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

Elevation Above Sea Level: 5,686 feet / 1,733 meters

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

GPS Coordinates: 44.9851333, -110.6893444

Nearby Water Temperatures

Winter Weather Advisory issued December 21 at 3:04AM MST until December 22 at 5:00AM MST by NWS Billings MT

Effective: Sun December 21, 2025, 10:04 AM
Expires: Mon December 22, 2025, 10:15 AM

* WHAT...Rain and snow showers expected with areas of freezing rain or drizzle possible. Total snow accumulations up to one inch and ice accumulations around a light glaze. Winds gusting as high as 30 mph. * WHERE...Portions of central and south central Montana. * WHEN...From 2 PM this afternoon to 5 AM MST Monday. * IMPACTS...Roads, and especially bridges and overpasses, could become slick and hazardous. * ADDITIONAL DETAILS...Motorists along I-90 around the Big Timber area, and along US-191 from Big Timber to Harlowton, should be alert for sudden changes in driving conditions and slick roads late today through the evening.

Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be icy and slippery, increasing your risk of a fall and injury.

Winter Storm Warning issued December 21 at 3:04AM MST until December 22 at 5:00PM MST by NWS Billings MT

Effective: Sun December 21, 2025, 10:04 AM
Expires: Mon December 22, 2025, 10:15 AM

* WHAT...Periods of heavy snow. Total snow accumulations of 1 to 3 feet, mainly on south and west facing slopes. Winds gusting as high as 40 mph. * WHERE...Absaroka/Beartooth Mountains and Crazy Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Recreation in the high country will be impacted by heavy accumulating snow and blowing snow. * ADDITIONAL DETAILS...Avalanche danger will continue.

Be prepared for difficult winter conditions if you have plans in the backcountry.

Avalanche Warning issued December 21 at 6:04AM MST by NWS Billings MT

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Sun December 21, 2025, 1:04 PM
Expires: Mon December 22, 2025, 1:15 PM

AVWBYZ The following message is transmitted at the request of the Gallatin National Forest Avalanche Center. The Gallatin NF Avalanche Center in Bozeman has issued a BACKCOUNTRY AVALANCHE WARNING for the following areas: * WHAT...The Gallatin National Forest Avalanche Center is issuing an avalanche warning. The avalanche danger is HIGH on all slopes. Natural and human-triggered slides are very likely. * WHERE...The mountains near Island Park, West Yellowstone and Cooke City. * WHEN...In effect until Mon 05:30 AM MST. * IMPACTS...Heavy snowfall on a snowpack with unstable weak layers will make human triggered avalanches very likely. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche conditions exist. Backcountry travelers should stayoff steep slopes and away from the bottom of steep slopes. Avalanches can be triggered from flat terrain. Steep slopes can avalanche far above and run into lower-angled terrain. Consult http://www.mtavalanche.com or www.avalanche.org for more detailed information. Similar avalanche danger may exist at locations outside the coverage area of this or any avalanche center.

Winter Weather Advisory issued December 21 at 2:32AM MST until December 22 at 9:00AM MST by NWS Great Falls MT

Effective: Sun December 21, 2025, 9:32 AM
Expires: Sun December 21, 2025, 11:15 PM

* WHAT...Snow and expected. Total snow accumulations 1 to 4 inches over the valleys and 4 to 10 inches at and above pass level. The snow may mix with light freezing rain or drizzle this evening and tonight with ice accumulations up to a glaze. Winds may gust as high as 40 mph at times. * WHERE...Gallatin and Madison County Mountains and Centennial Mountains and Northwest Beaverhead County. * WHEN...Until 9 AM MST Monday. * IMPACTS...Plan for winter driving conditions. Sidewalks and other surfaces may become icy and slippery in areas that observe freezing rain or drizzle.

Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1 or visiting the MDT Road Report website.

Winter Storm Warning issued December 21 at 1:35AM MST until December 22 at 5:00PM MST by NWS Riverton WY

Effective: Sun December 21, 2025, 8:35 AM
Expires: Sun December 21, 2025, 11:00 PM

* WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes.

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 .

Avalanche Warning issued December 21 at 6:04AM MST by NWS Great Falls MT

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Sun December 21, 2025, 1:04 PM
Expires: Mon December 22, 2025, 1:15 PM

AVWTFX The Gallatin National Forest Avalanche Center has issued an avalanche warning. * WHAT... The avalanche danger is HIGH on all slopes. Natural and human-triggered slides are very likely. * WHERE...The mountains near Island Park, West Yellowstone * WHEN...In effect through Monday 530 AM MST. * IMPACTS...Heavy snowfall on a snowpack with unstable weak layers will make human triggered avalanches very likely. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche conditions exist. Backcountry travelers should stay off steep slopes and away from the bottom of steep slopes. Avalanches can be triggered from flat terrain. Steep slopes can avalanche far above and run into lower-angled terrain. Consult http://www.mtavalanche.com or www.avalanche.org for more detailed information. Similar avalanche danger may exist at locations outside the coverage area of this or any avalanche center.

Winter Storm Warning issued December 21 at 9:13AM MST until December 22 at 5:00PM MST by NWS Riverton WY

Effective: Sun December 21, 2025, 4:13 PM
Expires: Mon December 22, 2025, 7:00 AM

* WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes.

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 .