590
FXUS65 KBOI 040935
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
335 AM MDT SAT JUL 4 2026
KEY MESSAGES
- HOT WEATHER EXPECTED THROUGH INDEPENDENCE DAY HOLIDAY
WEEKEND.
- SLIGHT CHANCE OF THUNDERSTORMS OVER CENTRAL ID MOUNTAINS,
SOUTHEAST OR, AND FAR SOUTHWEST ID LATE SUNDAY, WITH CHANCES
EXPANDING AREA-WIDE MONDAY.
- HOT AND DRY WITH PERIODS OF BREEZY CONDITIONS THROUGH NEXT
WEEK.
SHORT TERM /THROUGH MONDAY NIGHT/
AN UPPER LEVEL RIDGE CENTERED OVER THE SOUTHERN PLAINS/FOUR
CORNERS REGION WILL BUILD NORTH TODAY AND SUNDAY. THE RIDGE AND
SOUTHWEST FLOW ALOFT WILL BRING HOT TEMPERATURES TO THE AREA,
WITH HIGH TEMPERATURES INCREASING 5-8 DEGREES TODAY AND ANOTHER
COUPLE OF DEGREES ON SUNDAY. THIS WILL PLACE HIGH TEMPERATURES
IN THE MID TO UPPER 90S IN THE LOWER ELEVATIONS, WITH THE
HOTTEST LOCATIONS APPROACHING 100 DEGREES ON SUNDAY. IN BOISE,
THERE IS ABOUT A 30% CHANCE OF REACHING TRIPLE DIGITS. IN THE
MOUNTAIN VALLEYS, HIGHS WILL BE IN THE 80S TO LOWER 90S. SKIES
TODAY WILL BE MOSTLY SUNNY WITH SOME AFTERNOON CUMULUS OVER THE
HIGHER TERRAIN. HOWEVER, THERE WILL BE A STABLE LAYER ALOFT
PREVENTING FURTHER DEVELOPMENT INTO SHOWERS OR THUNDERSTORMS. BY
SUNDAY, FORECAST SOUNDINGS INDICATE THIS LAYER WILL BE REMOVED
WITH AN INCREASE IN MID-LEVEL MOISTURE. THIS WILL ALLOW FOR A
20% CHANCE OF SHOWERS AND THUNDERSTORMS TO DEVELOP OVER THE
HIGHER TERRAIN ACROSS SOUTHEAST OREGON, FAR SOUTHWEST IDAHO, AND
THE CENTRAL IDAHO MOUNTAINS. DUE TO LIMITED MOISTURE, LIGHTNING
AND GUSTY OUTFLOW WINDS WILL BE THE PRIMARY THREATS, WITH GUSTS
40-60 MPH POSSIBLE. OUTSIDE OF STORMS, EXPECT BREEZY CONDITIONS
ACROSS EASTERN OREGON THIS EVENING WITH GUSTS 20-35 MPH,
BECOMING MORE WIDESPREAD SUNDAY.
A WEAK SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA SUNDAY NIGHT
AND MONDAY. THE TROUGH WILL CONTINUE A SLIGHT CHANCE OF SHOWERS
AND THUNDERSTORMS OVERNIGHT ACROSS EASTERN OREGON AND FAR
WESTERN IDAHO, WITH ADDITIONAL DEVELOPMENT ON MONDAY AFTERNOON
ACROSS THE HIGHER TERRAIN. THE TROUGH WILL ALSO REDUCE HIGH
TEMPERATURES BY 3-5 DEGREES AND BRING BREEZY CONDITIONS.
LONG TERM /TUESDAY THROUGH SATURDAY/
A 10-30% CHANCE OF SHOWERS AND THUNDERSTORMS WILL CONTINUE INTO
TUESDAY OVER THE HIGHER TERRAIN AS ENOUGH MOISTURE LINGERS UNDER
SOUTHWESTERLY FLOW. THE FLOW ALOFT WILL TRANSITION TO WESTERLY
WEDNESDAY AND THURSDAY AS A TROUGH MOVES BY TO THE NORTH,
PUSHING MOISTURE TO THE EAST. ADDITIONALLY, WINDS WILL BECOME
BREEZY AND BY THURSDAY, TEMPERATURES WILL COOL TO AROUND NORMAL.
FOR FRIDAY INTO THE WEEKEND, THE FOUR CORNERS HIGH IS EXPECTED
TO STRENGTHEN AND BUILD NORTH WHILE A TROUGH DEEPENS OFF THE
COAST. SOUTHWEST FLOW WILL BRING INCREASING TEMPERATURES AND
BREEZY CONDITIONS. CURRENTLY, ENSEMBLES SLIGHTLY FAVOR SOME
INFLUENCE FROM THE TROUGH, KEEPING TEMPERATURES IN CHECK.
HOWEVER, IF THE RIDGE BUILDS FURTHER WEST, VERY HOT TEMPERATURES
WOULD DEVELOP ACROSS THE AREA OVER THE WEEKEND.
AVIATION /06Z SATURDAY THROUGH SUNDAY/
ISSUED 1221 AM MDT SAT JUL 4 2026
VFR. A FEW CUMULUS OVER THE HIGHER TERRAIN AND ALONG THE NEVADA
BORDER IN THE AFTERNOON AND EVENING, OTHERWISE CLEAR SKIES. HIGH
DENSITY ALTITUDE IN THE AFTERNOON/EVENING DUE TO HEAT. SURFACE
WINDS: VARIABLE 10 KT OR LESS, BECOMING SW-NW 5-15 KT IN THE
AFTERNOON. NW GUSTS 20-30 KT KBKE TO KONO IN THE EVENING. WINDS
ALOFT AT 10KFT MSL: SW 10-20 KT.
KBOI...VFR UNDER CLEAR SKIES. SURFACE WINDS: SE 5-10 KT, THEN
NW 7-12 KT IN THE AFTERNOON.
SUNDAY OUTLOOK...MAINLY VFR. ISOLATED THUNDERSTORMS OVER
SE OREGON AND FAR SW IDAHO LATE AFTERNOON/EVENING. HIGH DENSITY
ALTITUDE IN THE AFTERNOON/EVENING DUE TO HEAT. GUSTY OUTFLOW
WINDS FROM SHOWERS AND THUNDERSTORMS UP TO 50 KT. SURFACE
WINDS: W-NW 5-15 KT. NW GUSTS 20-35 KT KBKE TO KONO IN THE
EVENING.
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
SHORT TERM...ST
LONG TERM....ST
AVIATION.....ST
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