061
FXUS65 KBOI 201647
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
947 AM MST THU FEB 20 2025
DISCUSSION
AREAS OF FOG, WHICH HAS BEEN LOCALLY DENSE (<= 1/4
MILE), WILL GRADUALLY IMPROVE AND DISSIPATE BY AROUND NOON.
THERE WAS ALSO SOME LIGHT SNOW EAST OF TWIN FALLS, BUT HAS
ENDED. OTHERWISE, EXPECT DRY CONDITIONS WITH MOSTLY CLEAR
SKIES ACROSS SE OREGON AND SW IDAHO. WINDY CONDITIONS PERSIST
IN SOUTH-CENTRAL IDAHO EAST OF BOISE THROUGH THE AFTERNOON. NO
UPDATES.
AVIATION
WIDESPREAD MVFR AND LOCAL IFR/LIFR CONDITIONS IN
FOG AND LOW STRATUS, IMPROVING AFTER THU/18Z. MOUNTAINS
OBSCURED. PATCHY VALLEY FOG AND LOW STRATUS REDEVELOPING LATE
TONIGHT. SURFACE WINDS: W-NW 5-15 KT, BECOMING VARIABLE LESS
THAN 8 KT OVERNIGHT. GUSTS TO 35 KT AT KTWF/KJER THROUGH THE
LATE AFTERNOON. WINDS ALOFT AT 10KFT MSL: W-NW 15-25 KT.
KBOI...MVFR IN FOG AND LOW CEILINGS THIS MORNING. IMPROVING
CONDITIONS AFTER THU/18Z WITH VFR AND FOG IN THE VICINITY OF THE
TERMINAL TONIGHT. SURFACE WINDS: W-NW 6-12 KT, BECOMING
VARIABLE AFTER FRI/02Z.
WEEKEND OUTLOOK... PRECIPITATION RETURNS LATE SATURDAY INTO
SUNDAY, WITH HIGH SNOW LEVELS FAVORING RAIN AT ALL TERMINALS,
EXCEPT FOR PERIODS OF A RAIN/SNOW MIX AT KMYL ON SATURDAY
EVENING. LOW CEILINGS AND REDUCED VISIBILITY IN PRECIPITATION,
ESPECIALLY LATE SATURDAY AND SUNDAY MORNING. MOUNTAINS OBSCURED
LATE SATURDAY-SUNDAY. SURFACE WINDS: SOUTHEAST WINDS 5-15 KT IN
THE SNAKE RIVER VALLEY ON SUNDAY, ELSEWHERE VARIABLE LESS THAN
10 KT.
PREV DISCUSSION
SHORT TERM...TODAY THROUGH SATURDAY NIGHT...AN AREA OF LIGHT
SNOW CONTINUES TO GRADUALLY SHIFT EASTWARD, REMAINING FOCUSED
OVER THE WESTERN MAGIC VALLEY AND BOISE MOUNTAINS. AREAS OF FOG
ARE ONCE AGAIN DEVELOPING ACROSS THE SNAKE PLAIN WITHIN THE
REMNANT LOW-LEVEL MOISTURE STILL IN PLACE. PRECIPITATION CHANCES
WILL BE NEAR ZERO BY MID-DAY TODAY AMIDST DIMINISHING CLOUD
COVER, AS TEMPORARY RIDGING BUILDS OVER THE REGION. TEMPERATURES
HOLD STEADY TODAY BEFORE A SLIGHT WARMING TREND FRIDAY AND
SATURDAY. A MORE ACTIVE REGIME AMIDST AN INFLUX OF PACIFIC
MOISTURE RETURNS SATURDAY MORNING INTO NEXT WEEK, BRINGING RAIN
AND SNOW (ABOVE ABOUT 4000 FEET) TO MAINLY EAST-CENTRAL OREGON
AND WEST-CENTRAL IDAHO DURING THE DAY SATURDAY. THERE IS MORE
UNCERTAINTY ABOUT THE OCCURRENCE OF PRECIPITATION FARTHER SOUTH
INTO SOUTHWEST IDAHO AND SOUTHEAST OREGON. MORE WIDESPREAD RAIN
AND SNOW CHANCES DEVELOP LATE SATURDAY ACROSS THE ENTIRE AREA
AMIDST RAPIDLY RISING SNOW LEVELS.
LONG TERM...SUNDAY THROUGH THURSDAY...MODEL GUIDANCE REMAINS
CONSISTENT IN SHOWING A PACIFIC FRONTAL SYSTEM MOVING INTO THE
AREA AND BRINGING WIDESPREAD PRECIPITATION THROUGH LATE NIGHT
SATURDAY AND THROUGHOUT SUNDAY. RAIN WILL BE EXPECTED ACROSS THE
LOWER VALLEYS. SNOW LEVELS INITIALLY WILL BE BETWEEN 4000-5000
FT AND RISE TO 6000-7000 FT BY SUNDAY AFTERNOON INTO EARLY NEXT
WEEK. THIS WILL FAVOR RAIN IN SOME MOUNTAIN AREAS THAT RECEIVED
SIGNIFICANT SNOWFALL RECENTLY, WHICH WILL INCREASE THE POTENTIAL
FOR SOME RISES IN AREA RIVERS EARLY NEXT WEEK. DAYTIME
TEMPERATURES ARE EXPECTED TO BE WARMER IN THE LOW TO MID 50S
FROM MONDAY TO MID-WEEK, WITH NIGHTTIME TEMPERATURES EXPECTED TO
REMAIN IN THE HIGH 30S TO LOW 40S. BRIEF HIGH PRESSURE WILL
BUILD IN THROUGH TUESDAY, BEFORE ANOTHER TROUGH MOVES IN ACROSS
THE PACIFIC NW WITH ANOTHER ROUND OF PRECIPITATION EXPECTED.
UPPER RIDGING WILL BUILD IN THE MIDDLE OF THE WEEK WITH DRIER
CONDITIONS RETURNING.
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...BW
AVIATION.....SA/NF
SHORT TERM...JR
LONG TERM....JY/JR
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