Strange dome of fog over the valley.

Met Office and BBC Weather Centre Forecaster John West shares with us his thoughts on what could be causing this effect.

fog in wales

“This is a very unusual phenomenon, but the most likely explanation is that the “fog dome” has been caused by a source of heat close to the ground, possibly an agricultural building or a relatively warm pool of water. As the fog has formed in the valley this heat source has forced the fog to lift away from the ground into a dome as warmer air rises; like a hot air balloon.”

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It is an unusual phenomenon, as if something had disappeared in the fog.

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