General Avalanche Hazard : Sunday the 22nd

  • Current Temps Base NA° Summit NA°
  • SnowFall Last 24 : 7"

  • SnowFall Next 24 : 1 to 3

Snow Fall Past 24 Hours

  • Past 24 Snow/Prec. Depth Total
  • Jackson: 7" 38 " 22 "
  • Targhee: 11" 32" 40"
  • Raymer: 5"/ 0.64 17" 33"
  • Rendez: 7"/ 0.80" 22" 38"
  • Joseph: 10"/ 1.30" 27" 35"

Weather Past 24 Hours

  • Past 24 At 10,400
  • 5 AM Temp : 14 º F

  • Max Temp : 37

  • AVG Wind Dir : West-Southwesterly

  • AVG Wind Speed : 26

  • Max Gust : 56

Todays Forecast

West-southwest at 15 to 20 miles per hour with higher gusts

Rising into the 20s

Partly to mostly cloudy skies with scattered snow showers


General Advisory

GENERAL AVALANCHE ADVISORY Last nights storm favored the west slope of the Teton Range. At the upper elevations small pockets of wind slab could be triggered by skiers or riders who venture into steep avalanche terrain with fresh deposits of wind blown snow. The consequences of being caught in a slide present greater potential for injury due to the shallow snow cover. Avalanches are unlikely in terrain where last nights new snow accumulated on bare ground.

Situation

SITUATION A storm that passed through western Wyoming overnight has moved into the high plains. This system brought over a foot of snow to the west slope of the Teton Range, 5 to 7 inches to the east slope, 2 to 5 inches to the Togwotee Pass area and 1 to 3 inches to the Wyoming Range. Temperatures were above freezing at 10,500 feet when the storm began before noon yesterday. Temperatures at 10,500 were in the lower teens this morning and remained in the teens today. Winds have been from the northwest to the west-southwest at 15 to 20 with gusts to 40 miles per hour. This new snow fell on mostly bare ground on southwest, south and southeast facing terrain up to an elevation of 10,000 feet. It accumulated on old snow surfaces on northwest to northeast aspects above an elevation of 8,500 feet and on a mix of old snow and bare ground on west, and east aspects above an elevation of 9,000 feet. The old snow surfaces are mostly melt-freeze crusts and in some areas those crusts were wet when the storm began. At the highest elevations those old snow surfaces are comprised of wind-packed snow. In some well shaded, sheltered northerly aspects the new snow accumulated on loose faceted old snow surfaces. Snow depths at 9,500 feet range from 17 to 34 inches in the Teton Range, 8 to 18 inches in the Togwotee Pass area and up to 6 inches in the Wyoming Range. Another pulse of moisture from the eastern Pacific will move across northwest Wyoming after midnight. This system may track a little further north and is embedded in a warmer air mass. This system may bring several inches of snow to the mountains by morning. Skies will be mostly cloudy on Sunday with snow showers possibly mixing with rain showers in the afternoon and turning back to snow by evening. Temperatures in the mountains will be in the 20s overnight, rise into the 30s during the day and drop back into the 20s tomorrow night. Winds will be southwesterly at 20 to 30 with gusts to 40 miles per hour.

FORECAST FOR Sunday, October 22, 2017 The interface between the recent new snow and the old snow will be a potential bed surface for fresh wind avalanche events. At the upper elevations pockets of wind slab up to 18 inches in depth could be human triggered in steep avalanche starting zones. These slab avalanches could injure or bury a person. Avalanches are not likely in areas where the recent new snow lies upon bare ground. The general avalanche hazard is expected to be MODERATE at the upper elevations in the Teton area. A LOW avalanche hazard is expected in the other areas and below an elevation of 9,000 feet where the snowpack is still quite shallow.

TREND FOR Monday, October 23, 2017 AND Tuesday, October 24, 2017 Our weather will gradually become dryer and warmer as a high pressure ridge begins to build over the region. The general avalanche hazard will slowly decrease as the recent new snow settles and bonds to the old snow surfaces.

Weather Station Data

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

Last Update : October 22 2017 2:17:12 AM

Page Cache: October 22 2017 4:15:59 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

Emergency Phone Numbers

Page Cache: October 22 2017 4:15:59 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.