The snowdrift accumulations generated over the last 3 days are the major danger.
As a result of fresh snowfall and strong-to-storm strength winds from varying directions, trigger-sensitive snowdrift accumulations have been generated since Friday, particularly in gullies, bowls and behind protruberances in the landscape. These can be triggered by one single skier in all aspects above 2200m. Due to winds the drifted masses will continue to grow further.
Avalanche headquarters have little information from high alpine regions. For that reason, the situation must be cautiously evaluated on-site. Apart from the risks of being buried in snow masses, the danger of being swept along and forced to take a fall need to be taken into consideration.
Snowpack
dp.6: cold, loose snow and wind dp.1: deep persistent weak layer
From place to place, 30-40 cm of snowfall has fallen above 2200m since Friday. Often strong-velocity winds have covered the fresh fallen snow. Freshly generated snowdrift accumulations are poorly bonded with each other and with the old snow. The upper layers of the snowpack are soft; the lower layers are faceted.
There is still little snow on the ground at all altitudes for this juncture of the season. The snowpack is highly irregular, even over small areas.
Avalanche danger above 1800m is moderate, danger is low below that altitude. Fresh and older snowdrifts are the major problem, these can trigger a small-to-medium sized slab avalanche by minimum additional loading in some places. They are blanketed by just a bit of fresh snow, making them hard to recognize. Danger zones occur near to ridgelines, in all aspects and in wind-loaded gullies and bowls. Frequency of avalanche prone locations tends to increase with ascending altitudes.
Snowpack
Winds from varying directions have generated snowdrift accumulations over the last few days. In some places there are trigger-sensitive intermediate layers evident. The last cm of fresh fallen snow on Monday fell without much wind. At high altitudes of the Allgau Alps on sites where the snow is shallow, there is a layer of facted crystals beneath a thin melt-freeze crust in the old snowpack. The old snowpack at high and high alpine altitudes is marked by wind influence. Snow depths vary a great deal.
Tendency
Avalanche danger levels are expected to slowly recede.
Danger level
1800m
Avalanche Problem
Wind slab
1800m
Snowpack
Tendency
Danger level
2000m
Avalanche Problem
Wind slab
2000m
With increasing altitude, snowdrifts demand caution
At higher altitudes the freshly-generated and older snowdrift accumulations are prone to triggering in some places, easily triggered as small-sized, in isolated cases as medium sized slab avalanches. Danger zones occur behind protruberances in the landscape, in gullies and bowls, and on freshly wind-loaded slopes. Magnitude and spread tend to increase with ascending altitude. Avalanche headquarters currently has little data from outlying regions about the snowpack, for that reason a cautious on-site evaluation is important. Below the treeline, avalanche danger is low. Isolated danger zone for small triggerings (slides) are possible in steep terrain. The risks of being swept along and forced to take a fall need to be considered.
Snowpack
The latest round of fresh snowfall was deposited atop a well consolidated old snowpack surface showing marked effect from the wind. Knolls and ridges are often totally windblown or have only a bit of fresh snow, gullies and bowls have noticeably more snow. With increasing altitude, particularly in pass and ridgeline areas, mostly small-to-medium snowdrift accumulations are evident. They are only moderate well bonded to the old snowpack surface, making them often prone to triggering.
Tendency
Currently, no significant change is expected.
Danger level
2000m
Avalanche Problem
Wind slab
2000m
Caution: older drift snow in higher alpine regions, especially in gullies and bowls with old snowpacks.
The Avalanche danger above around 2.000 m AMSL is moderate, below 2.000 m AMSL: low. Stormy winds from west to northwest cleared out exposed slopes but drifted snow towards gullies and bowls behind ridgelines. Snowdirftpacks tend to be prone to triggering, possible with bigger additional load. Danger spots are hardly visible due to new snowpack layers. Small to medium slab avalanches are possible.
Snowpack
The amount of new snow from Saturday is about 50 cm. The snow got on bare soils, fresh snow drift in gullies and bowls in highe shady slopes got on bonded snow from the last Novemberdays which transformed to facetted snow crystals. The bonding is weak. Little amounts of freshly fallen snow since Saturday causing hidden danger spots.
Tendency
Decreasing wind slab problem.
Danger level
2100m
Avalanche Problem
Wind slab
2100m
New snow
2100m
At high and high-alpine altitudes, ridgeline snowdrifts demand caution.
Avalanche danger as of 2100m is moderate, danger is low below that altitude. Near ridgelines at high and high-alpine altitudes there are shallow drifts behind protruberances in the landscape behind ridges. Generally, large addtional loading is necessary to trigger a small-sized slab avalanche in steep terrain. In steep rocky terrain, due to solar radiation, small loose-snow avalanches can trigger, medium-sized ones in regions where there has been heavy snowfall.
Snowpack
Loosely-packed fresh fallen snow lies deposited on last week’s snowpack surface (of snowdrifts and compacted snow). At high and high-alpine altitudes the NE winds can transport the snow to ridgelines. At high and high-alpine altitudes the September snow has persisted and now serves as a compact base. Transition zones from the September snow to the November snow contain faceted crystals in isolated cases, these could serve as a fracture surface. The snow is distributed highly irregularly, ridges broad and narrow are often completely windblown, and even in other places the fresh fallen snow insufficiently blankets the snow base.
Tendency
Danger is expected to gradually recede.
Danger level
Avalanche Problem
Wind slab
Snowpack
Tendency
Danger level
Avalanche Problem
Wind slab
Snowpack
Tendency
Danger level
Avalanche Problem
New snow
Small-sized loosely-packed snow avalanches are possible.
Avalanche danger is low. In extremely steep terrain, small-sized loose snow avalanches can release due to solar radiation. In isolated cases near ridgelines, there are freshly generated snowdrift masses which can, however, only trigger a slab avalanche in general by large additional loading.
Snowpack
Loosely-packed fresh fallen snow lies deposited atop a well settled and consolidated base or on bare ground. The snowpack is not sufficiently thick in all places for snow sports in outlying terrain.
Tendency
Danger expected to remain constant
Danger level
Avalanche Problem
Wind slab
Small Danger zones due to snow drifts
A few danger spots caused by freshly fallen drift snow layers on old snow packs from the last Novemberdays are located in shady slopes. Slab avalanches can only be triggered by higher additional loads. The scale of such avalanches would be small (sluff).
Snowpack
South of the Alps few snow, expected snowfall during the night predominately north of the Alps. Precipitations from the Italian low pressure system are expected only on the edges of the southern Alps with little amounts of snow and only few winds.
Tendency
No significant changes of the avalanche danger.
Danger level
treeline
Avalanche Problem
Wind slab
Treeline
Caution urged towards small-sized snowdrifts
Above the treeline, fresh, mostly small snowdrift accumulations require caution. Isolated danger zones for small avalanche triggerings (slides) in steep terrain and freshly wind-loaded slopes are possible. Avalanche headquarters currently has little data from outlying regions about the snowpack, for that reason a cautious on-site evaluation is important. Below the treeline, no marked avalanche problem is evident.
Snowpack
The latest round of fresh snowfall was deposited atop a well consolidated old snowpack surface showing marked effect from the wind. Knolls and ridges are often totally windblown or have only a bit of fresh snow, gullies and bowls have noticeably more snow. With increasing altitude, particularly in pass and ridgeline areas, mostly small-to-medium snowdrift accumulations are evident.
Tendency
Currently no significant change is expected.
Danger level
Avalanche Problem
Wind slab
Low avalanche danger
Avalanche danger is low, in isolated cases small drifts can trigger small sized slab avalanches by minimum addtional loading, e.g. the weight of one single skier. Danger zones occur particularly in steep terrain near ridgelines on S/W/N facing slopes and in wind-loaded gullies and bowls. They are covered by a small amount of fresh snow, thus are difficult to recognize. The risks of being forced to take a fall outweigh those of being buried in snow masses.
Snowpack
Small snowdrift accumulations generated on Monday are now covered by a few cm of fresh fallen snow. Older drifted masses are mostly well bonded, unlikely to trigger. The old snowpack at high altitudes shows marked signs of wind influence, is thus highly irregular.
Tendency
Little change in avalanche danger levels is anticipated.
