WWUS75 KPIH 181809
NPWPIH

URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
1209 PM MDT Mon May 18 2026

IDZ054-191100-
/O.NEW.KPIH.FZ.W.0016.260519T0600Z-260519T1500Z/
/O.CON.KPIH.LW.Y.0006.000000T0000Z-260519T0300Z/
Lower Snake River Plain-
Including the cities of Shelley, Blackfoot, American Falls, Fort
Hall, and Pocatello
1209 PM MDT Mon May 18 2026

...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING 
FOR AMERICAN FALLS RESERVOIR...
...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT 
TUESDAY...

* WHAT...For the Lake Wind Advisory for American Falls Reservoir, 
  north winds 10 to 20 mph with gusts up to 30 mph. For the Freeze 
  Warning, sub-freezing temperatures as low as 20 expected.

* WHERE...Lower Snake River Plain.

* WHEN...For the Lake Wind Advisory, until 9 PM MDT this evening. 
  For the Freeze Warning, from midnight tonight to 9 AM MDT Tuesday.

* IMPACTS...Strong winds and rough waves on area lakes will create 
  hazardous conditions for small craft. Frost and freeze conditions 
  could kill crops, other sensitive vegetation and possibly damage 
  unprotected outdoor plumbing.

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.

&&

$$

IDZ052-053-191100-
/O.NEW.KPIH.FZ.W.0016.260519T0600Z-260519T1500Z/
Arco/Mud Lake Desert-Upper Snake River Plain-
Including the cities of Craters of the Moon NM, St. Anthony, INL,
Rexburg, Mud Lake, and Idaho Falls
1209 PM MDT Mon May 18 2026

...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT 
TUESDAY...

* WHAT...Sub-freezing temperatures as low as 20 expected.

* WHERE...Arco/Mud Lake Desert and Upper Snake River Plain.

* WHEN...From midnight tonight to 9 AM MDT Tuesday.

* 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.

&&

$$

IDZ051-055-191100-
/O.NEW.KPIH.FR.Y.0006.260519T0900Z-260519T1500Z/
Shoshone/Lava Beds-Eastern Magic Valley-
Including the cities of Shoshone, Rupert, Heyburn, Richfield,
Burley, Oakley, and Carey
1209 PM MDT Mon May 18 2026

...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM MDT TUESDAY...

* WHAT...Temperatures as low as 26 will result in frost formation.

* WHERE...Eastern Magic Valley and Shoshone/Lava Beds.

* WHEN...From 3 AM to 9 AM MDT Tuesday.

* 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.

Messick