W H AT IS THE HELM WIND?

Country Walking Magazine (UK) - - Discover -

Bri­tain’s only named wind is what me­te­o­rol­o­gists call a ‘foehn’. This lo­calised phe­nom­e­non oc­curs when a pre­vail­ing north­east­erly roars over the down-slope of the North Pen­nines. Cool­ing air forms a cap of cloud along the crest known as the ‘Helm’ – so called be­cause it re­sem­bles a hel­met. As the cold air rushes down and rat­tles through the vil­lages in the valley, it meets warmer air and rises again to form a tubu­lar, rolling cloud called the ‘Helm Bar.’ The two par­al­lel clouds are sep­a­rated by clear skies.

Wil­liam Mar­riott’s 1886 di­a­gram of the Helm Wind.

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