975
FXUS65 KBOI 231559
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
959 AM MDT THU OCT 23 2025
DISCUSSION
A RIDGE OF HIGH PRESSURE WILL BRING ANOTHER DAY
OF MOSTLY SUNNY SKIES, MILD TEMPERATURES, AND LIGHT WINDS IN
MOST AREAS. EAST OF BOISE THROUGH THE MAGIC VALLEY WILL SEE WEST
TO NORTHWEST GUSTS 15-25 MPH, BUT ELSEWHERE WINDS WILL BE
LIGHTER. HIGH TEMPERATURES TODAY WILL BE SIMILAR TO A COUPLE
DEGREES WARMER THAN YESTERDAY, WHICH IS A FEW DEGREES ABOVE
NORMAL. A STORM SYSTEM IS STILL ON TRACK TO ARRIVE THIS WEEKEND,
BRINGING WIDESPREAD RAIN, MOUNTAIN SNOW, AND GUSTY WINDS. NO
UPDATES THIS MORNING.
AVIATION
VFR. PATCHY VALLEY FOG OVERNIGHT. SURFACE WINDS:
VARIABLE LESS THAN 10 KT, BECOMING NW 5-10KT THURSDAY AFTERNOON.
WINDS ALOFT AT 10KFT MSL: W-NW 5-15 KT.
KBOI...VFR. SURFACE WINDS: SE 5KT BECOMING NW 5-10KT THURSDAY
AFTERNOON.
WEEKEND OUTLOOK...NORTH PACIFIC COLD FRONT AND SUPPORTING UPPER
TROUGH WILL BRING WIDESPREAD RAIN AND SNOW LATE FRIDAY NIGHT THROUGH
SUNDAY NIGHT. SNOW LEVEL LOWERING TO 4000 FEET MSL NORTH TO 5000
FEET MSL SOUTH SUNDAY. AREAS OF MVFR OR LOWER FLIGHT CATEGORIES IN
CLOUDS AND PCPN. MOUNTAINS FREQUENTLY OBSCURED. SLIGHT CHANCE OF
THUNDERSTORMS NORTH OF KBOI SATURDAY EVENING. PATCHY FOG IN THE
VALLEYS.
PREV DISCUSSION
SHORT TERM...TODAY THROUGH SATURDAY NIGHT...MOSTLY CLEAR AND
GRADUALLY WARMER THROUGH FRIDAY BEFORE A COLD FRONT AND
SUPPORTING UPPER TROUGH COME IN FROM THE GULF OF ALASKA FRIDAY
NIGHT AND SATURDAY. A SHORT WAVE RIDGE WILL BUILD OFF THE WEST
COAST TODAY AHEAD OF THE APPROACHING UPPER TROUGH. THE RIDGE
WILL ACCOUNT FOR THE WARMING FRIDAY AS IT PASSES OVER OUR CWA.
CLOUDS WILL INCREASE IN OREGON FRIDAY AFTERNOON AND EVENING AS
THE COLD FRONT COMES CLOSER. WINDS WILL BECOME EAST OR SOUTHEAST
5 TO 15 MPH, AND LOW TEMPS FRIDAY NIGHT WILL BE ABOUT 10
DEGREES WARMER THAN THURSDAY NIGHT IN ALL AREAS. RAIN SHOWERS
WILL BEGIN IN OUR WESTERN-MOST OREGON ZONES FRIDAY EVENING,
AND IDAHO ZONES AROUND MIDNIGHT. BY SATURDAY MORNING ALL AREAS
EXCEPT TWIN FALLS COUNTY SHOULD BE WET. THE COLD FRONT WILL MOVE
EASTWARD ACROSS MOST OF OUR CWA DURING THE DAY SATURDAY, AND
SATURDAY WILL BE 8 TO 15 DEGREES COOLER THAN FRIDAY. THERE IS
A SLIGHT CHANCE OF THUNDERSTORMS NORTH OF BOISE SATURDAY
EVENING. TWIN FALLS COUNTY SHOULD FINALLY GET RAIN SATURDAY
EVENING. TOTAL PCPN FRIDAY NIGHT THROUGH SATURDAY NIGHT (I.E.,
ENDING 6 AM MDT SUNDAY MORNING) HAS BEEN LOWERED ABOUT 10 PERCENT
FROM WEDNESDAY EVENING'S UPDATE, BUT AMOUNTS WILL STILL BE
SIGNIFICANT: 0.75 TO 1.25 INCH IN THE BOISE MOUNTAINS AND WEST
CENTRAL IDAHO MOUNTAINS, 0.25 TO 0.75 INCH IN THE UPPER WEISER
RIVER VALLEY AND EASTERN BAKER COUNTY, AND GENERALLY 0.15 TO
0.25 INCH ELSEWHERE. SNOW LEVEL WILL BE GENERALLY ABOVE 6000
FEET MSL DURING MOST OF THE PCPN, WITH 2 TO 6 INCHES SNOW
ACCUMULATION IN THE IDAHO MOUNTAINS NORTH OF THE SNAKE BASIN,
MAINLY SATURDAY NIGHT. MCCALL/ID MAY GET AN INCH OF SNOW BY
SUNRISE SUNDAY.
LONG TERM...SUNDAY THROUGH THURSDAY...COLDER, SHOWERY WEATHER
WILL CONTINUE SUNDAY WITH SNOW LEVEL LOWERING TO 4000 FEET MSL
NORTH TO 5000 FEET MSL SOUTH. ADDITIONAL PCPN SUNDAY THROUGH 6
AM MDT MONDAY MORNING WILL BE AROUND .50 INCH IN THE BOISE
MOUNTAINS AND WEST CENTRAL IDAHO MOUNTAINS (FOR A STORM TOTAL
NEAR 1.50 INCH). SNOW WILL ACCUMULATE ANOTHER 4 TO 8 INCHES BUT
TOTAL STORM SNOWFALL LOOKS LESS THAN FORECAST YESTERDAY. THE
REST OF OUR CWA SHOULD HAVE .15 TO .25 INCH PCPN SUNDAY THROUGH
MONDAY MORNING. COOL, MOIST WESTERLY FLOW WILL CONTINUE THROUGH
MID-WEEK WITH AREAS OF MORNING FOG, THEN MILDER AND DRIER AS AN
UPPER RIDGE BUILDS OVER THE WESTERN STATES.
PRELIMINARY POINT TEMPS/POPS
BAKER CITY 31 64 41 55 / 0 0 50 90
BOISE 41 70 50 61 / 0 0 20 70
BURNS 27 68 37 55 / 0 0 60 90
CALDWELL 37 69 48 63 / 0 0 20 70
FAIRFIELD 25 63 35 53 / 0 0 10 70
IDAHO CITY 29 69 36 55 / 0 0 20 90
JEROME 36 65 44 59 / 0 0 0 20
MCCALL 28 60 34 44 / 0 0 70 100
MOUNTAIN HOME 35 69 47 62 / 0 0 10 40
ONTARIO 34 66 46 62 / 0 0 20 80
ROME 31 72 45 63 / 0 0 20 40
TWIN FALLS 37 65 47 61 / 0 0 0 20
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...ST
AVIATION.....CH
SHORT TERM...LC
LONG TERM....LC
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