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).

Looking to the Shelterstone and Garbh Uisge-Beag with Ben Macdui behind

Looking at the South side of Cairngorm, which is the side of Cairngorm holding most snow just now.

Looking across to Beinn Mheadhoin from Stac an Faraidh.

Coire an t-Sneachda

2 layers of cloud in the temperature inversion this morning.

Above the higher cloud band shown in the previous photo. Looking at Meall a’ Bhuachaille.

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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