828
FXUS65 KBOI 180243
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
843 PM MDT WED SEP 17 2025
DISCUSSION
WARM TEMPERATURES AND CLEAR SKIES WILL CONTINUE
THIS EVENING UNDER A HIGHLY AMPLIFIED RIDGE. THURSDAY WILL
LIKELY BE THE HOTTEST DAY, WITH TEMPERATURES REACHING THE MID-
TO UPPER 80S IN LOWER ELEVATIONS, APPROXIMATELY 10 DEGREES ABOVE
NORMAL. AN AREA OF DEEP MOISTURE WILL BE DRAWN NORTHWARD
THROUGH THE GREAT BASIN ON THURSDAY, WITH THE PERIPHERY OF THIS
MOISTURE REACHING THE REGION LATE THURSDAY. THIS WILL RESULT IN
INCREASED CLOUD COVER THURSDAY NIGHT, WITH A SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS (10-15%) ALONG THE NEVADA BORDER
FRIDAY AFTERNOON. NO SIGNIFICANT FORECAST UPDATES ARE NEEDED AT
THIS TIME.
AVIATION
VFR. LAYERS OF SMOKE ALOFT PRODUCING SOME REDUCTION
IN VISIBILITY. SURFACE WINDS: E-S 5-15KT. WINDS ALOFT AT 10KFT
MSL: VARIABLE UP TO 10 KT.
KBOI...VFR WITH LIGHT WINDS. SMOKE LAYERS ALOFT.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...CLEAR AND MILD
TONIGHT INTO THURSDAY AS THE REGION REMAINS UNDER A SHARP UPPER
RIDGE. AN AREA OF DEEP MOISTURE WILL GET DRAWN NORTHWARD THROUGH
THE GREAT BASIN THURSDAY, EDGING INTO OUR REGION LATE THUR/FRI.
INITIALLY IT WILL RESULT IN INCREASED CLOUD COVER THURSDAY NIGHT
AND FRIDAY WITH A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS
(10-15%) ACROSS SE OREGON (HARNEY AND SOUTHERN MALHEUR
COUNTIES) AND THE ID/NV BORDER ON FRIDAY. THURSDAY WILL LIKELY
BE THE HOTTEST DAY WITH TEMPERATURES AROUND 10 DEGREES ABOVE
NORMAL AS LOWER ELEVATIONS REACH THE MID-UPPER 80S. FRIDAY
REMAINS WARM, BUT CLOUD COVER WILL TAKE A COUPLE OF DEGREES OFF
THURSDAY'S HEAT
LONG TERM...SATURDAY THROUGH WEDNESDAY...REMAINS WARM AND
MOSTLY DRY ON SATURDAY WITH LOW PRECIPITATION CHANCES ACROSS SE
OREGON AND THE ID/NV BORDER AREA, SIMILAR TO FRIDAY. A TROUGH
ENTERS THE PAC NW ON SUNDAY, AND MODELS HAVE TRENDED FURTHER
SOUTH AND ARE PRESENTING A STRONGER SOLUTION. THE BEST CHANCE OF
PRECIPITATION REMAINS ACROSS E-CENTRAL OREGON AND THE W-CENTRAL
ID MTNS SUNDAY/SUNDAY NIGHT. GIVEN THE TREND IN THE 12Z
DETERMINISTIC SOLUTIONS, WOULDN'T BE SURPRISED IF THE NUMBERS
INCREASE IN THE ENSEMBLE SOLUTION ACROSS NORTHERN ZONES FOR
THIS PERIOD. THE PASSING TROUGH WILL TAKE ABOUT 5 DEGREES OFF
TEMPERATURES FOR SUN/MON, BRINGING THEM BACK CLOSER TO NORMAL.
GOOD CONFIDENCE IN AN UPPER RIDGE BUILDING INTO THE AREA FOR
TUE/WED WITH TUESDAY SHOWING A 20-35% CHANCE OF TOPPING 90
DEGREES ACROSS THE LOWER SNAKE PLAIN. ANOTHER TROUGH COULD ENTER
THE PICTURE LATE WEDNESDAY.
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...JDS
AVIATION.....JDS
SHORT TERM...DG
LONG TERM....DG
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