Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Riverton WY
453 AM MDT Thu Apr 2 2026

WYZ001>020-022>030-031500-
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-
453 AM MDT Thu Apr 2 2026

...Winter Storm Warnings and Winter Weather Advisories in effect for
western Wyoming through Friday afternoon...

...Winter Storm Warning in effect for the Bighorns from this evening
through Friday afternoon...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and tonight.

Moderate to heavy snowfall will be seen across most of the mountains.
Winter travel conditions are expected over passes. Lighter snow is
expected across western valleys today, moving to lower elevations
east of the Continental Divide tonight.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...Mountain snow continues, with light snow also across lower
elevations at times. Winter travel conditions are possible along
mountain passes, as well as the I-90 Corridor in northern Johnson
County.

.SPOTTER INFORMATION STATEMENT...

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

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
217 AM MDT Thu Apr 2 2026

WYZ001-012-022315-
/O.CON.KRIW.WS.W.0003.000000T0000Z-260404T0000Z/
Yellowstone National Park-Teton and Gros Ventre Mountains-
Including the cities of Mammoth, Old Faithful, and Lake
217 AM MDT Thu Apr 2 2026

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT FRIDAY...

* WHAT...Heavy snow. Total snow accumulations between 12 and 18
  inches and up to 24 inches along the western slopes of the Tetons.
  6 to 10 inches of total snow accumulation is expected in
  Yellowstone National Park, with amounts up to 18 inches along
  higher elevations across southern portions of the park. The
  Mammoth area will see 1 to 3 inches. Winds could gust as high as
  45 mph.

* WHERE...Teton and Gros Ventre Mountains and Yellowstone National
  Park.

* WHEN...Until 6 PM MDT Friday.

* IMPACTS...Travel could be very difficult, including over Teton
  Pass and Togwotee Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .

For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .

&&

$$

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
147 AM MDT Wed Apr 1 2026

WYZ001-012-020000-
/O.NEW.KRIW.WS.A.0004.260402T0500Z-260404T0000Z/
Yellowstone National Park-Teton and Gros Ventre Mountains-
Including the cities of Lake, Old Faithful, and Mammoth
147 AM MDT Wed Apr 1 2026

...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY
AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations between 12
  and 18 inches possible with locally up to 24 inches in the western
  slopes of the Tetons. In northern Yellowstone Park, 6 to 10 inches
  of snow is possible. Winds could gust as high as 40 mph.

* WHERE...Teton and Gros Ventre Mountains and Yellowstone National
  Park.

* WHEN...From this evening through Friday afternoon.

* IMPACTS...Travel could be very difficult, including over Teton and
  Togwotee Passes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

Hazard Report Provided By forecast.weather.gov