217
FXUS65 KPIH 221207
AFDPIH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
507 AM MST THU JAN 22 2026
KEY MESSAGES
- FOG AND LOW CLOUDS WILL CONTINUE TO AFFECT SOME AREAS THROUGH
THURSDAY, ESPECIALLY DURING THE OVERNIGHT AND MORNING
PERIODS, AMID A CONTINUED QUIET WEATHER PATTERN FOR THE
REGION.
- A PATTERN SHIFT IS EXPECTED BY FRIDAY INTO THE WEEKEND WITH A
TROUGH MOVING THROUGH, WHICH COULD CLEAR OUT THE DAILY FOG
AND STRATUS. HOWEVER, MODELS CONTINUE TO PUSH BACK ON PRECIP
CHANCES INTO NEXT WEEK.
- CONTINUED DRY INTO NEXT WEEK WITH A WARMING TREND LIKELY
SHORT TERM /THROUGH FRIDAY/
ISSUED AT 251 AM MST THU JAN 22 2026
HIGH PRESSURE WILL CONTINUE THROUGH THE PERIOD AND OUR AREA WILL
REMAIN IN NORTHWEST FLOW ALOFT. HOWEVER, HIGH PRESSURE WILL
WEAKEN AS OUR AREA IS IN BETWEEN TWO LOW PRESSURE SYSTEMS.
MODELS SHOW A TROUGH MOVING OVER OUR EASTERN AREAS LATE FRIDAY
INTO SATURDAY. MOST OF OUR AREA IS CLEAR CURRENTLY, THOUGH
STRATUS AND PATCHY DENSE FOG IS FORMING BACK IN ACROSS THE
EASTERN MAGIC VALLEY AND UP THE LOWER SNAKE PLAIN EARLY THIS
MORNING. EXPECT EROSION OF THIS STRATUS AGAIN DURING THE DAY
AGAIN. SOME STRATUS IS EXPECTED TO FORM AGAIN ON FRIDAY MORNING,
THOUGH OVERALL STRATUS WILL CONTINUE TO ERODE AND WILL LIKELY
BE GONE BY LATE SATURDAY. MID AND UPPER LEVEL CLOUDS ON FRIDAY
WILL LIKELY PREVENT ANY FOG DEVELOPMENT FRIDAY MORNING. HAVE
CONTINUED TO LOWER DAYTIME TEMPERATURES DUE TO STRATUS,
ESPECIALLY FOR THE EASTERN MAGIC VALLEY AND THE LOWER SNAKE
PLAIN.
LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/
ISSUED AT 117 PM MST WED JAN 21 2026
THE EXTENDED PORTION OF THE FORECAST REMAINS GENERALLY
UNEVENTFUL INTO EARLY NEXT WEEK WITH NO HIGH-IMNPACT WEATHER
SYSTEMS EXPECTED. A WEAK IMPULSE MOVING THROUGH THE UPPER FLOW
ALOFT COULD BRING A LOW CHANCE FOR SOME FLURRIES ACROSS THE
HIGHER TERRAIN OF THE EASTERN HIGHLANDS ON FRIDAY BUT THAT'S
ABOUT IT ON THE PRECIP FRONT. HIGH PRESSURE WILL REMAIN IN
CONTROL THROUGHOUT THE WEEKEND AND INTO EARLY NEXT WEEK. THIS
SHOULD RESULT IN A SLIGHT WARMING TREND INTO THE LATTER PART OF
THE WEEKEND AND EARLY NEXT WEEK WITH LOWER VALLEY TEMPS
RETURNING TO THE UPPER 30S AND LOWER 40S. THAT BEING SAID,
VALLEY INVERSIONS COULD RETURN, ONCE AGAIN, WHICH COULD WRECK
HAVOC ON THE TEMPERATURE FORECAST ONCE AGAIN. OVERALL THOUGH,
EXPECT QUIET WEATHER TO CONTINUE INTO THE LAST WEEK OF JANUARY.
AVIATION /12Z TAFS THROUGH 12Z FRIDAY/
ISSUED AT 500 AM MST THU JAN 22 2026
WITH CONTINUED HIGH PRESSURE, THERE IS SOME PATCHY FOG AND LOW
STRATUS THAT FILLED BACK IN THE EASTERN MAGIC VALLEY AND THE
SNAKE PLAIN IMPACTING BYI, PIH, AND IDA THIS MORNING. SOME FOG
IS POSSIBLE FOR DIJ AS WELL IN THE NEXT COUPLE OF HOURS. FOG AND
STRATUS WILL LIKELY END BY MID TO LATE MORNING FOR ALL SITES.
STRATUS COULD LINGER INTO EARLY AFTERNOON ESPECIALLY FOR BYI.
STRATUS COULD RETURN TOMORROW MORNING, ESPECIALLY FOR BYI AND
PIH. HOWEVER, NO FOG IS EXPECTED. THERE WILL BE A WEAK WAVE PASS
OVER OUR EASTERN AREAS, WHICH WILL BRING MID TO UPPER LEVEL
CLOUDS AND A SLIGHT INCREASE IN WINDS. MODELS SHOW WEAK
NORTHERLY FLOW, ESPECIALLY ALOFT, THAT WILL ERODE ANY STRATUS IN
THE SNAKE PLAIN AND EASTERN MAGIC VALLEY FRIDAY AND, ESPECIALLY,
BY SATURDAY.
AIR QUALITY
ISSUED AT 117 PM MST WED JAN 21 2026
WE HAVE EXTENDED THE AIR STAGNATION ADVISORY OUT THROUGH
THURSDAY FOR NOW. WE REALLY HAVEN'T SEEN ANY MOVEMENT OF POOR
AIR ACROSS THE POCATELLO AREA AS WELL AS ACROSS THE CACHE
VALLEY, EVEN WITH THE FLOW MORE NORTHERLY AND NO LONGER DIRECTLY
UNDER THE RIDGE. LOOKS LIKE THIS COULD IMPROVE DURING THE DAY ON
FRIDAY AND INTO THE WEEKEND THOUGH WITH A WEAK SYSTEM PUSHING
THROUGH THE REGION.
PIH WATCHES/WARNINGS/ADVISORIES
AIR STAGNATION ADVISORY UNTIL NOON MST TODAY FOR IDZ054-059.
SHORT TERM...TW
LONG TERM...MCKAUGHAN
AVIATION...TW
AIR QUALITY...KEYES
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