862
FXUS65 KBOI 252048
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
248 PM MDT FRI APR 25 2025
SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT
THUNDERSTORMS
BEGAN SHORTLY AFTER NOON MDT IN SOUTHERN OWYHEE COUNTY.
HI-RES MODELS SHOW THEM INCREASING AND MOVING NORTH THROUGH
THE EVENING, THEN COLLECTING IN EASTERN OREGON OVERNIGHT.
NAMNEST, IN PARTICULAR, SHOWS A LINE OF STORMS AROUND 6 PM MDT
EXTENDING THROUGH ROME/OR-MOUNTAIN HOME-GLENNS FERRY-FAIRFIELD,
SHIFTING NORTH. THIS LINE IS FORECAST TO PASS THROUGH THE BOISE
METRO AROUND 7 PM MDT. EXPECT WIND GUSTS TO 50 MPH AND BRIEF
HEAVY RAIN. IN THE NAMNEST MODEL THE LINE IS NARROW AND SHOULD
PASS THROUGH ANY LOCATION IN LESS THAN ONE HOUR. PCPN SHOULD
CONTINUE THROUGH THE NIGHT IN EASTERN OREGON. QPF HAS INCREASED
TONIGHT COMPARED TO PREVIOUS MODEL RUNS, AND NEARLY ALL OF THEM
HAVE AT LEAST .10 INCH TONIGHT. AFTER A BREAK SATURDAY, SHOWERS
AND THUNDERSTORMS SHOULD INCREASE SUNDAY AS THE MAIN PACIFIC
UPPER TRACKS INLAND AND ACROSS NORTHERN NEVADA. AT THE SAME
TIME, AN UPPER THROUGH WILL BE TRACKING EASTWARD ALONG THE
CANADIAN BORDER, WITH THE NEVADA LOW AND THE NORTHERN TROUGH
ROUGHLY IN PHASE WITH EACH OTHER. SHOWERS AND THUNDERSTORMS
SHOULD BECOME MORE NUMEROUS SUNDAY IN OUR IDAHO ZONES AS THE
UPPER LOW AND TROUGH PASS BY. TOTAL QPF TONIGHT THROUGH SUNDAY
HAS INCREASED TO .50 TO 1.00 INCH NEAR THE NEVADA BORDER, AROUND
.50 INCH IN THE BOISE MOUNTAINS AND CAMAS PRAIRIE, .20 TO .30
INCH IN HARNEY AND MALHEUR COUNTIES, AROUND .25 INCH IN THE
SNAKE BASIN, AND LESS THAN.20 INCH IN OUR NORTHERN-MOST ZONES,
FARTHEST FROM THE NEVADA LOW. DAYTIME HIGH TEMPS THIS WEEKEND
WILL BE SLIGHTLY COOLER THAN TODAY'S HIGHS, WHILE NIGHTS WILL
BE MILD DUE TO EXTENSIVE CLOUD COVER. NORTHWEST WINDS WILL
INCREASE TO 15 TO 25 MPH SUNDAY IN EASTERN OREGON, GRADUALLY
WORKING INTO WESTERN IDAHO LATE SUNDAY.
LONG TERM...MONDAY THROUGH FRIDAY
THE BACK END OF THE CLOSED
LOW IS EXPECTED TO CONTINUE PUSHING EAST THROUGH THE EARLY HOURS
OF MONDAY AS A RIDGE BUILDS IN FROM THE NORTHWEST, BRINGING
WARMER AND DRIER CONDITIONS MONDAY. A WEAK SHORTWAVE TROUGH WILL
DIG ACROSS THE AREA TUESDAY, STEERING A NORTHWEST FLOW THAT
WILL COOL VALLEY DAYTIME TEMPERATURES INTO THE LOWER 60S.
PRECIPITATION CHANCES SIT AT 20-60% ON TUESDAY, WITH MOST
EXPECTED OVER HIGHER ELEVATIONS. A STRONG RIDGE WILL BUILD
IN ACROSS THE REGION FROM WEDNESDAY TO FRIDAY, RETURNING DRIER
AND WARMER THAN NORMAL CONDITIONS. VALLEY DAYTIME TEMPERATURES
ARE EXPECTED TO CLIMB INTO THE LOWER TO MID 70S WEDNESDAY TO
FRIDAY, WITH SNOW LEVELS GENERALLY IN THE 6000-7000 FT RANGE
BEFORE RISING TO AROUND 9000 FT ON FRIDAY.
AVIATION
VFR..SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS
IN THE AFTERNOON/EARLY EVENING OVER THE WEST-CENTRAL PLAINS
AND BOISE MTNS AND NEAR KMYL. BRIEF MVFR CONDITIONS IN
SHOWERS/THUNDERSTORMS. SURFACE WINDS: VARIABLE 5-15 KT, THEN
E-SE 5-15 KT THROUGH EVENING/OVERNIGHT. GUSTY THUNDERSTORM
OUTFLOWS UP TO 50 KT POSSIBLE LATE AFTERNOON/EARLY EVENING.
WINDS ALOFT AT 10KFT: E-SE 10-20 KT BECOMING S-SW 15-30 KT
TONIGHT.
KBOI...VFR. VARIABLE UNDER 5 THIS AFTERNOON BECOMING E-SE
LESS THAN 10 KT THIS EVENING. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS LATE AFTERNOON/EARLY EVENING, WITH STRONG OUTFLOW
GUSTS 40-50 KT AND BRIEF MVFR CONDITIONS.
WEEKEND OUTLOOK...MAINLY VFR. ACTIVE WEATHER THROUGH THE WEEKEND,
WITH SCATTERED SHOWERS AND ISOLATED AFTERNOON THUNDERSTORMS
THROUGHOUT THE AREA FRIDAY-SUNDAY. LOCAL MVFR, MOUNTAIN
OBSCURATION, AND GUSTY OUTFLOWS IN SHOWERS/ THUNDERSTORMS.
NORTHWEST WINDS INCREASING SUNDAY, WITH GUSTS UP TO 30 KT
SUNDAY AFTERNOON.
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
SHORT TERM...LC
LONG TERM....JY
AVIATION.....JY
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