504
FXUS65 KBOI 021155
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
555 AM MDT THU JUL 2 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- ISOLATED SHOWERS AND THUNDERSTORMS ARE EXPECTED THIS AFTERNOON
AND EVENING, AND AGAIN ON FRIDAY, NEAR THE IDAHO- NEVADA
BORDER.
- DRY THROUGH THE WEEKEND, WITH SLIGHT CHANCES OF THUNDERSTORMS
RETURNING EARLY NEXT WEEK.
- STEADY WARMING TREND INTO THE WEEKEND, WITH THE HOTTEST
TEMPERATURES EXPECTED SUNDAY THROUGH WEDNESDAY.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 335 AM MDT THU JUL 2 2026
BROAD TROUGHINESS IS IN PLACE OVER THE NORTHWEST THIS MORNING,
WITH A BAND OF MOISTURE ALOFT ORIENTED ACROSS SOUTH-CENTRAL
IDAHO PER WATER VAPOR IMAGERY. THIS AREA COINCIDENTALLY WILL BE
THE ONLY AREA TO SEE ISOLATED THUNDERSTORM DEVELOPMENT TODAY,
PRIMARILY ALONG THE IDAHO/NEVADA BORDER SOUTH OF I-84 THIS
AFTERNOON AND EVENING. THIS SCENARIO IS LIKELY TO REPEAT IN
NEARLY IDENTICAL FASHION AGAIN ON FRIDAY, AS LITTLE CHANGE TO
THE UPPER AIR PATTERN OCCURS. ELSEWHERE, GENERAL AIR MASS DRYING
HAS OCCURRED OVER THE PAST 24 HOURS, WITH PRECIPITABLE WATER
VALUES ROUGHLY AROUND 0.5 INCH, WHICH IS SLIGHTLY BELOW NORMAL
FOR THE DATE, KEEPING THE THUNDERSTORM THREAT SPATIALLY
CONFINED.
THE OTHER IMPACT WILL BE THE CONTINUED WARMING TREND AMIDST
MIDLEVEL HEIGHT RISES, WITH HIGH TEMPERATURES GENERALLY IN THE
80S TODAY IN THE LOWER ELEVATIONS, BUT RISING ANOTHER 10 DEGREES
BY SATURDAY. HUMIDITY VALUES WILL ALSO BOTTOM OUT IN THE 10-15
PERCENT RANGE IN MOST AREAS FRIDAY AND SATURDAY.
FOR THE 4TH OF JULY, ALL INDICATIONS ARE THAT THE PRECEDING
DRYING TREND WILL LEAD TO A QUIET HOLIDAY ACROSS THE ENTIRE
AREA, IN STARK CONTRAST TO LAST YEAR WHICH SAW MUCH MORE ACTIVE
WEATHER. HOWEVER, WITH THE BUILDING HEAT, HEATRISK LEVELS WILL
APPROACH MODERATE ACROSS MUCH OF THE I-84 CORRIDOR. PRECAUTIONS
SHOULD BE TAKEN FOR EXTENDED PERIODS OF OUTDOOR ACTIVITIES ON
SATURDAY, ESPECIALLY FOR THOSE SENSITIVE TO HEAT.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 335 AM MDT THU JUL 2 2026
THE EXTENDED PERIOD WILL MARK THE ONSET OF PERSISTENT WARM,
SUMMER-LIKE CONDITIONS, AS HEAT ACROSS THE EASTERN HALF OF THE
US FINALLY EXPANDS WESTWARD INTO THE INTERMOUNTAIN WEST. WHILE
TEMPERATURES WILL BE 5-10 DEGREES ABOVE NORMAL, MORE EXTREME
HEAT WILL BE MITIGATED BY PERSISTENT SOUTHWESTERLY FLOW ALOFT
ALONG THE PACIFIC COAST, WHICH WILL KEEP THE BUILDING UPPER
RIDGE SOMEWHAT SUPPRESSED TO THE SOUTH. NEVERTHELESS, HIGH
TEMPERATURES IN THE MID-UPPER 90S ARE LIKELY SUNDAY THROUGH
TUESDAY, CONTINUING WIDESPREAD MODERATE HEATRISK IMPACTS EACH
DAY.
MONSOONAL MOISTURE WILL ALSO ADVECT NORTHWARD EARLY NEXT WEEK AND
BRING A RETURN OF A SLIGHT CHANCE OF THUNDERSTORMS MONDAY
THROUGH WEDNESDAY. AN UPTICK IN AFTERNOON BREEZINESS WILL ALSO
OCCUR EARLY NEXT WEEK, ESPECIALLY ACROSS SOUTHERN IDAHO.
AVIATION /12Z THURSDAY THROUGH FRIDAY/
ISSUED 551 AM MDT THU JUL 2 2026
VFR. ISOLATED SHOWERS/THUNDERSTORMS RETURNING ALONG THE ID/NV
BORDER NEAR KTWF THURSDAY AFTERNOON. SURFACE WINDS: W-NW 5-10
KT. BECOMING LIGHT AND VARIABLE OVERNIGHT. WINDS ALOFT AT 10KFT
MSL: W-SW 10-20 KT.
KBOI...VFR WITH MOSTLY CLEAR SKIES. SURFACE WINDS: NW 6-11 KT.
LIGHT AND VARIABLE OVERNIGHT.
WEEKEND OUTLOOK...VFR WITH DRY CONDITIONS AND INTERMITTENT
CLOUDS.
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.....JR
SHORT TERM...JR
LONG TERM....JR
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