More sun and good views
21st December 2021
High pressure conditions continue with sunshine and warm temperatures on the summits and cloud and below freezing temperatures at lower levels. The snow remains very firm in all locations. This is due to a process called radiative cooling which occurs when you have clear skies overnight combined with light winds and causes the temperature of the snow surface to decrease significantly. Today I recorded an air temperature of 3.1C and a snow surface temperature of -5.9C in the same location (at 1065m).

Surface hoar crystals that have grown on the snow surface due to the cold clear conditions. These aren’t a problem themselves but can form a weak layer when windslab forms on top of them.
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