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Archived Avalanche Advisories from the Mount Shasta Avalanche Center

Use this page to view archived advisories. The table below shows the overall danger rating and the bottom line for the 20 most recent advisories. Click on the time and date link above each danger rating icon to view the full advisory for that day. Use the date chooser or the pager at the bottom to scroll through the older advisories.

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Date the advisory was published: Bottom Line
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March 10, 2013 at 7:05 am

For today, the overall avalanche danger is LOW with pockets of   MODERATE in upper elevation wind loaded slopes with a North and Northeasterly aspect. The new snow has bonded well to the old snow and no avalanche activity has been observed or reported.

 

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March 9, 2013 at 6:57 am

For today, the avalanche danger is LOW for low and mid elevations and  MODERATE on the upper elevations. The new snow has bonded well to the old snow and no avalanche activity has been observed or reported.

 

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March 8, 2013 at 7:04 am

For today, the avalanche danger remains LOW for lower aspects and elevations and  MODERATE on the mid and upper elevations.. The existing snowpack looks to be handleing the new snow well but with the accompanying winds we should expect some wind slabs, storm slabs, and crossloading. Weak interfaces have been observed in the new storm where slight density changes exist but overall the storm snow is bonding well to the old snow surface.

 

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March 7, 2013 at 7:18 am

For today, the avalanche danger remains LOW for lower aspects and elevations and has increased to MODERATE on the mid and upper elevations. Our storm totals are approaching 2 feet in the deepest places heightening our avalanche conditions and making human triggered avalanches possible. The existing snowpack looks to be handleing the new snow well but with the accompanying winds we should expect some wind slabs, storm slabs, and crossloading. Yesterday weak interfaces were observed in the new storm snow 30-35 cm below the surface. They didn't have much energy or a high quality shear but were failing easliy with comprssion tests (ct4&5, Q2).

 

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March 3, 2013 at 7:00 am

For today, the overall avalanche danger remains LOW for all aspects and elevations. We received a trace of new snow over the past 12 hours with light to moderate NW winds. Instabilities are unlikely today. Most other areas have been scoured down to the old, firm snow surface and/or entered a melt/freeze cycle. Normal caution advised.

We are expecting the avalanche danger to rise on late Tuesday and Wednesday, 3-5 and 3-6. Up to 1" inch of water and moderate to strong Southwest winds are expected for this storm. This could mean several inches of snow in town and more above 6,000 feet. A firm snowpack in place will provide a great bed surface for this new snow to potentially slide on. Stay tuned for potential advisory updates as the week progresses.

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March 2, 2013 at 6:59 am

For today, the overall avalanche danger remains LOW for all aspects and elevations. We received no new snow over this past week with predominantly moderate northwest winds. Instabilities are unlikely and will be limited to areas of wind loading near ridgetops, bowls, rock outcrops, chutes and gullies on all aspects and on slopes steeper than 35 degrees. Most other areas have been scoured down to the old, firm snow surface and/or entered a melt/freeze cycle. Normal caution advised.

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March 1, 2013 at 6:55 am

For today, the overall avalanche danger remains LOW. We received no new snow over this past week with predominantly moderate northwest winds. Instabilities are unlikely and will be limited to areas of wind loading near ridgetops, bowls, rock outcrops, chutes and gullies on all aspects and on slopes steeper than 35 degrees.  Most other areas have been scoured down to the old, firm snow surface and/or entered a melt/freeze cycle.

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February 24, 2013 at 7:15 am

For today, the overall avalanche danger remains LOW with pockets of MODERATE danger where wind slabs are present. We received 5-7 inches of new snow over this past week with moderate to strong winds from various directions. Instabilities will be limited to areas of wind loading near ridgetops, bowls, rock outcrops, chutes and gullies. Winds have primarily blown from the northwest, however periods of wind from other directions have occurred. Be cautious of wind slabs on all aspects and on slopes steeper than 35 degrees.  Most other areas have been scoured down to the old, firm snow surface.

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February 23, 2013 at 7:03 am

A variety of snow conditions exist today in the forecast area. Overall low with pockets of moderate avalanche danger. We received 4-6 inches of new snow over the week with strong winds from various directions.We received up to an inch in the last 24 hours. While some areas have been scoured down to old snow surface by winds in the past several days, instabilities will be found in isolated wind loaded areas near ridgetops, bowls, rock outcrops, chutes and gullies.

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February 22, 2013 at 6:57 am

A variety of snow conditions exist today in the forecast area. Overall low to moderate avalanche danger prevails. We received 4-6 inches of new snow over the week with strong winds from various directions. While some areas have been scoured down to old snow surface by winds in the past several days, instabilities will be found in isolated wind loaded areas near ridgetops, bowls, rock outcrops, chutes and gullies

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February 17, 2013 at 8:04 am

Overall, avalanches are unlikely today in the forecast area. A variety of conditions will be found out there with most areas trending on the firm side. Wind slabs have bonded well to the widespread crust layer and are not a concern. A thick layer of facets still exists below our thick crust, however we do not have any slabs above this layer from our recent observations. With plentiful sunshine, any southerly aspect should warm nicely and any instability will be limited to roller balls during the warmest portion of the day. Other aspects will remain firm and funky!

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February 17, 2013 at 7:02 am

Overall, avalanches are unlikely today in the forecast area. A variety of conditions will can be found out there with most areas trending on the firm side. Wind slabs have bonded well to the widespread crust layer and are not a concern. A thick layer of facets still exists below our thick crust, however we do not have any slabs above this layer from our observations. With plentiful sunshine, any southerly aspect should warm nicely and any instability will be limited to roller balls during the warmest portion of the day. Other aspects will remain firm and funky!

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February 16, 2013 at 1:34 am

Overall, avalanches are unlikely today in the forecast area. A variety of conditions will can be found out there with most areas trending on the firm side. Wind slabs have bonded well to the widespread crust layer and are not a concern. A thick layer of facets still exists below our thick crust, however we do not have any slabs above this layer from our observations. With plentiful sunshine, any southerly aspect should warm nicely and any instability will be limited to roller balls during the warmest portion of the day. Other aspects from the top 180 degrees of the compass will remain firm and funky!

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