This is an ARCHIVED avalanche advisory, in a text only version. This is for DECEMBER 29, 2017 from the Jackson Hole avalanche center. It covers the area south of Jackson including the Salt River Range area where a fatal incident occurred on this day. SOUTHWEST TRAILS/GREY'S RIVER AREA ARCHIVE Issued at 12/29/2017 06:26 Valid Until: 12/29/2017 23:59 CURRENT CONDITIONS (Mountain Weather Past 24 Hours) At 10,400' Elevation: 5 AM Temp: 19 º F Max Temp: 22 Avg Wind Direction: Westerly Avg. Wind Speed: 49 Max Wind Gust: 95 Location - Snowfall/Prec. Total Snow Depth Total Snowfall At 9,330' Elevation (Commissary Ridge Plot) - 0"/ 0.00 56" 127" At 9,000' Elevation (Blind Bull Meadow Plot)) - 0"/ 0.00" 46" 121" At 6,300' Elevation (Box Y Ranch Plot) - 0"/ 0.00" 30" 86" Mountain Weather Forecast for 12/29/2017 Snow is to fall throughout the day. Temperature Forecast for 8,000´-9,000´: Rising into the upper twenties. Ridge Top Wind Forecast for 10,000´: Southwesterly at 20-30 mph. Snowfall Expected Next 24 Hours: 5-10 AVALANCHE DANGER: CONSIDERABLE GENERAL AVALANCHE ADVISORY Avalanche conditions remain VERY DANGEROUS. Above 7500 feet, unstable slabs lie upon faceted snow and hard crusts on all aspects. These persistent slabs could be triggered by the weight of a single person and will increase in both size and sensitivity today as they are further loaded by new snow and very strong winds. These slabs can be small, involving wind loaded features or very large, involving entire bowls. Analysis of both terrain and the snowpack is essential today and making conservative decisions could save your life. The persistent slab problem also extends into lower elevation terrain where smaller slabs lie upon surface hoar on northerly aspects. As snowfall accumulates this afternoon, sensitive but shallow wind slabs will develop. TODAY'S AVALANCHE PROBLEMS Persistent Slab LIKELIHOOD - Likely SIZE - Large to Very Large TREND - Increasing danger DESCRIPTION - Slab avalanches that could be small to very large, are likely to be human triggered on a variety of aspects above an elevation of 7,000 feet. These slabs could have depths to as much as four feet at the higher elevations.