483
FXUS65 KBOI 040247
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
846 PM MDT TUE JUN 3 2025
DISCUSSION
NO FORECAST CHANGES. NORTHWEST FLOW ALOFT WILL
CONTINUE THROUGH FRIDAY BETWEEN AN UPPER RIDGE IN THE EASTERN
PACIFIC AND A BROAD UPPER TROUGH CENTERED ROUGHLY OVER THE
ROCKY MOUNTAINS. BOTH THE RIDGE AND TROUGH WILL SHIFT SLOWLY
EASTWARD RESULTING IN STEADY WARMING (4-6 DEGREES PER DAY) AND
DECREASING NORTHWEST WINDS. HOTTEST DAYS SHOULD BE MONDAY AND
TUESDAY WHEN THE UPPER RIDGE PASSES DIRECTLY OVERHEAD. HIGH
TEMPS ON THOSE DAYS SHOULD REACH 95 TO 100 DEGREES IN OUR LOWER
SOUTHERN VALLEYS. AS THE PACIFIC RIDGE MOVES EASTWARD A WEAK
UPPER LOW IN THE DESERT SOUTHWEST WILL BE SHIFTING WESTWARD,
AND MID/HIGH LEVEL MOISTURE WILL GRADUALLY INCREASE IN THE
GREAT BASIN. THIS WILL LEAD TO A 10-20 PERCENT CHANCE OF HIGH-
BASED THUNDERSTORMS IN OUR SOUTHERN AREAS ON THE HOTTEST DAYS.
LONGER RANGE MODELS SHOW A COOLDOWN NEXT WEEK AS AN UPPER TROUGH
FROM THE GULF OF ALASKA REPLACES THE UPPER RIDGE.
AVIATION
VFR. SURFACE WINDS: N-NW 10-20 KT WITH GUSTS UP TO
18-28 KT THIS EVENING, BECOMING VARIABLE 5-12 KT AFTER SUNSET.
WINDS ALOFT AT 10KFT MSL: N-NW 10-20 KT.
KBOI...VFR. SURFACE WINDS: NW 10-15 KT GUSTING TO 25 KT THIS
EVENING. BECOMING VARIABLE UNDER 10 KT OVERNIGHT.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...
THE FORECAST AREA WILL REMAIN UNDER THE INFLUENCE OF DRY
NORTHWEST FLOW AS A STRONG UPPER LEVEL RIDGE REMAINS SITUATED
OFF THE COAST WHILE AN UPPER TROUGH EXTENDS FROM THE NORTHERN
PLAINS ACROSS THE GREAT BASIN. THE PRESSURE GRADIENT WILL RELAX
TOMORROW RESULTING IN CONSIDERABLY LESS WIND WHILE TEMPERATURES
BEGIN AN UPWARD TREND. OTHER THAN SOME PASSING HIGH CLOUDS AND
DIURNAL CUMULUS OVER THE HIGHER TERRAIN, MOSTLY SUNNY/CLEAR
CONDITIONS WILL PREVAIL.
LONG TERM...FRIDAY THROUGH TUESDAY...A STRONG UPPER LEVEL
RIDGE WILL BUILD INTO THE NORTHWEST REGION FRIDAY AND THROUGH
THE WEEKEND. THIS RIDGING IS EXPECTED TO BRING HOT TEMPERATURES
ACROSS THE AREA LATER IN THE WEEKEND FROM SUNDAY TO MONDAY,
WITH A 5-10% CHANCE OF 100 DEGREE HIGH TEMPERATURES IN THE
LOWER VALLEYS FOR BOTH DAYS. ON MONDAY AND TUESDAY, LONG-RANGE
GUIDANCES GENERALLY INDICATE A WEAK TROUGH MOVING ONTO THE
NORTHWEST COAST. THERE IS CONSIDERABLE UNCERTAINTY OVER THE
TIMING AND MAGNITUDE OF THIS TROUGH EARLY NEXT WEEK, BUT
CURRENT GUIDANCES PROJECT A SLIGHT (10- 20%) CHANCE OF
AFTERNOON SHOWERS AND THUNDERSTORMS TO THE AREA ON MONDAY AND
TUESDAY, MOSTLY IN HIGHER ELEVATIONS. BREEZY AFTERNOON WINDS
ARE GENERALLY EXPECTED THROUGHOUT THE LONG-TERM 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...LC
AVIATION.....NF
SHORT TERM...TL
LONG TERM....JY
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