Cold Weather Advisory

URGENT - WEATHER MESSAGE
National Weather Service Great Falls MT
746 PM MST Fri Jan 23 2026

MTZ314-318-241600-
/O.NEW.KTFX.CW.Y.0002.260124T0246Z-260124T1600Z/
Fergus County below 4500ft-Snowy and Judith Mountains-
Including the following locations: Hilger and Lewistown
746 PM MST Fri Jan 23 2026

...COLD WEATHER ADVISORY IN EFFECT UNTIL 9 AM MST SATURDAY...

* WHAT...Very cold wind chills as low as 30 below.

* WHERE...Snowy and Judith Mountains and Fergus County below 4500ft.

* WHEN...Until 9 AM MST Saturday.

* IMPACTS...The dangerously cold wind chills as low as 20 below zero
  could cause frostbite on exposed skin in as little as 30 minutes.

* ADDITIONAL DETAILS...The coldest wind chills are expected early
  overnight.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution while traveling outside. Wear appropriate clothing, a
hat, and gloves.

&&

$$

AM

Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
1043 AM MST Fri Jan 23 2026

IDZ011>014-016-028-033-ORZ061>064-241900-
/O.EXT.KBOI.AS.Y.0001.000000T0000Z-260124T1900Z/
West Central Mountains-Lower Treasure Valley-Boise Mountains-
Upper Treasure Valley-Western Magic Valley-Camas Prairie-Upper
Weiser River-Harney County-Baker County-Malheur County-Oregon
Lower Treasure Valley-
Including the cities of Burns, Malheur City, Ontario, Cascade,
Warm Lake, Nyssa, Fruitvale, Ola, Soldier, McCall, Corral, Selby,
Cuprum, Mesa, Fairfield, Dunnean, Boise, Cambridge, Crane, New
Princeton, Council, Twin Falls, Blaine, Pine, Indian Valley,
Nampa, Prairie, Hill City, Big Creek, Baker, Anderson Dam, Bear,
Caldwell, Glendale, Buchanan, Diamond, Venator, and Goodrich
1043 AM MST Fri Jan 23 2026 /943 AM PST Fri Jan 23 2026/

...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL NOON MST /11 AM PST/
SATURDAY...

* WHAT...An extended period of stagnant air, with light winds and
  little vertical mixing. This is due to an inversion near the
  surface that will continue to trap pollutants.

* WHERE...Portions of south central and southwest Idaho and
  northeast and southeast Oregon.

* WHEN...Until noon MST /11 AM PST/ Saturday.

* IMPACTS...Poor air quality may cause issues for people with
  respiratory problems.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.

&&

$$

Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Riverton WY
258 AM MST Fri Jan 23 2026

WYZ001>020-022>030-241400-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn Basin-
Owl Creek and Bridger Mountains-Bighorn Mountains West-
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-Teton and Gros Ventre Mountains-
Jackson Hole-Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
258 AM MST Fri Jan 23 2026

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Rest of Tonight.

Much colder today with areas of light snow, especially East of the
Continental Divide.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday and Sunday...The coldest temperatures so far this
calendar year continue.

Saturday night and Sunday...Another chance of light snow, mainly
East of the Divide.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

$$