452
WWUS75 KMSO 201625
NPWMSO
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
1025 AM MDT THU AUG 20 2026
IDZ007-008-211630-
/O.NEW.KMSO.HT.Y.0002.260821T1800Z-260822T0300Z/
OROFINO/GRANGEVILLE REGION-LOWER HELLS CANYON/SALMON RIVER REGION-
925 AM PDT THU AUG 20 2026
..HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM PDT FRIDAY
* WHAT...MODERATE TO MAJOR RISK OF HEAT EFFECTS EXPECTED.
* WHERE...LOWER HELLS CANYON/SALMON RIVER REGION AND OROFINO/LOWER
CLEARWATER REGION.
* WHEN...FROM 11 AM TO 8 PM PDT FRIDAY.
* IMPACTS...THIS LEVEL OF HEAT AFFECTS ANYONE WITHOUT EFFECTIVE
COOLING AND/OR ADEQUATE HYDRATION. IMPACTS LIKELY IN SOME HEALTH
SYSTEMS, HEAT-SENSITIVE INDUSTRIES AND INFRASTRUCTURE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
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