Avalanche Bulletin Sunday, 23.04.2017, at 07:30

dangerlevelmap

WHAT?

problem

WHERE?

danger spots

drifting snow

drifting snow

danger spots above 2800m problem 1 aspects

fresh, trigger-sensitive

wet snow

wet snow

danger spots below 2800m problem 2 aspects

radiation, daytime warmth

General Level

Tirol

generallevel

Tendency

tomorrow

tendency

constant

R1 Arlberg Außerfern
R2 Westliche Nordalpen
R3 Östliche Nordalpen
R4 Silvretta - Samnaun
R5 Nördl. Ötztaler & Stubaier Alpen
R6 Tuxer Alpen
R7 Kitzbüheler Alpen
R8 Südl. Ötztaler & Stubaier Alpen
R9   Zillertaler Alpen
R10 Osttiroler Tauern
R11 Zentral-Osttirol
R12 Südliches Osttirol
1
low
2
moderate
3
considerable
4
high
5
very high
© LWD Tirol | IfGR UNI Wien | DVT

WHY? - danger patterns (dp):

dp.6 - loose snow and wind
dp.10 - springtime szenario
dp.2 - gliding snow

Moderate danger widespread, considerable danger in some high alpine regions

Avalanche Danger

Avalanche danger in Tirol’s backcountry touring regions is predominantly moderate. Above 2800m, danger is still considerable (at lower edge) from region to region. Danger zones for dry-snow slab avalanches are found on shady, steep slopes and in ridgeline terrain above 2800m. Freshly formed snowdrift accumulations are generally small, but often brittle, due to low temperatures, and thus, prone to triggering, even by minimum additional loading. During the day the snowpack loses its firmness below 2800m, making extra caution essential. As of that point, the risk of naturally triggered moist slides, wet-snow and gliding avalanches increases, particularly on E-S-W facing slopes.

Bild 2017-04-23_0730_en

Snow Layering

Last night in Ausserfern, along the Northern Alps, in the Kitzbühel and Zillertal Alps and on the Tauern Ridge, there was 10-15 cm of fresh fallen snow registered. In the remaining regions of North and East Tirol, less. The snowfall level dropped to nearly 1500m.Strong NW winds were blowing, again transporting the snow and giving rise to new snowdrift accumulations. These are small-sized, but brittle because of the cold, and thus, trigger-sensitive. During the day, intense solar radiation and daytime warming will cause the snowpack to forfeit its firmness, particularly in western regions of North Tirol.

Alpine Weather Forecast (ZAMG-Weather Service Innsbruck)

Weather: A NW air current first brought a cold front,today brings drier air masses our way, air pressure is rising. Mild air will reach us on Monday, an interim high-pressure front. On Tuesday, a SW air current will reach us. On Wednesday, conditions will shift, a low will bring heavy precipitation and late-winterlike weather. Mountain weather today: The cold front brought a few cm of snow to the northern flank of the Alps (above 1500m). Conditions will improve during the course of the day today from the west, the Kitzbühel Alps will remain overcast for longer. South of the Main Alpine Ridge, strong northerly winds and sunshine. At 2000m: -5 to -2 degrees; at 3000m: -12 to -7 degrees. Strong W/NW winds to start with, tapering off during the day.

Short Term Development

Daytime increase in avalanche danger

[Author: Rudi Mair]

[Translated by Jeffrey McCabe]