WWUS75 KPIH 181053
NPWPIH

URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
453 AM MDT Mon May 18 2026

IDZ051-052-181500-
/O.CON.KPIH.FZ.W.0015.000000T0000Z-260518T1500Z/
Shoshone/Lava Beds-Arco/Mud Lake Desert-
Including the cities of Richfield, INL, Mud Lake, Carey, Craters
of the Moon NM, and Shoshone
453 AM MDT Mon May 18 2026

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING...

* WHAT...Sub-freezing temperatures 28 to 32 expected.

* WHERE...Shoshone/Lava Beds and Arco/Mud Lake Desert.

* WHEN...Until 9 AM MDT this morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

IDZ054-190300-
/O.CON.KPIH.FR.Y.0005.000000T0000Z-260518T1500Z/
/O.CON.KPIH.LW.Y.0006.260518T1200Z-260519T0300Z/
Lower Snake River Plain-
Including the cities of Fort Hall, American Falls, Shelley,
Pocatello, and Blackfoot
453 AM MDT Mon May 18 2026

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING...
...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING 
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, until 9 AM MDT this morning. For 
  the Lake Wind Advisory, until 9 PM MDT this evening.

* 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.

&&

$$

IDZ053-055-181500-
/O.CON.KPIH.FR.Y.0005.000000T0000Z-260518T1500Z/
Upper Snake River Plain-Eastern Magic Valley-
Including the cities of Oakley, Rupert, Burley, Heyburn, Rexburg,
St. Anthony, and Idaho Falls
453 AM MDT Mon May 18 2026

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING...

* 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...Until 9 AM MDT this morning.

* 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.

JKeyes