943
WWUS75 KMSO 291923
NPWMSO
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
1123 AM PST MON DEC 29 2025
IDZ005>008-012000-
/O.NEW.KMSO.AS.Y.0002.251229T2000Z-260101T2000Z/
NORTHERN CLEARWATER MOUNTAINS-SOUTHERN CLEARWATER MOUNTAINS-
OROFINO/GRANGEVILLE REGION-LOWER HELLS CANYON/SALMON RIVER REGION-
1123 AM PST MON DEC 29 2025
..AIR STAGNATION ADVISORY IN EFFECT UNTIL NOON PST THURSDAY
* WHAT...STAGNATION CONDITIONS WILL TRAP POLLUTANTS, LEADING TO
DETERIORATING AIR QUALITY.
* WHERE...LOWER HELLS CANYON/SALMON RIVER REGION,
OROFINO/GRANGEVILLE REGION, SOUTHERN CLEARWATER MOUNTAINS, AND
NORTHERN CLEARWATER MOUNTAINS.
* WHEN...UNTIL NOON PST THURSDAY.
* IMPACTS...PERIODS OF AIR STAGNATION CAN LEAD TO THE BUILD UP OF
POLLUTANTS NEAR THE SURFACE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PERSONS WITH RESPIRATORY ILLNESS SHOULD FOLLOW THEIR PHYSICIANS
ADVICE FOR DEALING WITH HIGH LEVELS OF AIR POLLUTION DURING PERIODS
OF STAGNANT AIR.
ACCORDING TO STATE AIR QUALITY AGENCIES, PROLONGED PERIOD OF
STAGNANT AIR CAN HOLD POLLUTANTS CLOSE TO THE GROUND WHERE PEOPLE
LIVE AND BREATHE. CHECK WITH YOUR LOCAL BURN AGENCY FOR ANY CURRENT
RESTRICTIONS IN YOUR AREA.
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