943
FXUS65 KBOI 071700
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1000 AM MST SAT FEB 7 2026
DISCUSSION
FOG AND MIST ARE MIXING OUT IN THE LOWER TREASURE
VALLEY AS OF 10AM MST, BUT VISIBLE SATELLITE IMAGERY STILL SHOWS
STAGNANT AIR IN THE SNAKE RIVER VALLEY. THIS WILL HANG ON TODAY
AND TONIGHT, WITH ABOVE NORMAL TEMPERATURES AND DRY CONDITIONS
EXPECTED THANKS TO HIGH PRESSURE OVER THE REGION. TWIN FALLS IS
ALREADY UP TO 47F, ABOUT 10 DEGREES ABOVE NORMAL FOR THIS TIME
OF YEAR!
A SIGNIFICANT SHIFT IS STILL ON TRACK FOR TOMORROW, WITH A
SHORTWAVE TROUGH BRINGING BREEZY WINDS, VALLEY RAIN, MOUNTAIN
SNOW, AND COOLER TEMPERATURES. SNOW LEVELS INITIALLY WILL REMAIN
AROUND 6-7K FEET MSL THANKS TO THE EXTENDED PERIOD OF WARMING. HIGH
ELEVATION PEAKS AND MOUNTAIN PASSES ABOVE 7K FEET WILL SEE
MODERATE ACCUMULATION OF SNOW (4-8 INCHES) BY MONDAY MORNING. NO
UPDATES NECESSARY TO THE FORECAST.
AVIATION
VFR. WIDESPREAD MVFR/IFR IN ISOLATED SHOWERS MOVING
INTO SE OREGON AND CENTRAL IDAHO LATE SATURDAY INTO SUNDAY
MORNING, WITH SNOW LEVELS AT 6K-7K FEET MSL. SURFACE WINDS:
VARIABLE UP TO 10 KT TODAY EXCEPT W-SW 5-15 KT IN SE OREGON AND
NEAR ID-NV BORDER SATURDAY AFTERNOON. WINDS ALOFT AT 10KFT MSL:
W 10-20 KT.
KBOI...VFR. SURFACE WINDS: VARIABLE UP TO 6 KT, BECOMING SE
5-9 KT SATURDAY EVENING.
SUNDAY OUTLOOK...MVFR/IFR CONDITIONS THANKS TO A BAND OF
PRECIPITATION MOVING IN FROM NW TO SE BEGINNING SUN/12Z. SNOW
LEVELS 6K-7K FT MSL, THEN LOWERING TO 4.5K-5.5K FT MSL
OVERNIGHT. MTNS BECOMING OBSCURED. SURFACE WINDS: SW-SE 10-20
KT. AFTERNOON GUSTS TO 20-35 KT WITH STRONGEST GUSTS ON
RIDGETOPS AND IN SE OR.
AIR STAGNATION
LIGHT SURFACE WINDS AND LOW MIXING HEIGHTS
UNDERNEATH THE UPPER-LEVEL RIDGING WILL CONTINUE FOR THE SNAKE
PLAIN IN SOUTHWEST IDAHO/EAST-CENTRAL OREGON. INCREASING WIND
GUSTS AND PRECIPITATION CHANCES BEGIN SUNDAY AFTERNOON AHEAD OF
A COLD FRONT MOVING THROUGH THE AREA SUNDAY EVENING. THE VALLEY
INVERSION WILL BEGIN TO ERODE SUNDAY FROM THE COLD FRONT. AS A
RESULT, THE AIR STAGNATION ADVISORY FOR THE WESTERN SNAKE PLAIN
IS SET TO EXPIRE SUNDAY MORNING.
PREV DISCUSSION
SHORT TERM...TODAY THROUGH MONDAY NIGHT...SATURDAY TO REMAIN
DRY THROUGH THE AFTERNOON WITH AN UPPER-LEVEL SHORTWAVE
DISTURBANCE MOVING INTO THE AREA SATURDAY NIGHT INTO SUNDAY.
PRE-FRONTAL PRECIPITATION WILL BEGIN IN SE OREGON AND CENTRAL
IDAHO SATURDAY NIGHT INTO EARLY SUNDAY MORNING. CONFIDENCE IN
THE TREASURE VALLEY RAIN SHADOWING EFFECT IS HIGH DURING THIS
PERIOD, WITH 700 MB WINDS FORECAST TO BE FROM THE SW AT 30-40
KTS. SNOW LEVELS WILL BE QUITE HIGH AT THIS TIME DUE TO BEING IN
THE WARM SECTOR, AT APPROXIMATELY 6500-7500 FT MSL. SURFACE WINDS
WILL BEGIN TO RISE SUNDAY AFTERNOON (BEING SW-SE 15-20 MPH)
BEFORE THE COLD FRONT ASSOCIATED WITH THIS SYSTEM MOVES THROUGH
LATE SUNDAY. PEAK GUSTS 25-40 MPH ACROSS THE HIGHER TERRAIN. AS
UPPER-LEVEL FLOW TURNS MORE OUT OF THE NW CLOSER TO 12Z/MON, AND
THE COLD FRONT MAKES ITS WAY THROUGH, PRECIPITATION CHANCES
RISE FOR THE SNAKE PLAIN. THE BULK OF THE COLD AIR WILL NOT
ARRIVE UNTIL AFTER PRECIPITATION WANES EARLY MONDAY. SNOW
LEVELS WILL SLOWLY FALL BEHIND THE FRONT TO 3.5-4.5 KFT.
TEMPERATURES BEHIND THE FRONT WILL BE NEAR NORMAL FOR THIS TIME
OF YEAR.
LONG TERM...TUESDAY THROUGH SATURDAY...UNSETTLED CONDITIONS
CONTINUE WITH REPEATED UPPER-LEVEL TROUGHING AND CUT-OFF LOW
PRESSURE SYSTEMS ALOFT MOVING THROUGH THE PACIFIC NW AND GREAT
BASIN. CLUSTER ANALYSIS KEEPS THE WESTERN CONUS IN THIS PATTERN
THROUGH THE EXTENDED, WITH SOME BRIEF UPPER-LEVEL SHORTWAVE
RIDGING FRIDAY. PRECIPITATION CHANCES FOLLOW THESE DISTURBANCES,
PRIMARILY ON TUESDAY INTO WEDNESDAY AND STARTING AGAIN NEAR THE
WEEK'S END. THE AXES OF MOISTURE ARE HIGHLY VARIABLE ACROSS THE
CLUSTERS, WITH SOME ENSEMBLE GUIDANCE KEEPING IT SOUTH OF THE
AREA COMPARED TO OTHERS. CONFIDENCE REMAINS LOW ON TIMING,
COVERAGE, AND AMOUNT AS OF THIS FORECAST. REGARDLESS, TEMPERATURES
NEXT WEEK WILL BE HOVERING NEAR/SLIGHTLY ABOVE NORMAL.
BOI WATCHES/WARNINGS/ADVISORIES
ID...AIR STAGNATION ADVISORY UNTIL 10 AM MST SUNDAY
IDZ012-014-016-033.
OR...AIR STAGNATION ADVISORY UNTIL 10 AM MST /9 AM PST/ SUNDAY
ORZ064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
DISCUSSION...SA
AVIATION.....SA
AIR STAGNATION...CH
SHORT TERM...CH
LONG TERM....CH
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