819
FXUS65 KBOI 170008
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
608 PM MDT THU APR 16 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- WIDESPREAD SUBFREEZING TEMPERATURES TONIGHT.
- DRIER AND WARMER CONDITIONS FRIDAY THROUGH SUNDAY. SUNDAY WILL
BE 5-10 DEGREES ABOVE NORMAL.
- NEXT CHANCE OF PRECIPITATION LATE TUESDAY THROUGH THURSDAY
FROM INCOMING PACIFIC LOW.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 225 PM MDT THU APR 16 2026
WEAK, SCATTERED SNOW/GRAUPEL SHOWERS WILL TAPER OFF BY TONIGHT.
SNOW LEVELS WILL STAY AT VALLEY FLOORS TONIGHT THROUGH FRIDAY
AFTERNOON. WINDS ARE EXPECTED TO WEAKEN TONIGHT, EXCEPT
ELEVATED GUSTS UP TO 30 MPH WILL CONTINUE OVER MAGIC VALLEY
THROUGH AROUND MIDNIGHT.
TEMPERATURES WILL DROP DOWN INTO THE MID TO UPPER 20S LATE
TONIGHT THROUGH FRIDAY MORNING. AS SUCH, A FREEZE WARNING IS IN
PLACE TONIGHT THROUGH FRIDAY MORNING. PATCHY FOG IS POSSIBLE IN
SHELTERED MOUNTAIN VALLEYS. OTHERWISE, FRIDAY WILL SEE SOME
BREEZY NORTHWEST WINDS AND MUCH DRIER CONDITIONS, AS A PACIFIC
HIGH PRESSURE STARTS BUILDING INTO THE REGION. FRIDAY NIGHT
THROUGH SATURDAY MORNING COULD SEE TEMPERATURES AT OR BELOW
FREEZING. SATURDAY WILL SEE CLEARER AND CALMER CONDITIONS WITH A
SLIGHT WARMING TREND TO NORMAL TEMPERATURES. SOME ELEVATED WIND
GUSTS ARE EXPECTED OVER EAST-CENTRAL OR AND UPPER TREASURE
VALLEY ID ON SATURDAY.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 225 PM MDT THU APR 16 2026
MILD AND DRY CONDITIONS WILL CARRY INTO EARLY NEXT WEEK AS A CLOSED
LOW DIGS OFF THE WEST COAST. SOUTHERLY FLOW WILL PUSH TEMPERATURES
TO 10-15 DEGREES ABOVE NORMAL FOR SUN-TUE, PLACING LOWER ELEVATIONS
IN THE MID-UPPER 70S AND MTN VALLEYS INTO THE MID 60S. THE FORECAST
FOR TUESDAY HAS TRENDED DRIER AND WARMER DUE TO SLOWER PROGRESSION
OF THE PACIFIC CLOSED LOW. GIVEN RECENT MODEL TRENDS WOULD EXPECT
FORECAST FOR TUESDAY TO CONTINUE LEANING DRIER ESPECIALLY ACROSS SW
IDAHO ZONES. MODEL CONSENSUS IS FOR THE UPPER LOW TO EJECT INLAND ON
WEDNESDAY, BRINGING A 40-50% CHANCE OF SHOWERS IN THE VALLEYS AND 60-
80% CHANCE IN THE MOUNTAINS. SNOW LEVELS ON WEDNESDAY WILL RANGE
BETWEEN 6-8KFT MSL. A 20-40% CHANCE OF SHOWERS LINGERS ON THURSDAY
AS MODELS SHOW THE LOW KICKING EASTWARD. TEMPERATURES WILL COOL DOWN
TO NEAR NORMAL FOR WED/THUR.
AVIATION /00Z FRIDAY THROUGH SATURDAY/
ISSUED 549 PM MDT THU APR 16 2026
SCATTERED SNOW SHOWERS PRODUCING BRIEF MVFR/IFR CONDITIONS AND
OBSCURING MOUNTAINS WILL DECREASE THROUGH SUNSET. LOCAL MTN
VALLEY FOG OVERNIGHT. VFR ON FRIDAY, WITH SCATTERED CUMULUS OVER
MTNS. SURFACE WINDS: W-NW 10-20 KT WITH GUSTS TO 20-30 KT
THROUGH SUNSET. WINDS BECOMING VARIABLE LESS THAN 10 KT
OVERNIGHT AND FRIDAY, EXCEPT SW-NW 10-20 KT IN THE MAGIC VALLEY.
WINDS ALOFT AT 10KFT MSL: NW 15-25 KT.
KBOI...VFR WITH SCATTERED TO BROKEN CUMULUS THROUGH SUNSET.
ISOLATED SNOW SHOWERS THROUGH EARLY EVENING WITH A 10% CHANCE
TO IMPACT THE TERMINAL. GUSTY NORTHWEST SURFACE WINDS WILL
WEAKEN BY 02Z, BECOMING LIGHT AND VARIABLE OVERNIGHT.
WEEKEND OUTLOOK...VFR. IT WILL BE DRY WITH PERIODS OF MID-HIGH
CLOUD COVER. LOCAL MTN VALLEY FOG SATURDAY MORNING. SURFACE
WINDS S-SE 5-15 KT SATURDAY INCREASING TO 10-20 KT WITH GUSTS
20-30 KT ON SUNDAY. STRONGEST WINDS ON SUNDAY IN THE SNAKE PLAIN
EAST OF KBOI. VARIABLE UP TO 15 KT OVERNIGHT SAT/SUN NIGHT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...FREEZE WARNING FROM MIDNIGHT TONIGHT TO 10 AM MDT FRIDAY FOR
IDZ012-014-016.
OR...FREEZE WARNING FROM MIDNIGHT MDT /11 PM PDT/ TONIGHT TO 10 AM
MDT /9 AM PDT/ FRIDAY FOR ORZ064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....ST
SHORT TERM...JY
LONG TERM....DG
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