268
WWUS75 KMSO 172301
NPWMSO
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
501 PM MDT SUN MAY 17 2026
MTZ001-181400-
/O.EXB.KMSO.FR.Y.0003.260518T0600Z-260518T1400Z/
KOOTENAI/CABINET REGION-
501 PM MDT SUN MAY 17 2026
...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT
MONDAY...
* WHAT...TEMPERATURES BETWEEN 25 AND 34 DEGREES WILL RESULT IN FROST
FORMATION.
* WHERE...KOOTENAI/CABINET REGION.
* WHEN...FROM MIDNIGHT TONIGHT TO 8 AM MDT MONDAY.
* IMPACTS...FROST COULD HARM SENSITIVE OUTDOOR VEGETATION. SENSITIVE
OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED.
* ADDITIONAL DETAILS...TEMPERATURE RANGES INCLUDE: 31 TO 35 DEGREES
IN EUREKA, 25 TO 28 IN OLNEY, 32 TO 36 LIBBY AND TROY AREAS, 30 TO
35 SOUTH OF LIBBY TO HAPPYS INN AND 26 TO 31 MARION AND YAAK AREAS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE STEPS NOW TO PROTECT TENDER PLANTS FROM THE COLD.
MTZ004-181400-
/O.EXB.KMSO.FR.Y.0003.260518T0600Z-260518T1400Z/
LOWER CLARK FORK REGION-
501 PM MDT SUN MAY 17 2026
...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT
MONDAY...
* WHAT...TEMPERATURES BETWEEN 25 AND 34 DEGREES WILL RESULT IN FROST
FORMATION.
* WHERE...LOWER CLARK FORK REGION.
* WHEN...FROM MIDNIGHT TONIGHT TO 8 AM MDT MONDAY.
* IMPACTS...FROST COULD HARM SENSITIVE OUTDOOR VEGETATION. SENSITIVE
OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED.
* ADDITIONAL DETAILS...TEMPERATURE RANGES INCLUDE:28 TO 32 DEGREES IN
THOMPSON FALLS, 30 TO 34 DEGREES IN PLAINS, 33 TO 37 DEGREES IN
NOXON, 25 TO 28 DEGREES IN HAUGAN, 29 TO 32 DEGREES IN ST. REGIS,
AND 29 TO 34 DEGREES IN ALBERTON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE STEPS NOW TO PROTECT TENDER PLANTS FROM THE COLD.
MTZ003-005-181500-
/O.CON.KMSO.FR.Y.0003.260518T0200Z-260518T1500Z/
FLATHEAD/MISSION VALLEYS-MISSOULA/BITTERROOT VALLEYS-
501 PM MDT SUN MAY 17 2026
...FROST ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 9 AM
MDT MONDAY...
* WHAT...TEMPERATURES AS LOW AS 28 DEGREES WILL RESULT IN FROST
FORMATION.
* WHERE...FLATHEAD/MISSION VALLEYS AND MISSOULA/BITTERROOT VALLEYS.
* WHEN...FROM 8 PM THIS EVENING TO 9 AM MDT MONDAY.
* IMPACTS...FROST COULD HARM SENSITIVE OUTDOOR VEGETATION. SENSITIVE
OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED.
* ADDITIONAL DETAILS...LOW-LYING AREAS OF THE BITTERROOT VALLEY COULD
FALL BETWEEN 24 AND 28 DEGREES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE STEPS NOW TO PROTECT TENDER PLANTS FROM THE COLD.
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