470
FXUS65 KBOI 041815
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1215 PM MDT SAT JUL 4 2026
UPDATE
UPDATED AVIATION DISCUSSION.
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/
ISSUED 335 AM MDT SAT JUL 4 2026
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/
ISSUED 335 AM MDT SAT JUL 4 2026
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 /18Z SATURDAY THROUGH SUNDAY/
ISSUED 1211 PM MDT SAT JUL 4 2026
VFR. 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 15-25 KT KBKE TO KONO THIS
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, BECOMING VARIABLE LESS THAN 10 KT
OVERNIGHT.
SUNDAY OUTLOOK...MAINLY VFR. ISOLATED THUNDERSTORMS OVER
SE OREGON, FAR SW IDAHO, AND THE CENTRAL IDAHO MOUNTAINS LATE
AFTERNOON AND EVENING. HIGH DENSITY ALTITUDE IN THE AFTERNOON
AND EVENING DUE TO HEAT. GUSTY OUTFLOW WINDS FROM SHOWERS AND
THUNDERSTORMS UP TO 50 KT. SURFACE WINDS: W-NW 5-15 KT. NW
GUSTS 20-30 KT KBKE TO KONO AND NEAR KMUO 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
AVIATION.....KA
SHORT TERM...ST
LONG TERM....ST
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