Altocumulus lacunosus over Holy Ghost, San Miguel, New Mexico, US.

When Clouds Raise an Eyebrow

Edward Graham, editor of Weather, and Gavin Pretor-Pinney (Member 001), wrote the article “When Clouds Raise an Eyebrow – the case for a new supplementary cloud feature ‘Supercilium‘” to celebrate 250 years since the birth of Luke Howard.  Supercilium are short-lived cloud features, which appear in turbulent airflow over, and to the immediate lee of, steep mountain peaks during periods of strong mountain summit level winds.  The image shown here was used as our March 2022 Cloud of the Month.

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