278
A. Pellegrini et al.
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
Fig. 7. Frequency of occurrence of wind speed between 8 and 14 ms1 at AWS 7350
According to [9], 'drifting snow' indicates masses of fine snow particles carried
by the wind only in the lowest layer above the surface, so that the horizontal visibility at the height of the observer's head is not impaired. When the wind velocity increases above a threshold, which dépends on the nature of the snow surface
A. Pellegrini et al.
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
Fig. 7. Frequency of occurrence of wind speed between 8 and 14 ms1 at AWS 7350
According to [9], 'drifting snow' indicates masses of fine snow particles carried
by the wind only in the lowest layer above the surface, so that the horizontal visibility at the height of the observer's head is not impaired. When the wind velocity increases above a threshold, which dépends on the nature of the snow surface