158
FXUS65 KBOI 180600
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1200 AM MDT SAT JUL 18 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- SHOWERS/THUNDERSTORMS ACROSS SOUTH-CENTRAL IDAHO AND THE
CENTRAL IDAHO MOUNTAINS THROUGH LATE EVENING. STORMS WILL BE
CAPABLE OF HEAVY RAINFALL, GUSTY OUTFLOW WINDS AND SMALL HAIL.
- DRIER THIS WEEKEND WITH AREAS OF SMOKE ACROSS SOUTHEAST
OREGON, EXPANDING INTO SOUTHWEST IDAHO THIS WEEKEND AND INTO
NEXT WEEK.
- HOT TEMPERATURES THROUGH NEXT WEEK, WITH VALLEY HIGHS IN THE
UPPER 90S TO AROUND 100 DEGREES.
- SHOWERS/THUNDERSTORMS INCREASE NEXT WEEK WITH HEAVY RAINFALL
POSSIBLE.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 306 PM MDT FRI JUL 17 2026
THUNDERSTORMS OVER W-CENTRAL IDAHO THIS EVENING WILL DISSIPATE
BY SUNSET. THE STORMS WILL BRING HEAVY RAIN, WITH GUSTY WINDS
AND SMALL HAIL POSSIBLE. WITH DEW POINTS 50S TO LOW 60S GUSTY
WINDS HAVE BEEN HARDER TO COME BY FROM THUNDERSTORMS. THE
WEEKEND WILL SEE DRIER CONDITIONS DEVELOP AS THE DEEPER MOISTURE
SHIFTS EAST OF THE REGION. OUTSIDE OF ISOLATED HIGH TERRAIN
THUNDERSTORMS IN W-CENTRAL IDAHO, THE AREA WILL DRY OUT THROUGH
SUNDAY. OTHERWISE IT WILL REMAIN HOT AND WE'LL SEE A INCREASE IN
SMOKE COVERAGE DUE TO WESTERLY SURFACE WINDS.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 306 PM MDT FRI JUL 17 2026
AFTER THE DRIER WEEKEND, ANOTHER SURGE OF MONSOON MOISTURE WILL
ARRIVE EARLY NEXT WEEK ACROSS SOUTHEAST OREGON AND SOUTHWEST
IDAHO. THIS WILL BRING A RETURN OF AIR MASS DRIVEN THUNDERSTORM
DEVELOPMENT. OUTSIDE OF EMBEDDED WAVES, CONVECTION WILL
INITIATE OVER HIGHER TERRAIN DURING THE AFTERNOON, DISSIPATING
WITH SUNSET. THE POTENTIAL FOR HEAVY RAIN AND FLOODING WILL
INCREASE AS PRECIPITABLE WATER AMOUNTS REACH 1.25 INCHES AND
SOUTHERN STEERING FLOW ALOFT WEAKENS TOWARDS MID-WEEK. LOWER
ELEVATION TEMPERATURES REMAIN IN THE UPPER 90S TO NEAR 100
THROUGH THE WEEK. SMOKE WILL LIKELY CONTINUE TO IMPACT MUCH OF
THE AREA THROUGH NEXT WEEK, ESPECIALLY ACROSS SE OREGON.
AVIATION /06Z SATURDAY THROUGH SUNDAY/
ISSUED 1157 PM MDT FRI JUL 17 2026
VFR, SCATTERED CLOUDS AND HAZE FROM WILDFIRE SMOKE OVERNIGHT. DENSE
SMOKE AND MVFR POSSIBLE IN SE OR NEAR KBNO AND KBKE. ISOLATED SHOWER
AND STORM DEVELOPMENT OVER CENTRAL AND S-CENTRAL ID SATURDAY
AFTERNOON WITH GUSTY WINDS AND LOCALLY HEAVY RAINFALL. HIGH
DENSITY ALTITUDE DUE TO HEAT IN THE AFTERNOON. SURFACE WINDS:
NW OR VARIABLE 5-12 KT. WINDS ALOFT AT 10KFT MSL: S-SW 5-15 KT.
KBOI...VFR WITH SOME HAZE DUE TO WILDFIRE SMOKE. HIGH DENSITY
ALTITUDE DUE TO HEAT IN THE AFTERNOON. SURFACE WINDS SE 5-10 KT
TONIGHT BECOME NW WITH GUSTS UP TO 20 KT TOMORROW.
SUNDAY OUTLOOK...HIGH DENSITY ALTITUDE DUE TO HEAT. AREAS OF SMOKE
REDUCING VISIBILITY MOSTLY ACROSS SE OREGON AND NEAR THE OR/ID
BORDER IN SW IDAHO. SURFACE WINDS: SW-NW 5-15 KT, AFTERNOON GUSTS 15-
25 KT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...AIR QUALITY ALERT UNTIL NOON PDT MONDAY FOR ORZ061-062.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....JM
SHORT TERM...DG
LONG TERM....DG
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