
FXUS65 KBOI 140244
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
844 PM MDT TUE MAY 13 2025
DISCUSSION
MUCH OF THE SHOWER AND THUNDERSTORM ACTIVITY FROM
THIS EVENING HAS DIMINISHED. THE CHANCE FOR SHOWERS WILL
CONTINUE OVER OVERNIGHT ACROSS FAR SE OREGON AND PORTIONS OF SW
IDAHO, MAINLY OWYHEE COUNTY INTO THE WESTERN MAGIC VALLEY. THE
LOSS OF DAYTIME HEATING WILL CUT OFF ANY THUNDERSTORM THREAT
THROUGH WEDNESDAY MORNING. WINDS WILL REMAIN BREEZY OUT OF THE
NW, WITH STRONGER GUSTS LIMITED TO THE SNAKE PLAIN EAST OF
MOUNTAIN HOME. CURRENT FORECAST IS ON TRACK FOR TONIGHT.
AVIATION
MAINLY VFR. SCATTERED SHOWERS MOVING S-SE TONIGHT INTO
WEDNESDAY MORNING. SHOWERS MAY CREATE LOCALIZED MVFR/IFR CONDITIONS.
MOUNTAIN OBSCURATION IN LOW CLOUDS/SHOWERS. SNOW LEVELS: 6-7K FEET
MSL. SURFACE WINDS: W-NW 10-20 KT WITH GUSTS 25-30 KT, DECREASING TO
5-15 KT TONIGHT...EXCEPT REMAINING STRONG FROM MUO TO KTWF/KJER.
WINDS ALOFT AT 10KFT MSL: N TO NW 10-25 KT.
KBOI...VFR. BRIEF SHOWERS AND LOWER CLOUD CEILINGS MAY CONTINUE
THROUGH THE EVENING. WINDS W-NW 5-15 KT TONIGHT, INCREASING TO 10-20
KT WITH GUSTS TO 30 KT WEDNESDAY MORNING AND AFTERNOON.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...AN UPPER LOW WILL
CONTINUE TO SUPPORT SHOWERS AND ISOLATED THUNDERSTORMS THROUGH
THIS EVENING. SOME OF THE STORMS MAY PRODUCE GUSTY OUTFLOW
WINDS AND SMALL HAIL. SNOW LEVELS BETWEEN 6500 AND 7000 FEET
COULD RESULT IN LIGHT SNOW ACCUMULATIONS ON THE HIGHER
MOUNTAINS. THE LOW WILL MOVE FURTHER EAST ON WEDNESDAY SO THE
CHANCE FOR SHOWERS IS LOWER AND FAVORED OVER THE HIGHER
ELEVATIONS OF SW IDAHO. INSTABILITY REMAINS MINIMAL, BUT ENOUGH
FOR A SLIGHT CHANCE (<= 20 PERCENT) OF THUNDERSTORMS IN CENTRAL
AND S-CENTRAL IDAHO IN THE AFTERNOON. THE LOW MOVES EAST OF THE
AREA AS A WEAK UPPER RIDGE REPLACES IT ON THURSDAY FOR DRY
CONDITIONS. TEMPERATURES REMAIN COOL IN THIS PATTERN ALONG WITH
BREEZY WINDS.
LONG TERM...FRIDAY THROUGH TUESDAY...A WEAK, SHORTWAVE TROUGH
WILL PASS THROUGH THE FORECAST AREA ON FRIDAY. THIS DISTURBANCE
WILL INCREASE SHOWER AND THUNDERSTORM CHANCES, MAINLY FOR THE
HIGHER TERRAIN OF SW IDAHO. A LARGE LOW PRESSURE SYSTEM WILL
ARRIVE SATURDAY, SUPPORTING WIDESPREAD PRECIPITATION WITH 6K-7K
FEET MSL SNOW LEVELS ACROSS SE OREGON AND SW IDAHO.
THUNDERSTORMS WILL BE POSSIBLE AS CONDITIONS BECOME MORE
UNSTABLE IN THE AFTERNOON. IN ADDITION, WINDS WILL BECOME BREEZY
AHEAD OF THE LOW ON SATURDAY, BUT TEMPERATURES SHOULD REMAIN
AROUND NORMAL. THE LOW IS FORECAST TO CONTINUE SOUTH AND EAST ON
SUNDAY, WITH SHOWER COVERAGE DECREASING IN ITS WAKE. THE SURFACE
PRESSURE GRADIENT WILL TIGHTEN BEHIND THE COLD FRONT SUNDAY AND
CREATE WINDY CONDITIONS ACROSS SE OREGON AND THE WESTERN SNAKE
PLAIN. TEMPERATURES WILL BE APPROXIMATELY 5-10 DEGREES COOLER AS
NORTHWESTERLY FLOW MOVES OVERHEAD. WINDS WILL DECREASE BUT
REMAIN BREEZY ON MONDAY AS WEAK HIGH PRESSURE STARTS TO BUILD
IN FROM THE EAST. LINGERING MOUNTAIN SHOWERS WILL DIMINISH BY
MONDAY EVENING. TEMPERATURES ARE EXPECTED TO REBOUND TO AROUND
NORMAL FOR MONDAY AND TUESDAY.
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
DISCUSSION...DG
AVIATION.....JY
SHORT TERM...BW
LONG TERM....SH
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