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General Avalanche Hazard : Tuesday the 21st

  • Current Temps Base NA° Summit NA°
  • SnowFall Last 24 : 8"

  • SnowFall Next 24 : NA

Snow Fall Past 24 Hours

  • Past 24 Snow/Prec. Depth Total
  • Jackson: 8" 460 " 147 "
  • Targhee: 5" 104" 352"
  • Raymer: NA NA NA
  • Rendez: NA NA NA
  • Joseph: NA NA NA

Weather Past 24 Hours

  • Past 24 At 10,400
  • 5 AM Temp : NA

  • Max Temp : NA

  • AVG Wind Dir : NA

  • AVG Wind Speed : NA

  • Max Gust : NA

Todays Forecast


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General Advisory

NA

Situation

SITUATION Subtropical moisture continues to move into the region in a southwesterly flow. Dense snow continues to accumulate in the mountains. A rain/snow mix continues to fall at the lower elevations. Mountain temperatures have been mostly in the 20s. With a freezing level at an elevation of about 6,500 feet, temperatures at the lowest elevations have been in the mid-30s. Winds have backed to the southwest at 20 to 35 with gusts to 55 miles per hour. Snowfall totals since Friday evening are up to 28 inches with over 3 inches of moisture on the east side of the Teton Range. In other areas the mountains have received 8 to 12 inches of new snow during this period. Valley locations have received up to an inch of rain. On Saturday a snowboarder was caught and carried the entire length of the East Hourglass Couloir on New Perce Mountain. On Sunday a skier was caught and carried a short distance on a northeast aspect of Four Pines, south of the Jackson Hole Mountain Resort. Today a guided skier was caught, carried and injured in the same area. In the late afternoon a skier triggered a slab avalanche with a three foot deep crown north of the boundary of the Jackson Hole Mountain Resort. That slide ran almost to Granite Creek. Similar events are likely on Tuesday, however with more snow in the forecast overnight and during the day, the consequences of being caught in an avalanche are likely to be more severe.

FORECAST FOR Tuesday, February 21, 2017 Periods of moderate to heavy snowfall and strong winds will continue. Snowfall rates of two inches per hour could occur for extended periods. One to two feet of new snow is forecast to fall in the mountains by Tuesday evening. Temperatures will be in the 20s and 30s in the mountains and above freezing below an elevation of 6,500 feet. Winds will be southwest at 25 to 30 with gusts to near 50 miles per hour. The new snow and strong winds will continue to increase the avalanche hazard. Dense surface slabs two to four feet in depth are likely to be easily triggered by humans and may release naturally in steep avalanche prone terrain at the mid and upper elevations. These slides have been running long distances and can impact the lower elevations where they also entrain wet snow. The general avalanche hazard is expected to be CONSIDERABLE at the mid and upper elevations and may increase to HIGH in the Teton Range where new snow totals for the past several days have been significantly higher than other areas. Dangerous conditions are expected. Humans who venture into steep couloirs and active avalanche starting zones are likely to trigger dangerous dense slab avalanches. Potential slide surfaces include a rain crust buried surface hoar, density breaks and buried graupel snow. Wet slides are possible at the lower elevations.

TREND FOR Wednesday, February 22, 2017 AND Thursday, February 23, 2017 Cooler air will move into the region. Snowfall intensity is forecast to decrease. The general avalanche hazard is expected to remain elevated but slowly decrease.

Weather Station Data

Snow Report Phone Numbers

Emergency Phone Numbers

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Data Provided by :http://www.jhavalanche.org | http://www.jacksonhole.com

Last Update : February 21 2017 2:03:43 AM

Page Cache: February 21 2017 2:40:04 AM

We do not guarantee the accuracy of any of this information. This site is just a tool to help you make better decisions in the mountains. If you have a suggestion about how to make this site better email me.

Teton Pass ( Click to Zoom )

Top of Gondi

Base Area

Tram Line

Grand Targhee

Weather Station Data

Snow Report Phone Numbers

Emergency Phone Numbers

Page Cache: February 21 2017 2:40:04 AM

We do not guarantee the accuracy of any of this information. This site is just a tool to help you make better decisions in the mountains. If you have a suggestion about how to make this site better email me.

Radar Images ( Click to zoom )





Forecast Data from http://www.noaa.gov/

Weather Station Data

Snow Report Phone Numbers

Emergency Phone Numbers

We do not guarantee the accuracy of any of this information. This site is just a tool to help you make better decisions in the mountains. If you have a suggestion about how to make this site better email me.