18th March 2007
Lots of graupel (sometimes called soft hail) fell on the hill today. The picture shows some of this graupel on a snow card. The grid in the centre is 2mm. Graupel is formed by the heavy riming of particles by accretion of supercooled water. When buried by additional snow fall it can create instabilities by acting like a layer of ball bearings. With snow showers forecast for the next few days this is likely to occur.
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