45°40'N / 111°2'W / Altitude 1471 m / 15:41 2026/04/21, America/Denver (UTC-6)
From: 2026/04/21, 14:20
To: 2026/04/22, 06:15
* WHAT...Heavy, wet snow possible. Total snow accumulations between 2 and 8 inches possible, highest over the south and east portions of the Gallatin Valley. * WHERE...Gallatin Valley. * WHEN...From Thursday evening through Friday morning. * IMPACTS...Expect difficult driving conditions due to slush or snow covered roadways. The hazardous conditions could impact the Thursday evening and Friday morning commutes. * ADDITIONAL DETAILS...The heavy, wet snow may cause instances of power outages and or tree damage.
Gallatin,Gallatin Valley
Monitor the latest forecasts for updates on this situation.
To see a graphical representation of the degree of stress on young
livestock please visit our webpage and select Local Programs then
Cold Air Advisory for Newborn Livestock.
NWS Great Falls MT
2026/04/21, 14:20From: 2026/04/21, 14:20
To: 2026/04/22, 06:15
* WHAT...Heavy, wet snow possible. Total snow accumulations between 5 and 11 inches, with higher amounts over the mountain peaks. Winds could gust as high as 50 mph, highest for northern areas. * WHERE...Big Belt, Bridger and Castle Mountains, Little Belt and Highwood Mountains, and Gallatin and Madison County Mountains and Centennial Mountains. * WHEN...From Wednesday evening through Thursday afternoon. * IMPACTS...Expect difficult driving conditions due to slush or snow covered roadways. Falling and or blowing snow may significantly reduce visibility below a quarter mile at times. Tire chains may be required for some vehicles if traveling through mountain passes. Those with outdoor plans should be prepared for dangerous outdoor conditions. * ADDITIONAL DETAILS...The heavy, wet snow may cause instances of power outages and or tree damage.
GallatinRemember, a Winter Storm Watch means that there is at least a 50%
chance of impactful winter weather conditions during the watch
period.
To see a graphical representation of the degree of stress on young
livestock please visit our webpage and select Local Programs then
Cold Air Advisory for Newborn Livestock.NWS Great Falls MT2026/04/21, 14:20
From: 2026/04/21, 12:09
To: 2026/04/22, 07:00
* WHAT...Snow expected. Total snow accumulations between 6 and 12 inches with the highest amounts across southwestern portions of the Park. Winds gusting as high as 40 mph. * WHERE...Yellowstone National Park. * WHEN...From noon Wednesday to 11 PM MDT Thursday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Total snow amounts up to 3 inches at Mammoth.
GallatinSlow down and use caution while traveling.
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 current road conditions across Yellowstone National Park, visit
https://nps.gov/yellowstone.NWS Riverton WY2026/04/21, 12:09