Daily Winter Weather Report
Date: Monday - December 20, 2010
| Station | Max Temp | Min Temp | Pres Temp | New Snow | Snow Depth | BC | OC | SC | Present Conditions |
| Canyon | 27 | 10 | 10 | 6 | 34 | X | Calm | ||
| East Entrance | 30 | 22 | 25 | 1 | |||||
| Grant Village | 26 | -5 | 15 | 8 | 47 | X | Gusts up to 25mph | ||
| Lake | 28 | 14 | 16 | 10.5 | 35 | X | Calm | ||
| Lamar | 35 | 15 | 20 | 5 | 17 | X | Calm | ||
| Madison | 38 | 16 | 33 | - | - | ||||
| Mammoth | 32 | 14 | 27 | T | 13 | ||||
| Old Faithful | 30 | 17 | 17 | 2 | 29 | X | Windy | ||
| Snake River | 30 | -1 | 21 | 7 | 40 | X | Winds 15-20mph | ||
| Tower | 33 | 14 | 14 | 4 | 20 | X | Calm | ||
| West Entrance | 29 | 14 | 14 | 5.5 | 31 | X | Gusty winds |
SPECIAL INFORMATION
Avalanche Information (12-19-2010)
The northern Madison Range, the mountains around Cooke City and the Washburn Range: The combination of new snow and wind has likely pushed the snowpack in these areas to its breaking point. Human triggered avalanches will be very likely on all wind loaded slopes and the avalanche danger is rated HIGH. A CONSIDERABLE avalanche danger exists on all slopes that have not received wind loading.
The southern Gallatin and Madison Ranges and the Lionhead area near West Yellowstone: Today wind loaded slopes are the main avalanche concern, but triggering a deeper slab is still possible. Layers of buried surface hoar and small grained facets do exist 1-2 feet below the surface, warranting careful snowpack evaluation and cautious route finding. Today human triggered avalanches are likely on wind loaded slopes and the avalanche danger is rated CONSIDERABLE. All slopes that are void of wind loading have a MODERATE avalanche danger.
Yellowstone National Park Weather Forecast on 20 December 2010 by the NWS Riverton, WY
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Rest Of Today: Windy. Areas of blowing snow through the day. Snow early in the morning. Snow likely late in the morning...then chance of snow in the afternoon. New snow accumulation around 1 inch. Total snow accumulation 2 to 4 inches. Highs 20°F to 26°F. Southwest winds 20 to 30 mph with gusts to around 45 mph. Chance of snow near 100 percent. Tonight: Breezy. Mostly cloudy. Areas of blowing snow in the evening. Slight chance of snow in the evening...then chance of snow after midnight. Lows 6°F to 12°F. Southwest winds 15 to 25 mph. Chance of snow 40 percent. Tuesday: Mostly cloudy in the morning then becoming partly cloudy. Patchy freezing fog in the morning. A 20 percent chance of snow. Highs 21°F to 27°F. South winds around 15 mph early in the morning. Tuesday Night: Partly cloudy. Chance of snow after midnight. Lows 9°F to 15°F. Southeast winds around 15 mph after midnight. Chance of snow 40 percent. Wednesday: Cloudy with a 50 percent chance of snow. Highs 25°F to 31°F. South winds around 15 mph in the afternoon. Wednesday Night: Mostly cloudy with a 40 percent chance of snow. Near steady temperature in the mid 20s. Thursday: Cloudy with a 40 percent chance of snow. Highs 25°F to 31°F. Thursday Night: Colder. Mostly cloudy with a 20 percent chance of snow. Lows 8°F to 14°F. Friday: Partly cloudy. Highs 22°F to 28°F. Friday Night: Partly cloudy. Lows 9°F to 15°F. Christmas Day: Partly cloudy. Highs 26°F to 32°F. Saturday Night: Partly cloudy with a 20 percent chance of snow. Lows 14°F to 20°F. Sunday: Partly cloudy with a 20 percent chance of snow. Highs 24°F to 30°F.
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******** FOR CURRENT ROAD INFORMATION PLEASE CALL 307-344-2117********
Date: Monday, December 20, 2010
| ROAD | DATE OPEN | Admin | Conditions | Public Access |
| Gardiner to Mammoth | YR | STR | STR | STR |
| Mammoth to Tower | YR | STR | STR | STR |
| Tower to NE Entrance | YR | STR | STR | STR |
| Beartooth Highway | CLOSED | No | CLOSED | CLOSED |
| Canyon to Lake | Open | Yes | Fair | Oversnow |
| Grant to South Entrance | Open | Yes | Poor | Oversnow |
| Junction to Chief Joseph Hwy | CLOSED | No | CLOSED | CLOSED |
| Lake to East Entrance | 12/22 | No | Poor | None |
| Lake to West Thumb | Open | Yes | Good | Oversnow |
| Madison to Old Faithful | Open | Yes | Good | Oversnow |
| Madison to West Yellowstone | Open | Yes | Good | Oversnow |
| Mammoth to Norris | Open | Yes | Fair | Oversnow |
| Norris to Canyon | Open | Yes | Good | Oversnow |
| Norris to Madison | Open | Yes | Good | Oversnow |
| Old Faithful to Grant | Open | Yes | Good | Oversnow |
YR = Year Round ⁄ NR = No Restrictions ⁄ STA = Snow Tires Advised ⁄ STR = Snow Tires Required
* NOTE: CLOSED FOR THE SEASON.
# Poor road conditions - bare spots and melting snow - Restricted to Snowcoaches Only.
The park service plowing schedule for roads for the spring season.
Back to the Yellowstone Daily Winter Reports or the Yellowstone Weather Page
Information provided by the National Weather Service and Yellowstone National Park Service
| Yellowstone National Park WebCams | |||||||
|---|---|---|---|---|---|---|---|
| Old Faithful Live | All Old Faithful | Old Faithful Static | Old Faithful VC | North Entrance | Mt Washburn | Mammoth | YVO WebCam |
| Yellowstone Area Highway WebCams | |
|---|---|
| Alpine Junction Hwy 89 (South) | Monida Pass I-15 (North) |
| Bozeman Pass I-90 (North) | Osborne Bridge Hwy 20 (West) |
| Henry's Lake North Hwy 20 (West) | Raynolds Pass MT 87 (North or West) |
| Henry's Lake South Hwy 20 (West) | Teton Pass WY 22 (South) |
| State Road Reports | |
|---|---|
| Idaho | Utah |
| Montana | Wyoming |
| Gardiner, Montana | Silver Gate, Montana | West Yellowstone, Montana | Cooke City, Montana |
| Livingston, Montana | Cody, Wyoming | Jackson Hole, Wyoming | Yellowstone National Park |
| Links | |
|---|---|
| The Great Outdoors Net | Great Outdoor Recreational Places |
| Gardiner, Montana | World Humanity |
by John William Uhler
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