Date Issued: | 2017-01-22 07:52:14 |
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Danger: | 2 |
Primary Trend: | 2 |
Primary Probability: | 3 |
Primary Likelihood: | 3 |
Primary Size: | 1 |
Primary Description: | We saw quite a bit of windslab avalanche activity in the region yesterday. Most of these smaller events in the new snow... but be aware they are quite trigger sensitive right now with cold snow on a hard bed surface. Avoid terrain with high consequences especially in windloaded areas. |
Secondary Trend: | 1 |
Secondary Probability: | 8 |
Secondary Likelihood: | 2 |
Secondary Size: | 1 |
Secondary Description: | Be aware this wind event also builds cornices around the region and even though the snow volumes were quite low be aware that these cornices grow fast in the wind and a cornice fall onto a windslab would surely raise consequences of any avalanche activity. |
Discussion: | The National Weather Service Forecasts- Today- Snow developing. Snow accumulation to 1 inch. Highs around 30. East wind 10 to 20 mph. Tonight- Snow. Snow accumulation 1 to 2 inches. Temperatures remaining around 30. Southeast wind 10 mph. Monday- Rain and snow. Snow accumulation 1 to 2 inches. Snow level 400 feet. Highs around 35. Light winds. The last week was quite wet around the region with above freezing temps all the way to our mountain summits at times. Temperatures cooled two days ago allowing the snowpack to solidify and lock back up. The lower snowpack is strong and stable in place for the most part. We then received a few centimeters of new snow. This new snow is not bonding well in all areas. We also received a fair amount of wind. This new snow was easily transported and we have seen weak wind slabs building around the region. These windslab avalanches are likely both naturally in areas continuing to load and man made if you should venture into the wrong place on the slab. Be aware that yesterday human triggered avalanches were occurring around the region. Temperatures have warmed a fair amount over the last 24 hours. This morning Eaglecrest Powder Patch gauge has warmed to -5c(23f) from yesterdays low of -10.5c(13f). Mt Roberts is showing 22f this morning. Winds have calmed for the time being yet todays forecast calls for continued windloading. Although the forecast calls for new snow windloading will remain the primary concern with snow values being quite low over the next 24 hours. With Natural Avalanche Possible and Human Triggered Likely Avalanche Danger is CONSIDERABLE at this time. Chose your terrain wisely. Think of how the winds lay on the land and imagine where those wind slabs are lurking... Avoid steep concex slopes in windloaded areas and be aware that the base layer is quite hard and icy in places which could turn a very small avalanche into a slide for life situation... These slides will be quite fast right now. Be safe out there and have a great day. |
Tip: | Here is a link to a Wind Slab tutorial done by Bruce Tremper of the Utah Avalanche Center. https://www.youtube.com/watch?v=-m8kPGOxTHA |
Forecaster: | Tom Mattice |