Frost Advisory
URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
146 AM PDT Mon May 18 2026
CAZ104-106-108-116-117-181500-
/O.NEW.KEKA.FR.Y.0018.260518T1000Z-260518T1500Z/
Southwestern Humboldt-Southeastern Interior Humboldt-Southern
Trinity-Northwestern and Central Trinity-Northeastern Trinity-
Including Dinsmore, Shelter Cove, Garberville, Kneeland, Peanut,
Hyampom, Weaverville, Hayfork, Shively, Zenia, Junction City,
Alderpoint, Del Loma, Big Bar, Helena, Trinity Center, Bridgeville,
Ettersburg, Benbow, Douglas City, Bull Creek, Honeydew, Pepperwood,
Ruth, Forest Glen, Carrville, Briceland, Petrolia, and Whitethorn
146 AM PDT Mon May 18 2026
...FROST ADVISORY IN EFFECT UNTIL 8 AM PDT THIS MORNING...
* WHAT...Temperatures as low as 33 will result in frost formation.
* WHERE...Trinity County, and Southern Humboldt.
* WHEN...Until 8 AM PDT this morning.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
* ADDITIONAL DETAILS...Protected valleys may see local areas of frost
for several hours this morning.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
For hazard areas see https://www.weather.gov/wrh/hazards/?wfo=eka
MKK
URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
920 PM MDT Sun May 17 2026
IDZ053-055-181200-
/O.CON.KPIH.FR.Y.0005.260518T0900Z-260518T1500Z/
Upper Snake River Plain-Eastern Magic Valley-
Including the cities of Rexburg, Rupert, Heyburn, St. Anthony,
Oakley, Idaho Falls, and Burley
920 PM MDT Sun May 17 2026
...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY...
* WHAT...Temperatures 32 to 36 will result in frost formation. Areas
along the interstates from Burley to Pocatello to Idaho Falls may
remain warmer than 36 tonight.
* WHERE...Eastern Magic Valley and Upper Snake River Plain.
* WHEN...From 3 AM to 9 AM MDT Monday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
Visit weather.gov/pocatello for more information.
Wyatt
URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
920 PM MDT Sun May 17 2026
IDZ054-181200-
/O.NEW.KPIH.LW.Y.0006.260518T1200Z-260519T0300Z/
/O.CON.KPIH.FR.Y.0005.260518T0900Z-260518T1500Z/
Lower Snake River Plain-
Including the cities of American Falls, Shelley, Fort Hall,
Pocatello, and Blackfoot
920 PM MDT Sun May 17 2026
...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY...
...LAKE WIND ADVISORY IN EFFECT FROM 6 AM TO 9 PM MDT MONDAY FOR
AMERICAN FALLS RESERVOIR...
* WHAT...For the Frost Advisory, temperatures 32 to 36 will result
in frost formation. Areas along the interstates from Burley to
Pocatello to Idaho Falls may remain warmer than 36.
For the Lake Wind Advisory for American Falls Reservoir, north winds
20 to 30 mph with gusts up to 40 mph expected.
* WHERE...Lower Snake River Plain.
* WHEN...For the Frost Advisory, from 3 AM to 9 AM MDT Monday.
For the Lake Wind Advisory, from 6 AM to 9 PM MDT Monday.
* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft.
Frost could harm sensitive outdoor vegetation. Sensitive outdoor
plants may be killed if left uncovered.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Boaters on area lakes should use extra caution since strong winds
and rough waves can overturn small craft.
Take steps now to protect tender plants from the cold.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
501 PM MDT Sun May 17 2026
MTZ003-005-181500-
/O.CON.KMSO.FR.Y.0003.260518T0200Z-260518T1500Z/
Flathead/Mission Valleys-Missoula/Bitterroot Valleys-
501 PM MDT Sun May 17 2026
...FROST ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 9 AM
MDT MONDAY...
* WHAT...Temperatures as low as 28 degrees will result in frost
formation.
* WHERE...Flathead/Mission Valleys and Missoula/Bitterroot Valleys.
* WHEN...From 8 PM this evening to 9 AM MDT Monday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
* ADDITIONAL DETAILS...Low-lying areas of the Bitterroot Valley could
fall between 24 and 28 degrees.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
501 PM MDT Sun May 17 2026
MTZ004-181400-
/O.EXB.KMSO.FR.Y.0003.260518T0600Z-260518T1400Z/
Lower Clark Fork Region-
501 PM MDT Sun May 17 2026
...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT
MONDAY...
* WHAT...Temperatures between 25 and 34 degrees will result in frost
formation.
* WHERE...Lower Clark Fork Region.
* WHEN...From midnight tonight to 8 AM MDT Monday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
* ADDITIONAL DETAILS...Temperature ranges include:28 to 32 degrees in
Thompson Falls, 30 to 34 degrees in Plains, 33 to 37 degrees in
Noxon, 25 to 28 degrees in Haugan, 29 to 32 degrees in St. Regis,
and 29 to 34 degrees in Alberton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
1010 AM PDT Sun May 17 2026
IDZ001>004-WAZ033-036>038-181400-
/O.NEW.KOTX.FR.Y.0005.260518T0900Z-260518T1400Z/
Northern Panhandle-Coeur d`Alene Area-Idaho Palouse-Central
Panhandle Mountains-Washington Palouse-Spokane Area-Northeast
Mountains-Okanogan Highlands-
Including the cities of Fourth Of July Pass, Genesee, St. Maries,
Fairfield, Boulder Creek Road, Worley, Kettle Falls, Airway
Heights, Metaline Falls, Highway 20 Wauconda Summit, Osburn,
Plummer, Downtown Spokane, Dobson Pass, Pinehurst, Davenport,
Clark Fork, Chesaw Road, Tiger, Moscow, Pullman, Cheney, Athol,
Chewelah, Sandpoint, Rockford, Colville, Wallace, Bonners Ferry,
Colfax, Coeur d`Alene, La Crosse, Eastport, Oakesdale, Deer Park,
Ione, Priest River, Wauconda, Northport, Metaline, Newport,
Fernwood, Fruitland, Republic, Hayden, Orin-Rice Road, Kellogg,
Rosalia, Inchelium, Sherman Pass, Spokane Valley, Post Falls,
Tekoa, Flowery Trail Road, Uniontown, Schweitzer Mountain Road,
Lookout Pass, Mullan, Potlatch, and Springdale-Hunters Road
1010 AM PDT Sun May 17 2026
...FROST ADVISORY IN EFFECT FROM 2 AM TO 7 AM PDT MONDAY...
* WHAT...Low temperatures between 31 and 37 will result in frost
formation.
* WHERE...Genesee, St. Maries, Fairfield, Boulder Creek Road,
Worley, Kettle Falls, Airway Heights, Metaline Falls, Osburn,
Plummer, Downtown Spokane, Pinehurst, Davenport, Clark Fork,
Chesaw Road, Tiger, Moscow, Pullman, Cheney, Athol, Chewelah,
Sandpoint, Rockford, Colville, Wallace, Bonners Ferry, Colfax,
Coeur d`Alene, La Crosse, Eastport, Oakesdale, Deer Park, Ione,
Priest River, Wauconda, Northport, Metaline, Newport, Fernwood,
Fruitland, Republic, Hayden, Orin-Rice Road, Kellogg, Rosalia,
Inchelium, Spokane Valley, Post Falls, Tekoa, Flowery Trail Road,
Uniontown, Potlatch, and Springdale-Hunters Road.
* WHEN...From 2 AM to 7 AM PDT Monday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
Fewkes
