Station Name: Firehole River at Old Faithful, YNP
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 7,372 feet

Nearest Address:
Mallard Lake Trail
Yellowstone National Park, WY 82190
Teton County

GPS Coordinates: 44.4593333, -110.8222722

Nearby Water Temperatures

Winter Storm Warning issued April 15 at 11:56AM MDT until April 17 at 6:00AM MDT by NWS Riverton WY

Effective: Wed April 15, 2026, 11:56 AM
Expires: Thu April 16, 2026, 7:00 AM

* WHAT...Heavy snow expected. Total snow accumulations between 9 and 18 inches, with the highest elevations could see up to 20 inches. Winds gusting between 30 and 50 mph. Higher elevations could gust up to 55 mph. * WHERE...Absaroka Mountains, Teton and Gros Ventre Mountains, and Yellowstone National Park. * WHEN...From 6 PM this evening to 6 AM MDT Friday. * IMPACTS...Travel could be very difficult, especially across Teton Pass and Togwotee Pass. Strong winds will cause limited visibility.

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 .

Freeze Warning issued April 15 at 1:30PM MDT until April 17 at 10:00AM MDT by NWS Pocatello ID

Effective: Wed April 15, 2026, 1:30 PM
Expires: Thu April 16, 2026, 4:30 AM

* WHAT...For the first Freeze Warning, sub-freezing temperatures 24 to 32 degrees. A Hard Freeze is possible. For the second Freeze Warning, sub-freezing temperatures 15 to 20 degrees. A Hard Freeze is expected. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...For the first Freeze Warning, from 3 AM to 10 AM MDT Thursday. For the second Freeze Warning, from 3 AM to 10 AM MDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.

Winter Weather Advisory issued April 15 at 1:30PM MDT until April 17 at 6:00AM MDT by NWS Pocatello ID

Effective: Wed April 15, 2026, 1:30 PM
Expires: Thu April 16, 2026, 4:30 AM

* WHAT...Snow expected above 6500 feet elevation. Total snow accumulations between 6 and 11 inches. Snow below 6500 feet elevation will accumulate 2 to 6 inches. Winds gusting as high as 45 mph. * WHERE...Centennial Mountains - Island Park and Bear River Range. * WHEN...From 6 PM this evening to 6 AM MDT Friday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Wednesday evening and Thursday morning commutes. Gusty winds could bring down tree branches.

Slow down and use caution while traveling. Call 5 1 1 or visit 511.idaho.gov for the latest road conditions.

Freeze Warning issued April 15 at 1:30PM MDT until April 16 at 10:00AM MDT by NWS Pocatello ID

Effective: Wed April 15, 2026, 1:30 PM
Expires: Thu April 16, 2026, 4:30 AM

* WHAT...For the first Freeze Warning, sub-freezing temperatures 24 to 32 degrees. A Hard Freeze is possible. For the second Freeze Warning, sub-freezing temperatures 15 to 20 degrees. A Hard Freeze is expected. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...For the first Freeze Warning, from 3 AM to 10 AM MDT Thursday. For the second Freeze Warning, from 3 AM to 10 AM MDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.