790
FXUS65 KBOI 130906
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
306 AM MDT MON APR 13 2026
KEY MESSAGES
- WIDESPREAD VALLEY RAIN AND MOUNTAIN SNOW ABOVE 4500 FEET ON
MONDAY.
- MUCH COOLER TEMPERATURES WITH RAIN AND SNOW SHOWERS WEDNESDAY
THROUGH FRIDAY.
- SNOW LEVELS WILL DROP TO NEAR VALLEY FLOORS THURSDAY MORNING,
WITH WIDESPREAD LOWER ELEVATION LIGHT SNOW LIKELY.
SHORT TERM /THROUGH WEDNESDAY NIGHT/
WRAPAROUND MOISTURE IS FILLING IN ACROSS THE REGION, WITH RAIN
BELOW ABOUT 5500 FEET. NEARLY 1 INCH OF RAIN FELL ON SUNDAY
ACROSS THE REGION, WITH MANY LOCATIONS OVERACHIEVING
SIGNIFICANTLY ON PRECIPITATION AMOUNTS. AS AIR CONTINUES TO COOL
OVERNIGHT, SNOW LEVELS WILL DROP TO 4500 FEET BY THE EARLY
MORNING, WITH ABOUT 1-3 INCHES OF SNOW EXPECTED NEAR MCCALL, ID
AND IDAHO CITY, ID. THIS SNOW WILL LIKELY MELT QUICKLY, AS
HIGHS ACROSS THE MOUNTAIN VALLEYS INCREASE TO THE MID 40S BY
LATE MORNING. VALLEY RAIN AND MOUNTAIN SNOW WILL CONTINUE
GENERALLY NORTH OF MOUNTAIN HOME, ID OVERNIGHT INTO MID
MORNING, WITH BREEZY SOUTHWESTERLY WINDS ACCOMPANYING THE
PRECIPITATION. THE WRAPAROUND MOISTURE AND LOW CENTER WILL MOVE
EAST BY MONDAY AFTERNOON, WITH PRECIPITATION GENERALLY TAPERING
OFF BY EARLY AFTERNOON. GRAUPEL SHOWERS AND A STRAY THUNDERSTORM
WILL FORM OVER OVER SOUTHEAST OREGON BY EARLY AFTERNOON, MOVING
INTO SOUTHWEST IDAHO AND LESSENING IN COVERAGE BY EARLY
EVENING. CLEARING MONDAY NIGHT INTO TUESDAY MORNING WILL ALLOW
FOR FOG FORMATION ACROSS AREA VALLEYS, ESPECIALLY IN HIGHER
TERRAIN.
DRY CONDITIONS WILL CONTINUE ON TUESDAY AS COOL NORTHWESTERLY
FLOW ALOFT MOVES IN. A VERY COLD LOW PRESSURE SYSTEM WILL THEN
MOVE INTO THE PACIFIC NORTHWEST ON WEDNESDAY, BRINGING A ROBUST
COLD FRONT TO THE REGION ON WEDNESDAY EVENING. GUSTY WINDS,
ISOLATED THUNDERSTORMS, AND ANOTHER PUSH OF WIDESPREAD
PRECIPITATION WILL ACCOMPANY THIS FRONTAL PASSAGE. TEMPERATURES
WILL DROP TO BELOW FREEZING BY WEDNESDAY NIGHT, WITH MOST
HIGHER ELEVATION LOCATIONS CHANGING FROM RAIN TO SNOW BY EARLY
EVENING.
LONG TERM /THURSDAY THROUGH MONDAY/
A COLD FRONT WILL CONTINUE TO EXIT OUR AREA THROUGH FRIDAY,
USHERING IN A COLDER AIR MASS AND GUSTY WEST/NORTHWEST WINDS.
WHILE WIDESPREAD PRECIPITATION WILL TAPER OFF, COLDER AIR ALOFT
WILL ALLOW FOR SCATTERED SHOWERS TO DEVELOP ACROSS THE AREA.
DEPENDING ON THE EXACT LOW TRACK, THE WEST CENTRAL MOUNTAINS
COULD SEE PERSISTENT ADDITIONAL PRECIPITATION ON THURSDAY WITH
THE DEFORMATION ZONE OF THE LOW OVERHEAD. SNOW LEVELS WILL DROP
TO VALLEY FLOORS ON THURSDAY BEHIND THIS FRONT. LOW SNOW LEVELS,
COMBINED WITH DIURNAL INSTABILITY, WILL SUPPORT SNOW/WINTRY MIX
AND GRAUPEL SHOWERS AREA-WIDE. ADDITIONAL SNOWFALL AMOUNTS OF
UP TO 4 INCHES ARE EXPECTED ABOVE 4500 FT MSL THURSDAY.
SOUTHERN PORTIONS OF THE WESTERN MAGIC VALLEY HAVE A 40-50%
CHANCE OF SEEING AT LEAST A HALF INCH OF SNOWFALL. ELSEWHERE,
LITTLE TO NO ACCUMULATIONS ARE EXPECTED. WINDS THURSDAY
AFTERNOON WILL GUST TO 25-45 MPH, WITH THE STRONGEST GUSTS IN
THE TYPICAL AREAS EAST OF MOUNTAIN HOME AND IN THE CAMAS
PRAIRIE. TEMPERATURES THURSDAY MORNING WILL BE NEAR FREEZING
THROUGHOUT THE SNAKE PLAIN, WITH WIDESPREAD TEMPERATURES AT OR
BELOW FREEZING COME FRIDAY MORNING. FOR THOSE WHO STARTED THEIR
GARDEN EARLY, IT MAY BE GOOD TO CONSIDER COVERING UP PLANTS OR
BRINGING THEM INSIDE.
PRECIPITATION CHANCES AND WINDS WILL TAPER OFF FRIDAY, AS THE SYSTEM
EXITS OUR AREA TO THE EAST. THIS WILL ALSO MARK THE START OF A
WARMING TREND, WITH TEMPERATURES BACK UP TO NEAR NORMAL BY SATURDAY
AS A RIDGE BEGINS TO BUILD IN. BY SUNDAY, TEMPERATURES WILL WARM TO
5-10 DEGREES ABOVE NORMAL. CONFIDENCE IS INCREASING ON ANOTHER
SYSTEM DIGGING DOWN FROM THE GULF OF ALASKA EARLY NEXT WEEK. WHILE
EXACT TIMING IS UNCERTAIN, THIS WILL LEAD TO INCREASING
PRECIPITATION CHANCES SUNDAY AFTERNOON, REMAINING ELEVATED (30-60%)
THROUGH MONDAY.
AVIATION /06Z MONDAY THROUGH TUESDAY/
ISSUED 1123 PM MDT SUN APR 12 2026
NUMEROUS SHOWERS PRODUCING LOW VFR TO IFR CONDITIONS, BECOMING
SCATTERED LATE MON AFTERNOON. PERIODS OF LIFR IN MTN SNOW. SNOW
LEVELS: 4500-5000 FT MSL THROUGH THE AM, THEN 5500-6000 FT MONDAY
PM. MTNS OBSCURED. SURFACE WINDS: S-W 5-15 KT, THEN NW-W 5-15 KT
WITH 20-25 KT GUSTS MONDAY PM. WINDS ALOFT AT 10KFT MSL: W TO NW 15-
30 KT.
KBOI...RAIN RETURNING AROUND MON/07Z, PRODUCING LOW VFR-MVFR
CONDITIONS. RAIN RATES MODERATE/HEAVY AT TIMES. SHOWERS BECOMING
SCATTERED LATE MON AFTERNOON. SLIGHT CHANCE OF FOG/LOW STRATUS MON
NIGHT/TUE AM. SURFACE WINDS: VARIABLE OR SE 5-10 KT, TRANSITIONING
TO SW-NW 5-15 KT MID MONDAY MORNING.
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...SA
LONG TERM....NF
AVIATION.....SH
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