Avalanche Forecast Bulletin
for Monday, 23.04.2018
(published: , 22.04.2018 at 4:18 pm)
german version
Wet-snow, gliding-snow threat. Terminate backcountry tours early!
Avalanche Danger
The daytime danger curve currently has only a slight effect on danger levels. Due to insufficient nocturnal outgoing radiation of the snowpack, danger is moderate already in the early morning hours, then rises to considerable over the course of the morning. On steep slopes in all aspects, wet-snow and gliding-snow avalanches can trigger naturally at any time. Due to the unusual snow depths this winter, the releases can grow to dangerously large size, plummet down over bare slopes at lower altitudes and cover them with snow anew. Gliding cracks visible on the snowpack surface are indications of imminent danger. Also cornices are becoming increasingly unstable, can break spontaneously at any time.
Snow Layering
Warm weather has melted a great deal of snow over the last few days. A superficial crust capable of bearing loads was able to form only on extremely steep, shady slopes at high altitude; everywhere else, soft, slushy snow dominated, with sink-in depths often down to the ground. At intermediate altitudes the snowpack is also becoming thoroughly wet, isotherm in all aspects down to the ground to an increasing degree. The snowmelt water forms a pronounced weak layer inside the snowpack, encouraging wet-snow and gliding-snow avalanches.
Alpine Weather Forecast
On Monday morning it will still be sunny. Starting at midday, a perturbance will move in from the northwest, showers will become frequent in the afternoon. In the evening, the showers will spread out further from northern Upper Styria. The summertime temperatures will still be high: at 2000 m, +9 degrees; at 1500 m 14 degrees. Winds will strengthen as the rain sets in.
Short Term Development
After the perturbance has withdrawn, rain showers can still be expected on Tuesday morning. Thereafter the clouds will rapidly disperse and it will gradually turn quite sunny. Temperature at 2000 m: +3 to +6 degrees. As the warmth returns, little is expected to change in the avalanche situation. The wet-snow and gliding-snow threat will remain in the forefront of the daytime risks, all the way up to high altitudes.

The next avalanche bulletin will be published on Monday at about 6:00 pm.
Alexander Podesser
Translated by Jeffrey McCabe, www.creativtrans.com