General Avalanche Hazard : Sunday the 22nd

  • Current Temps Base NA° Summit NA°
  • SnowFall Last 24 : 6"

  • SnowFall Next 24 : 6 to 12

Snow Fall Past 24 Hours

  • Past 24 Snow/Prec. Depth Total
  • Jackson: 6" 321 " 103 "
  • Targhee: 5" 91" 275"
  • Raymer: 6"/ 0.40 85" 280"
  • Rendez: 6"/ 0.40" 103" 321"
  • Joseph: 5"/ 0.35" 85" 262"

Weather Past 24 Hours

  • Past 24 At 10,400
  • 5 AM Temp : 8 º F

  • Max Temp : 17

  • AVG Wind Dir : Southwesterly

  • AVG Wind Speed : 17

  • Max Gust : 42

Todays Forecast

Southwesterly at 15 to 25 miles per hour.

Rising into the upper teens.

Expect a period of decreased cloud cover and a break in the snowfall this morning as a weak shortwave exits the region. A stronger Pacific weather system will move into the region from the southwest this afternoon with cloud cover increasing ahead of it.


General Advisory

GENERAL AVALANCHE ADVISORY Over the past few days, the Tetons have received around 10 inches of light density snow. Overnight, ridgetop winds picked up to 20 to 30 miles per hour with gusts to 42. The combination of new snow, snow available for transport and strong winds has created pockets of wind slab in upper elevation terrain. These slabs, along with loose snow sluffs, could be human triggered above 9,000 feet. Backcountry travelers might be able to trigger an isolated pocket of newly developed soft slab at the mid elevations, and the snowpack is mostly stable at the lower elevations.

Situation

SITUATION Western Wyoming was under mostly cloudy to overcast skies as a weak, Pacific disturbance moved into the area. This weather system produced periods of light, scattered snow showers which modestly picked up in the late afternoon. Mountain temperatures rose into the mid to upper teens as the valleys climbed into the mid 20s. Southerly ridgetop winds at 5 to 15 miles per hour this morning veered to the west and increased to 15 to 30 miles per hour in the afternoon. Late in the day on Friday, a skier triggered a small pocket of soft slab south of the Jackson Hole Mountain Resort. This slide occurred in very steep, northeast facing terrain at an elevation of around 10,300 feet. Shallow loose snow sluffs, which released naturally, were also reported in steep, upper elevation terrain in Grand Teton National Park. These slides were running on recently develop near surface facets, surface hoar and hard sun crusts. The loose, light density snow that has fallen over the past few days is readily available for wind transport.

FORECAST FOR Sunday, January 22, 2017 Periods of light snowfall will continue overnight before a brief lull takes place. By late afternoon, a more significant Pacific weather system will begin to impact the region. Overnight lows in the mountains will be near 10 degrees before rising into the upper teens during the day. Westerly ridgetop winds will range from 15 to 25 miles per hour. The general avalanche hazard could increase to Moderate in the Tetons depending on the amount of new snow and the strength of the winds. New soft slabs, along with loose snow sluffs, could be triggered by backcountry travelers in steep, avalanche prone terrain above 9,000 feet. These slabs are building just above well-developed sliding surfaces and weak, faceted snow. In the Greys River and Togwotee Pass forecast zones, the lingering chance of triggering deep persistent slab avalanches failing on weak snow near the base of the snowpack will keep the hazard at Moderate. New soft slabs and loose snow sluffs, similar to those in the Tetons, could also be triggered by skiers and riders. This avalanche activity will be more likely to occur down south where snowfall amounts are expected to be greater.

TREND FOR Monday, January 23, 2017 AND Tuesday, January 24, 2017 The storm system that will begin to affect the region on Sunday will last through Monday and possibly into Tuesday. The general avalanche hazard will continue to increase as new soft slabs gain depth and volume.

Weather Station Data

Snow Report Phone Numbers

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

Last Update : January 22 2017 9:07:08 AM

Page Cache: January 22 2017 11:05:27 AM

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Teton Pass ( Click to Zoom )

Top of Gondi

Base Area

Tram Line

Grand Targhee

Weather Station Data

Snow Report Phone Numbers

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Page Cache: January 22 2017 11:05:27 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.

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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.