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FXUS65 KPIH 010931
AFDPIH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
231 AM MST SUN FEB 1 2026
KEY MESSAGES
- TEMPERATURES WILL WARM BY SEVERAL MORE DEGREES TODAY, WITH
MANY AFTERNOON HIGHS REACHING THE 40S AND LOWER 50S.
- AFTER A BRIEF RELATIVE COOLDOWN MONDAY AND TUESDAY, THE DRY
AND WARMING TREND RETURNS THROUGH THE END OF THE WEEK.
- INVERSIONS MAY BREAK PROVIDED THERE IS SUFFICIENT MIXING
MONDAY AND TUESDAY, BUT STAGNANT CONDITIONS WILL RETURN FOR THE
LATTER HALF OF THE WEEK.
SHORT TERM /THROUGH TONIGHT/
ISSUED AT 140 AM MST SUN FEB 1 2026
WEAK SHORTWAVE WILL SHIFT THROUGH EASTERN IDAHO LATER TODAY INTO
MONDAY. WHILE PRECIPITATION WILL REMAIN NORTH OF OUR CWA, MID- TO
HIGH-LEVEL CLOUDS WILL STICK AROUND AND WINDS WILL INCREASE A BIT
WITH THE BREEZIEST GUSTS TO AROUND 20 MPH FORECAST IN THE SOUTH
HILLS AND RAFT RIVER REGIONS. WE WILL STILL SEE OUR DAYTIME
TEMPERATURES WARM BY SEVERAL MORE DEGREES AS COMPARED TO YESTERDAY,
RISING INTO THE LOW TO MID-50S ACROSS THE EASTERN MAGIC VALLEY AND
VALLEYS SOUTH OF THE SNAKE RIVER PLAIN. WHILE PATCHY FOG REMAINS
POSSIBLE, LOWER LEVELS WILL CONTINUE TO TREND DRIER AND MID-AND HIGH-
LEVEL CLOUDS WILL ALSO LIMIT DEVELOPMENT.
LONG TERM /MONDAY THROUGH SATURDAY/
ISSUED AT 124 PM MST SAT JAN 31 2026
MONDAY LOOKS TO BE SLIGHTLY COOLER BEHIND SUNDAY NIGHT
SHORTWAVE FEATURE. SECOND SHORTWAVE REINFORCES THE NORTHWEST
FLOW FOR TUESDAY, BUT THIS FEATURE ALSO LOOKS TO REMAIN DRY.
BOTH DAYS SHOULD BE THE COOLEST OF THE WEEK AS THE RIDGE
REBOUNDS BY MIDWEEK. DRY CONDITIONS ARE FORECAST FOR THE
REMAINDER OF THE WEEK, WITH TREND TOWARD WARMER TEMPERATURES AND
RETURN TO OVERNIGHT SURFACE BASED INVERSIONS AS THE RIDGE AXIS
SLOWLY SHIFTS OVERHEAD THROUGH THE END OF THE WEEK.
AVIATION /06Z TAFS THROUGH 06Z MONDAY/
ISSUED AT 1033 PM MST SAT JAN 31 2026
NO BIG CHANGES FROM THE LAST FORECAST. HIGH PRESSURE RIDGING IS
FIRMLY OVER THE AREA. EXPECT VFR CONDITIONS AND OVERALL LIGHT
WINDS THROUGH THE PERIOD. THERE IS SOME MOISTURE MOVING THROUGH
THE HIGH PRESSURE RIDGE. CONTINUE TO HAVE MID-LEVEL CLOUDS IN
THE FORECAST FOR ALL TAF SITES. TOMORROW EVENING MODELS SHOW THE
HIGH PRESSURE RIDGE WEAKENING SLIGHTLY WITH A WEAK WAVE. MODELS
SHOW WINDS INCREASING SLIGHTLY TOMORROW EVENING FOR BYI AND
PIH.
AIR QUALITY
ISSUED AT 117 PM MST FRI JAN 30 2026
RIDGE OF HIGH PRESSURE REBUILDS FOR THE WEEKEND, STRENGTHENING
SURFACE BASED INVERSIONS AND INCREASING THE POTENTIAL FOR
POLLUTANT TRAPPING. A PAIR OF WEAK SHORTWAVES MAY BE ENOUGH TO
TEMPORARILY BREAK DOWN INVERSIONS MONDAY AND TUESDAY, BUT THE
RIDGE REDEVELOPS FOR THE LATTER HALF OF THE WEEK, AND STAGNANT
CONDITIONS ARE LIKELY TO RETURN.
PIH WATCHES/WARNINGS/ADVISORIES
AIR STAGNATION ADVISORY UNTIL NOON MST MONDAY FOR IDZ054-059.
SHORT TERM...CROPP
LONG TERM...DMH
AVIATION...TW
AIR QUALITY...DMH
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