The fly in the ointment

A beautiful sunny day across Scotland for the last day of 2019, but there’s a fly in the ointment across southern parts in the shape of a small upper vortex and a surface low of 1026 hPa just off the Brest peninsula at 12 UTC. The models seem to have been forecasting this feature for ages and is probably associated with a small cold pool that’s gradually warming out. It always seems to be the way with anticyclones over IONA recently, in that there’s either a frontal system running right through there heart, or some medium or upper level feature with a lot of cloud is embedded in it.

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