Avalanche Forecast Bulletin
for Monday, 24.04.2017
(published: , 23.04.2017 at 4:36 pm)
german version
Some trigger-sensitive snowdrifts at high altitudes, snowpack swiftly losing firmness during daytime, snowpack becoming thoroughly wet
Avalanche Danger
In the Northern Alps and the northern sector of the Niedere Tauern, considerable avalanche danger prevails above 1600 m; in the other regions of Styria, danger is moderate to low. At high altitudes, isolated, older snowdrift accumulations and especially the drifts which amassed on Saturday and Sunday require special caution; in terrain adjacent to ridgelines they can often be triggered by one sole skier or freerider. As solar radiation intensifies and daytime warming rapidly increases, wet-snow and gliding avalanches will come into the foreground of danger, particularly at lower altitudes. Naturally triggered moist-snow and loosely-packed avalanches are also possible in steep terrain. The numerous glide cracks in the snowpack surface are indicators of gliding avalanche danger which call for caution.
Snow Layering
On Saturday night there was up to 30 cm of fresh fallen snow registered in the Northern Alps; in the Niedere Tauern up to 10 cm. The snowfall level was often the valley floor. At lower altitudes the new fallen snow was able to settle during the daytime. At high altitudes, fresh snowdrifts accumulated anew which were deposited atop older drifts and are thus prone to triggering. The mild and sunny weather on Monday will help the fresh snow to settle further. The process of the snowpack becoming moist and ultimately, thoroughly wet, is continuing. This, in turn, eliminates all firmness inside the snow cover. The warm ground serves as the perfect lubrifying layer for gliding avalanches, indicated by the appearance of glide cracks in the snowpack surface. Low altitude terrain is rapidly becoming bare of snow.
Alpine Weather Forecast
On Sunday night, partly cloudy skies. On Monday, following a frosty start, a southwesterly air current will bring sunshine and warmer air masses, including an upward leap in temperature at all altitudes. At 1500m: +6 degrees; at 2000m: +2 degrees. Light-to-moderate SW winds will prevail.
Short Term Development
On Tuesday, pleasant weather conditions are expected, with potential for cloud but milder temperatures. The snowpack will continue to settle and also become wetter. This will catapult the wet-snow problem into the limelight.

The next avalanche bulletin will be published tomorrow at about 6:00 pm.
Gernot Zenkl
Translated by Jeffrey McCabe, www.creativtrans.com