Most of the avalanches hit the western Tyrol region and Friday alone saw five fatalities, rescue services said.
That day, four Swedish skiers and their Austrian tour guide – all in their 40s – were killed when a 400-metre-wide avalanche, near the town of Spiss on the Swiss border, buried them, Austrian broadcaster Orf said.
A sixth member of their group was only partially buried by the snow and was able to phone for help. He was airlifted to hospital with injuries.
Also Friday, a man aged 60 and his wife of 61 were engulfed while cross-country skiing near the village of Auffach, Tyrol police said.
Saturday then saw a 58-year-old Austrian killed at Schmirn near Innsbruck in an avalanche which injured four others, Austrian broadcaster Orf reported.
Further west, an experienced skier of 43 was killed in the popular Vorarlberg region as Austria saw exceptional quantities of snow fall going into and across the weekend.
Five winter sports enthusiasts were buried by snowfall in the major resort of Soelden but were all rescued.
“The past three days have seen some 100 avalanche-type incidents requiring 70 interventions,” Tyrol regional authorities said Sunday, dubbing the situation “unprecedented” and warning of more to come.
The region’s avalanche warning service (Lavinenwarndienst), which closely examines avalanche cones (the mass deposited where an avalanche has fallen) and where they break off, said that there was still “considerable avalanche danger” on Sunday, with further snow forecast for Monday.
The risk level for the region – in orange in the above map from the service – stood at three on a five-point scale on Sunday.
Artificially triggered avalanches and stability tests on the structure of the snow cover confirmed the delicate avalanche situation in the region.
Fresh snow and snowdrifts had fallen on weak old snow, making the structure particularly unfavourable, the service explained, adding that weak layers in old snow can be difficult to recognise.
Booming noises and cracks when stepping on a snowpack are clear signs of a weak structure.
Anyone who skis off the secured pistes needs to be an expert at avalanche assessment, Rudi Mair, head of the avalanche warning service, told Orf.
Recent years have seen avalanches claim around 20 lives a year in Austria, fewer over the past two years after the pandemic vastly reduced skier numbers.