610
FXUS65 KBOI 210403
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
903 PM MST FRI FEB 20 2026
DISCUSSION
THE MAIN UPPER LEVEL TROUGH IS CURRENTLY EXITING
TO THE EAST, LEAVING THE REGION UNDER A COOLER AIR MASS FOR ONE
FINAL NIGHT. SKIES HAVE REMAINED MOSTLY CLEAR THIS EVENING;
HOWEVER, INCREASING HIGH CLOUDS LATER TONIGHT SHOULD HELP KEEP
TEMPERATURES SLIGHTLY WARMER THAN LAST NIGHT ACROSS THE LOWER
VALLEYS OF SOUTHEAST OREGON AND SOUTHWEST IDAHO. FOR SATURDAY, A
BROAD PACIFIC UPPER RIDGE WILL BEGIN TO SHIFT INLAND. THIS WILL
INITIATE A WARMING TREND WITH TEMPERATURES RISING 5 TO 10
DEGREES ABOVE TODAY'S MARKS. WARMING CONTINUES INTO SUNDAY AS WE
ENTER THE WARM SECTOR OF THE APPROACHING SYSTEM. TEMPERATURES
ON SUNDAY WILL JUMP ANOTHER 5 TO 10 DEGREES, REACHING WELL ABOVE
SEASONAL NORMALS. SOUTHEAST WINDS WILL ALSO BEGIN TO PICK UP,
PARTICULARLY ACROSS THE SNAKE RIVER PLAIN AND THE HIGHER TERRAIN
OF SOUTHEAST OREGON, WHERE GUSTS OF 20 TO 30 MPH ARE POSSIBLE
BY SUNDAY AFTERNOON. NO UPDATES NEEDED AT THIS TIME.
AVIATION
VFR WITH INCREASING HIGH-LEVEL CLOUDS. FOG IN MOUNTAIN
VALLEYS POSSIBLE SATURDAY MORNING. SURFACE WINDS: VARIABLE UNDER 10
KTS OVERNIGHT, BECOMING E-SE 7-12 KT SATURDAY AFTERNOON WITH GUSTS
20-25 KT IN THE LOWER SNAKE PLAIN AND NEAR KBKE. WINDS ALOFT AT
10KFT MSL: W-SW 10-20 KT.
KBOI...VFR. SURFACE WINDS: E-SE 6-12 KT WITH GUSTS TO 20-25 KT
BEGINNING LATE MORNING/EARLY AFTERNOON.
SUNDAY OUTLOOK...MOSTLY VFR. LOCAL IFR FOG IN MTN VALLEYS SUNDAY
MORNING. SURFACE WINDS: SE 5-15 KT WITH GUSTS UP TO 20 KT,
EXCEPT IN HIGHLANDS AND THE SNAKE PLAIN WHERE GUSTS UP TO 30 KT
ARE POSSIBLE.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT...ONE MORE COLD NIGHT AS
THE MAIN UPPER TROUGH EXITS EAST, THEN 5-10 DEGREES WARMER SATURDAY
AND ANOTHER 5 TO 10 DEGREES SUNDAY AS A BROAD PACIFIC UPPER RIDGE
COMES INLAND AND REPLACES THE TROUGH. WARM-FRONTAL CLOUDS WILL MAKE
SATURDAY NIGHT WARMER THAN TONIGHT ALONG WITH A SLIGHT CHANCE OF
RAIN AND SNOW IN THE NORTHERN-MOST MOUNTAINS, THEN DECREASING
CLOUDS IN THE WARM SECTOR WILL MAKE SUNDAY WARMER THAN SATURDAY.
IN ADDITION, DEEP SURFACE LOW PRESSURE OFF THE COAST WILL PRODUCE
GUSTY SOUTH OR EAST WINDS 15 TO 30 MPH IN OUR CWA SATURDAY THROUGH
SUNDAY, EVEN PERSISTING THROUGH THE NIGHTTIME HOURS.
LONG TERM...MONDAY THROUGH FRIDAY...WARMING CONTINUES WITH STRONG
SOUTHWESTERLY FLOW ALOFT AS A DEEP LOW APPROACHES. TEMPS ON MONDAY
REACH AROUND 10 DEGREES ABOVE NORMAL WITH GUSTY WINDS AHEAD OF THE
PRECIPITATION COMING THAT NIGHT. PRECIP CHANCES RISE TO 50- 90%
MONDAY EVENING THROUGH TUESDAY AS A STRONG MOISTURE CORE PASSES
OVER THE AREA. CHANCES ARE HIGHER OVER HIGHER TERRAIN, BUT THE
WARM TEMPS WILL KEEP SNOW LEVELS ELEVATED AT ABOUT 6 KFT MSL.
MODERATE PRECIPITATION TOTALS ARE LIKELY, WITH HEAVIER AMOUNTS
IN THE MOUNTAINS FAVORED BY STRONG FLOW ALOFT. TEMPERATURES ON
TUESDAY WILL COOL BY SEVERAL DEGREES. SNOW LEVELS DROP BEHIND
THE SYSTEM ON WEDNESDAY MORNING TO 3-5 KFT MSL, THOUGH MUCH
DRIER AIR WILL END THE PERIOD OF WIDESPREAD PRECIPITATION.
LINGERING SHOWERS ON WEDNESDAY WILL CLEAR OUT BY THURSDAY AS
THE MOISTURE MOVES NORTH OF THE AREA. A SLIGHT CHANCE OF
PRECIPITATION REMAINS THROUGH THE REST OF THE WEEK, THOUGH MOST
DETERMINISTIC RUNS SHOWS THE MOISTURE STAYING NORTH OF THE
FORECAST AREA. GUSTY WINDS CONTINUE EACH 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
DISCUSSION...JDS
AVIATION.....CH
SHORT TERM...LC
LONG TERM....JM
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