Station Name: Boiling River at Mammoth,YNP
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 5,686 feet

Nearest Address:
N Entrance Rd
Yellowstone National Park, WY 82190
Park County

GPS Coordinates: 44.9851333, -110.6893444

Nearby Water Temperatures

Winter Storm Watch issued April 21 at 2:55PM MDT until April 24 at 6:00AM MDT by NWS Billings MT

Effective: Tue April 21, 2026, 2:55 PM
Expires: Wed April 22, 2026, 3:00 PM

* WHAT...Heavy snow possible. Total snow accumulations between 8 and 15 inches possible. Winds could gust as high as 60 mph. * WHERE...Absaroka/Beartooth Mountains. * WHEN...From Wednesday evening through late Thursday night. * IMPACTS...Recreation in the high country could be impacted by heavy accumulating snow. Blowing snow could significantly reduce visibility. * ADDITIONAL DETAILS...The strongest winds are forecast Wednesday evening east of the Stillwater River Valley.

Monitor the latest forecast for updates on this situation.

Winter Storm Warning issued April 21 at 11:28PM MDT until April 24 at 6:00AM MDT by NWS Billings MT

Effective: Tue April 21, 2026, 11:28 PM
Expires: Wed April 22, 2026, 11:30 PM

* WHAT...Heavy snow expected. Total snow accumulations between 8 and 15 inches. Winds gusting as high as 60 mph. * WHERE...Absaroka/Beartooth Mountains. * WHEN...From 6 PM Wednesday to 6 AM MDT Friday. * IMPACTS...Recreation in the high country will be impacted by heavy accumulating snow. Blowing snow could significantly reduce visibility. * ADDITIONAL DETAILS...The strongest winds are forecast this evening east of the Stillwater River Valley.

Monitor the latest forecast for updates.

Winter Weather Advisory issued April 21 at 12:09PM MDT until April 23 at 11:00PM MDT by NWS Riverton WY

Effective: Tue April 21, 2026, 12:09 PM
Expires: Wed April 22, 2026, 7:00 AM

* 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.

Slow 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.

Winter Storm Watch issued April 21 at 2:20PM MDT until April 23 at 6:00PM MDT by NWS Great Falls MT

Effective: Tue April 21, 2026, 2:20 PM
Expires: Wed April 22, 2026, 6:15 AM

* 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.

Remember, 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.

Winter Storm Watch issued April 21 at 2:20PM MDT until April 24 at 12:00PM MDT by NWS Great Falls MT

Effective: Tue April 21, 2026, 2:20 PM
Expires: Wed April 22, 2026, 6:15 AM

* 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.

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.