Bats in the mist – dusk at Downe, Keston and Polhill

Exceptionally mild temperatures have lured bats out into the autumnal gloaming to catch late flying insects. I love watching these animals swoop, flutter and flit around and it’s a bonus to see them so late in the year. Usually you can only pick them out against the sky but at Downe and Keston on last weekend’s strolls I was buzzed by bats so closely I sensed rather than saw them zooming past. Yesterday at Polhill one or two emerged from the mist to pass close over our heads before vanishing into the gloom.

I’d thought we’d set off rather too late for a walk. Traffic was bad on the A21 slowing us further (the train is by far the best option for Shoreham walks) and low cloud had covered the sky. But by Locksbottom the skies cleared and we were bathed in a beautiful golden light. This was a false dawn: by the time we parked up by Meenfield Woods above Shoreham we were in quite dense fog. This magically cleared at Polhill, the walk’s halfway point, to give us unusual views before swirling back in as the sun set. With the mist below we had the feeling we were much higher above the valley than we were. I think this weather effect is called a temperature inversion, where warmer air passes over the relatively cold air on the valley floor, causing condensation.

By the time we finished the walk, visibility was down to about 50 metres and driving home the twisty, twiny country lanes needed total concentration if we were to avoid a close encounter with a hedgerow.

  • Mist obscures Sevenoaks
  • Mist at Polhill looking towards Otford, November 2022
  • Mist at Polhill looking towards Otford, November 2022

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