Winter Weather Advisory

URGENT - WINTER WEATHER MESSAGE
National Weather Service Billings MT
626 AM MST Tue Jan 20 2026

MTZ058-138-WYZ199-210000-
/O.CON.KBYZ.WW.Y.0001.260120T1500Z-260121T0000Z/
Southern Rosebud-Southern Big Horn-Sheridan Foothills-
Including the locations of Lame Deer, Big Horn, Wyola, Clearmont,
Ashland, Ranchester, Sheridan, Birney, Dayton, Pryor, and Lodge Grass
626 AM MST Tue Jan 20 2026

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...Areas of snow and blowing snow expected. Total snow
  accumulations up to two inches, greatest over the hills and near
  the Bighorn and Pryor Mountains. Northwest winds gusting as high as
  50 mph.

* WHERE...In Montana, Southern Big Horn and Southern Rosebud. In
  Wyoming, Sheridan Foothills.

* WHEN...Until 5 PM MST this afternoon.

* IMPACTS...Plan on slick roads and poor visibility. This includes
  I-90 from Lodge Grass to Sheridan, and US-212 over Lame Deer
  Divide. Hazardous conditions could impact the evening commute.

* ADDITIONAL DETAILS...Worst travel conditions are expected to occur
  between 10 am and 3 pm.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. For the latest road
conditions, call 5 1 1.

&&

$$

Additional graphics for this hazard can be found at
http://www.weather.gov/billings

Lester

Special Weather Statement

Special Weather Statement
National Weather Service Great Falls MT
546 AM MST Tue Jan 20 2026

MTZ312>314-317-318-201800-
Cascade County below 5000ft-Judith Basin County and Judith Gap-
Fergus County below 4500ft-Little Belt and Highwood Mountains-
Snowy and Judith Mountains-
Including the cities of Great Falls, Raynesford, Geyser,
Stanford, Windham, Benchland, Hobson, Moccasin, Hilger,
Lewistown, Monarch, Neihart, and Kings Hill Pass
546 AM MST Tue Jan 20 2026

...Locally reduced visibility in areas of snow or snow showers
this morning across portions of north-central Montana...

An area of light snow or snow showers will develop across central
Montana this morning with the most persistent activity near the
Little Belt and Snowy mountains. Snow accumulation of 2 to 4
inches is possible across the higher elevations in the mountains
with up to one inch in areas immediately north of the Little Belts
and Snowies, including adjacent portions of Judith Basin and
Fergus counties. Travelers along US-87 from Belt east to the
Lewistown divide and on US-89 over Kings Hill should expect areas
of reduced visibility this morning. Snow showers will decrease by
early this afternoon.

$$

Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1057 AM PST Thu Jan 15 2026

IDZ005>007-210000-
/O.EXT.KMSO.AS.Y.0001.000000T0000Z-260121T0000Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
Orofino/Grangeville Region-
1057 AM PST Thu Jan 15 2026

...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL 4 PM PST TUESDAY...

* WHAT...Stagnation conditions will trap pollutants, leading to
  deteriorating air quality, particularly in lower elevations and
  valleys.

* WHERE...Orofino/Grangeville Region, Southern Clearwater Mountains,
  and Northern Clearwater Mountains.

* WHEN...Until 4 PM PST Tuesday.

* IMPACTS...Periods of air stagnation can lead to the build up of
  pollutants near the surface.

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.

According to state air quality agencies, prolonged period of
stagnant air can hold pollutants close to the ground where people
live and breathe. Check with your local burn agency for any current
restrictions in your area.

&&

$$

Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Riverton WY
258 AM MST Tue Jan 20 2026

WYZ001>020-022>030-211400-
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 Tue Jan 20 2026

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Rest of Tonight.

Gusty to strong wind across much of the area this afternoon. Snow
may cause difficult travel conditions in Johnson County from late
this morning into early afternoon.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Thursday and Friday...Colder temperatures returning East of the
Divide.

.SPOTTER INFORMATION STATEMENT...

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

$$