510
FXUS65 KBOI 200021
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
621 PM MDT THU MAR 19 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- RECORD HIGH TEMPERATURES TODAY AND TOMORROW WITH DRY
CONDITIONS.
- BREEZY CONDITIONS AND LOW RELATIVE HUMIDITY WILL CREATE FIRE
DANGER CONCERNS FOR AREAS NEAR THE NV BORDER THIS AFTERNOON
AND FRIDAY AFTERNOON.
- A COLD FRONT ON SATURDAY WILL BRING COOLER TEMPERATURES,
MOUNTAIN PRECIPITATION, AND BREEZY WESTERLY WINDS FOR A FEW
DAYS BEFORE WARMING TREND.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 232 PM MDT THU MAR 19 2026
AN UNSEASONABLY STRONG UPPER LEVEL RIDGE WILL CONTINUE TO
IMPACT THE SOUTHWEST UNITED STATES OVER THE NEXT FEW DAYS.
BREEZY CONDITIONS AND LOW RELATIVE HUMIDITIES WILL BE OF
CONCERN IN HARNEY COUNTY FOR FIRE DANGER THIS AFTERNOON AND
FRIDAY AFTERNOON. RECORD HIGH TEMPERATURES EXPECTED ACROSS
SOUTHEAST OR AND SOUTHWEST ID TODAY AND FRIDAY. TEMPERATURES
WILL BE 20-25 DEGREES ABOVE NORMAL, WITH THE LOWEST VALLEYS
SEEING LOW TO MID 80S AND THE MOUNTAINS REACHING THE 60S THROUGH
FRIDAY. THE UPPER LEVEL RIDGE WILL BE SUPPRESSED ON SATURDAY AS
A COLD FRONT MOVES ACROSS THE AREA. TEMPERATURES WILL LOWER
AROUND 10-15 DEGREES ON SUNDAY. BREEZY WEST-NORTHWEST WINDS
SATURDAY AFTERNOON FOLLOWING THE FRONT.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 232 PM MDT THU MAR 19 2026
FOLLOWING THE COLD FRONTAL PASSAGE IN THE SHORT-TERM, DRY ZONAL
TO NORTHWEST FLOW WILL USHER IN COOLER TEMPERATURES COME SUNDAY
(ALTHOUGH LEANING ABOVE NORMAL). TEMPERATURES WILL TAKE ON A
WARMING TREND THROUGH TUESDAY, AS OUR AREA GETS INTO THE WARM
SECTOR OF AN APPROACHING GULF OF ALASKA LOW. COME TUESDAY,
TEMPERATURES WILL BE UP TO 15-20 DEGREES ABOVE NORMAL.
CONFIDENCE IS INCREASING ON THE EVOLUTION OF THE NEXT SYSTEM, AS
A SHORTWAVE AND ASSOCIATED COLD FRONT CROSS OVER OUR AREA
WEDNESDAY INTO THURSDAY. TEMPERATURES ON WEDNESDAY WILL DEPEND
ON THE EXACT TIMING OF THIS FRONT, THUS THERE IS STILL
UNCERTAINTY. A EARLIER FRONTAL PASSAGE WOULD DROP TEMPERATURES
CLOSER TO NORMAL, WHEREAS A LATER PASSAGE WOULD KEEP
TEMPERATURES ABOVE NORMAL A LITTLE LONGER. THE BEST CHANCE FOR
PRECIPITATION (30-60%) WITH THIS FRONT WILL COME WEDNESDAY OVER
THE TERRAIN IN OUR NORTHERN ZONES. GUSTY WINDS WILL ALSO
ACCOMPANY THE FRONTAL PASSAGE. SEASONABLE TEMPS AND DRY
CONDITIONS WILL FOLLOW THE COLD FRONT COME THURSDAY.
AVIATION /00Z FRIDAY THROUGH SATURDAY/
ISSUED 615 PM MDT THU MAR 19 2026
VFR WITH HIGH CLOUDS. SURFACE WINDS: VARIABLE UP TO 12 KT
THROUGH FRIDAY AM. THEN, SE-SW 5-15 KT FRIDAY PM, WITH GUSTS TO
20-25 KT WEST AND SOUTH OF SNAKE PLAIN. WINDS ALOFT AT 10 KFT
MSL: W-SW 15-30 KT.
KBOI...VFR. SURFACE WINDS: VARIABLE AROUND 5 KT, THEN SE 5-10
KT OVERNIGHT.
WEEKEND OUTLOOK...A COLD FRONT WILL BRING GUSTY WINDS AND
ISOLATED RAIN SHOWERS ON SATURDAY. LOCALIZED MVFR CONDITIONS IN
SHOWERS NEAR KMYL/KBKE. VFR SUNDAY. SURFACE WINDS: INCREASING
TO W-NW 10-20 KT WITH GUSTS TO 20-35 KT WITH COLD FRONT SATURDAY
PM. THEN, SW-NW 5-15 KT WITH AFTERNOON GUSTS 15-25 KT SUNDAY.
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.....SH
SHORT TERM...KA
LONG TERM....NF
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