651
FXUS65 KBOI 180246
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
846 PM MDT THU JUL 17 2025
DISCUSSION
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS
CONTINUE TO MOVE EAST ACROSS THE SOUTHERN PORTION OF THE CWA,
GENERALLY SOUTH OF A LINE FROM ROME, OR TO TWIN FALLS, ID. CLOUD
TO GROUND LIGHTNING HAS BEEN LIMITED SO FAR, AND THAT'S A GOOD
THING BECAUSE STORMS ARE NOT PRODUCING LARGE AREAS OF WETTING
RAIN. NO SIGNIFICANT NEW FIRES HAVE BEEN REPORTED SO FAR. WE
EXPECT THE CONVECTION TO DIMINISH THIS EVENING AND BE GONE BY
MIDNIGHT LOCAL TIME. ADDITIONAL STORMS ARE POSSIBLE IN OWYHEE
AND TWIN FALLS COUNTIES FRIDAY AFTERNOON AND EVENING, BUT ONCE
AGAIN THE COVERAGE SHOULD ONLY BE ISOLATED. OTHERWISE, HIGH
TEMPERATURES WERE 5 TO 10 DEGREES ABOVE NORMAL TODAY, WITH
READINGS TOPPING OUT NEAR 100 OVER MUCH OF THE LOWER ELEVATIONS.
BOISE HIT 98, MOUNTAIN HOME HIT 99, AND ROME, OR HIT AN EVEN
100. TEMPERATURES ARE FORECAST TO BE AS WARM OR JUST A HAIR
WARMER TOMORROW IN THE TREASURE VALLEY, AND SLIGHTLY COOLER OVER
MOST OF THE REMAINING AREA. AN UPDATE WAS DONE PREVIOUSLY, AND
NO FURTHER UPDATE IS PLANNED AT THIS TIME.
AVIATION
VFR. SMOKE ALOFT WILL CONTINUE THROUGH EVENING/OVERNIGHT,
MOSTLY NEAR KBNO AND KBKE. ISOLATED THUNDERSTORMS ALONG THE
ID/OR/NV BORDER WILL WEAKEN THIS EVENING. THUNDERSTORM OUTFLOW
GUSTS UP TO 40 KTS EXPECTED TO CONTINUE OVER THE OWYHEE
MOUNTAINS AND LOWER MAGIC VALLEY. SURFACE WINDS:
W/NW 5-15 KT, WITH GUSTS NEAR 20 KTS MAINLY OVER SE OR THIS
EVENING. WINDS ALOFT AT 10KT MSL: W 10-20 KT.
KBOI...VFR. SURFACE WINDS: NW 5-10 KT BECOMING VARIABLE UNDER 7 KT
TONIGHT.
WEEKEND OUTLOOK...ISOLATED THUNDERSTORMS ALONG ID/NV BORDER FRIDAY
AFTERNOON. OTHERWISE, MOSTLY CLEAR EXCEPT FOR OCCASIONAL SMOKE ALOFT
FROM E-CENTRAL OR AND W-CENTRAL ID MOUNTAINS. SURFACE WINDS: W-NW 5-
15 KT, WITH AFTERNOON GUSTS 15-25 KT.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT...FLOW ALOFT HAS
SHIFTED TO THE WEST-SOUTHWEST WHICH HAS ALLOWED SOME MID LEVEL
MOISTURE TO MOVE INTO THE AREA. ISOLATED SHOWERS AND
THUNDERSTORMS EXPECTED LONG THE NV BORDER THIS AFTERNOON, MAINLY
OVER THE HIGHER TERRAIN OF THE OWYHEE MOUNTAINS AND SOUTHERN
TWIN FALLS HIGHLANDS. WILDFIRE SMOKE REMAINS OVER THE AREA FROM
FIRES IN WESTERN OR AND NORTHERN CA, WITH REDUCED VISIBILITIES
ALOFT. ISOLATED THUNDERSTORMS EXPECTED ALONG THE NV BORDER AND
OWYHEE MOUNTAINS AND IN CENTRAL OR WEST OF HARNEY COUNTY THROUGH
THIS EVENING. MAIN THREATS WITH THE THUNDERSTORMS WILL BE GUSTY
ERRATIC OUTFLOW WINDS UP TO 45 MPH. THE THUNDERSTORM THREAT
SHIFTS EAST INTO CENTRAL AND EASTERN IDAHO ON FRIDAY, WITH
ISOLATED THUNDERSTORMS GENERALLY EAST OF A LINE FROM MOUNTAIN
HOME TO STANLEY. TEMPERATURES WILL BE AROUND 100F IN THE LOWER
VALLEYS AGAIN ON FRIDAY. BY SATURDAY, DRY AIR IS ADVECTED INTO
THE REST OF THE AREA WITH BREEZY CONDITIONS AND SLIGHTLY COOLER
CONDITIONS AS A TROUGH SLOWLY MOVES SOUTH ACROSS BRITISH
COLUMBIA. TEMPERATURES LOWER AROUND 5 TO 8 DEGREES ON SATURDAY.
LONG TERM...SUNDAY THROUGH THURSDAY...A POTENT UPPER-LEVEL
LONGWAVE TROUGHING PATTERN WILL CONTINUE TO MOVE THROUGH THE
PACIFIC NORTHWEST TO START THE PERIOD. IT WILL BECOME OVERHEAD
OF THE AREA EARLY MONDAY. THIS WILL CAUSE TEMPERATURES TO BE 5
DEGREES BELOW NORMAL MONDAY AND TUESDAY. PRECIPITATION CHANCES
WILL ALSO INCREASE TO NOTABLE AMOUNTS MONDAY AND TUESDAY, WITH
POPS HOVERING NEAR 15-20% ALONG OUR NORTHERN AND WESTERN ZONES.
THUNDERSTORMS WILL BE POSSIBLE DURING THE AFTERNOON INTO EVENING
TIME PERIOD. THE UPPER-LEVEL TROUGH WILL LINGER THROUGH TUESDAY,
AND THEN THE PORTION OVER NORTHERN CALIFORNIA WILL SPLIT INTO A
CUTOFF LOW WHILE THE REST OF THE TROUGHING WILL CARRY OFF TO THE
EAST. WITH THIS SEMI-PERMANENT LOW OFF THE CALIFORNIA COAST
THROUGH THE EXTENDED, SOUTHWEST FLOW WILL BE DOMINANT WEDNESDAY
ONWARD. THIS WILL CAUSE TEMPERATURES TO BE NEAR NORMAL WEDNESDAY
AND THURSDAY. THIS PATTERN WILL KEEP AFTERNOON WINDS BREEZY
THROUGH THE PERIOD.
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...SP
AVIATION.....JY
SHORT TERM...KA
LONG TERM....CH
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