Monday, January 14, 2013

frost tricks

the magical frost sticks are back (see previous pages and this link). This was a surprising find because it has not been that cold and there was no frost on the ground at all. The ice crystals must be the product of an unusual combination of air temperature and saturated vapour pressure in the still air of the sheltered river valleys. The picture below shows butterbur beginning to flower, this is very early indeed based on past years at this spot where it normally comes intop flower towards the end of February. The  ground has been scoured clean by the floods over the Christmas period. It may be that that butterbur likes a good soaking. At this point where the Inny runs into the Tamar the flood waters can reach 3 or 4 meters above normal, and very large trunks etc can be found well above river level. The volume of water involved in these floods is massive.

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