Avalanche Bulletin
for , 20.04.2020
(published: Monday, 20.04.2020 at 4:30 pm)
german version
Final Avalanche Bulletin of the season. Daytime avalanche danger cycle: in the foreground are wet-snow and glide-snow threats.
Avalanche Danger
Due to the COVID-19 crisis the Avalanche Bulletin addresses only potential dangers to infrastructure and settlements, not conditions for backcountry skiing tours. A daytime danger cycle lies behind the current pattern of events, causing avalanche danger to rise from low to moderate during the course of the day. The snowpack tends to regain firmness during the night, subsequently forfeit it swiftly during the morning hours. Thereafter, wet-snow and glide-snow avalanches which can trigger naturally require attentiveness. Releases are possible in all aspects, however are most frequent on east-to-south-to-west facing slopes, in accordance with the course of the path of the sun across the sky. In isolated cases, forest trails, lumbering roads and hiking paths can be endangered by these avalanches. Otherwise, no perils threaten settlements or infrastructure.
Snow Layering
Daytime warming coupled with frequently cloudless skies brings intensive solar radiation in its wake. This rapidly deteriorates the snowpack firmness regained during clear nights of outgoing longwave radiation. It destabilizes the snowpack and encourages wet-snow avalanches to trigger naturally on steep slopes. A lubricating layer at ground level reduces friction between snow and ground, thereby enhancing gliding snow masses over grass-covered slopes and smooth rock slabs. During a phase of high-pressure weather conditions, the slopes are swiftly becoming bare of snow, and the below-average snow depths are being further decimated.
Alpine Weather Forecast
This week will be largely under the influence of high-pressure weather including great amounts of sunshine, isolated cloudbanks will be the exception. Temperatures at 1500 m will lie at 8-10 degrees; at 2000 m at 4-5 degrees. Winds will be blowing at light to moderate strength from mostly easterly to southeasterly directions, intermittently stronger at summit level.
Short Term Development
Due to the comparatively tranquil weather conditions, the avalanche situation is not expected to change significantly. A daytime danger cycle continues to be operative, making attentiveness towards wet-snow and glide-snow avalanches imperative. Unless the avalanche situation undergoes a major change, this is the final bulletin of the season.

The Avalanche Warning Service of Styria hereby closes its portals for the season and retires to the summer interim. This is the final bulletin of the season.
Andreas Riegler
Translated by Jeffrey McCabe, www.creativtrans.com