Analyse av værforhold ved utvalgte skredsituasjoner i Ørsta

Abstract

The meteorological phenomena of avalanches in Nivane, ørsta, Norway, for the period from 1960 to 1980 and for the years 1941 and 1942 have been analysed. We have analysed the meteorological phenomena of some situations which could possibly lead to an avalanche. The main reason for avalanches in Nivane, ørsta, seems to be strong winds from the NW combined with intense snow fa11, corresponding to a precipitation of 75 - 100 mm during the last 3 days before the avalanche. When cold periods precede the avalanche condition only a minor quantity of new snowfall is necessary to release an avalanche. In such situations the wind direction is not so decisive for the relase of an avalanche.