393
FXUS65 KBOI 010340
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
840 PM MST SAT FEB 28 2026
DISCUSSION
LIGHT PRECIPITATION HAS MOVED INTO THE REGION
THIS EVENING IN ADVANCE OF A WEAKENING UPPER TROUGH.
THUNDERSTORMS HAVE STAYED SOUTH OF THE OR/NV BORDER, INITIATING
OVER NRN CA AND TRACKING WEST TO EAST. OVERNIGHT SHOWER
DEVELOPMENT WILL BE FOCUSED ACROSS SE OREGON AND FAR SW IDAHO
WHERE PRECIPITATION CHANCES REMAIN 30-50%. IT'S LOOKING MORE
LIKELY THAT AREAS FURTHER NORTH WILL REMAIN DRY THROUGH THE
NIGHT. WILL KEEP LOW END PRECIPITATION CHANCES (20-30%) TO
CAPTURE LIGHT RAIN/MTN SNOW POTENTIAL ACROSS THE SNAKE PLAIN AND
W-CENTRAL ID AND BOISE MTNS. PRECIPITATION TYPE IS MOSTLY RAIN
WITH SNOW LEVELS OF 6-8KFT MSL. NO UPDATE TO THE FORECAST FOR
TONIGHT.
AVIATION
GENERALLY VFR. LIGHT PRECIP AND VIRGA EXPANDING
NORTHWARD TONIGHT/SUNDAY. LOCAL MVFR-IFR DEVELOPING IN MTN SNOW
AND HEAVIER RAIN SHOWERS. SNOW LEVELS 6-8KFT MSL. MTNS
OBSCURED. A 10% CHANCE OF LIGHTNING NEAR OR-NV BORDER SUNDAY PM.
SURFACE WINDS: VARIABLE 5-15 KT, GUSTS UP TO 30 KT WITH
CONVECTION. WINDS ALOFT AT 10KFT MSL: W TO SW 10-20 KT.
KBOI...VFR. PERIODS OF LIGHT RAIN/VIRGA OVERNIGHT THROUGH SUNDAY.
THEN, RAIN AND MVFR CEILINGS LIKELY (>60% CHANCE) LATE SUN/EARLY
MON. SURFACE WINDS: VARIABLE AROUND 5 KT.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH MONDAY NIGHT...PACIFIC SYSTEM WILL
MOVE ENE-WARD ACROSS OUR SOUTHERN ZONES TONIGHT AND SUNDAY WITH
SCATTERED SHOWERS (20-40% COVERAGE), WEAKENING AS IT MOVES AWAY
FROM MAIN UPPER LOW NEAR 40/135. WE ALSO HAVE ISOLATED THUNDER-
STORMS (10% COVERAGE) NEAR THE NEVADA BORDER THIS EVENING.
SHOWERS WILL INCREASE IN THE SOUTHERN HALF OF OUR CWA SUNDAY
NIGHT AND MONDAY AS THE MAIN UPPER LOW COMES INLAND THROUGH
NORTHERN CALIFORNIA AND ACROSS NORTHERN NEVADA. SNOW LEVELS
WILL STAY ABOVE 7000 FEET MSL IN SOUTHERN AREAS (WHERE THE PCPN
IS). TEMPS WILL STAY MILD, MORE LIKE MID-APRIL THAN EARLY MARCH.
MONDAY WILL BE THE WARMEST DAY IN THE SHORT TERM WITH HIGHS 60
TO 65 IN THE TREASURE VALLEY AND SOUTHERN MALHEUR COUNTY. MONDAY
NIGHT WILL BE 8-14 DEGREES COOLER THAN THE PREVIOUS NIGHTS
UNDER CLEARING SKIES. WINDS WILL BE LIGHT AND VARIABLE THROUGH
MONDAY MORNING EXCEPT 20-30 MPH OUTFLOW GUSTS FROM STRONGER
SHOWERS. WINDS WILL BECOME WEST-NORTHWEST 10-15 MPH LATER MONDAY
BEHIND THE DEPARTING SYSTEM.
LONG TERM...TUESDAY THROUGH SATURDAY...TUESDAY WILL BE DRY AND
CLEAR WITH TEMPERATURES ABOUT 10 DEGREES ABOVE NORMAL. THE
UPPER LEVEL RIDGE RESPONSIBLE WILL QUICKLY MOVE EAST BY TUESDAY
NIGHT. CLOUDS INCREASE AHEAD OF AN APPROACHING TROUGH AND COLD
FRONT. THE FRONTAL PASSAGE REDUCES SNOW LEVELS TO 3500-4500 FT
MSL BY THURSDAY MORNING, WITH WIDESPREAD PRECIPITATION EXPECTED
LATE WEDNESDAY MORNING THROUGH THE EVENING. SCATTERED
PRECIPITATION CONTINUES WEDNESDAY NIGHT THROUGH THURSDAY AS THE
MOIST NORTHWESTERLY FLOW BEHIND THE FRONTAL REMAINS UNSETTLED.
BUILDING HIGH PRESSURE IN THE NORTH PACIFIC STEADILY DECREASES
PRECIPITATION CHANCES EACH DAY.
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
DISCUSSION...DG
AVIATION.....SH
SHORT TERM...LC
LONG TERM....JM
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