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Lascia senza fiato il tramonto a cui si è potuto assistere domenica sera nei cieli della Svizzera italiana e non solo. Uno spettacolo straordinario e romantico che scientificamente si deve a nuvole chiamate in gergo tecnico lenticolari, ci ha spiegato il meteorologo Marco Gaia. Si formano in quota in presenza di vento, in questo caso da nord. L'aria salita per scavalcare le Alpi ha formato delle ondulazioni che hanno permesso questa conformazione.
Il cielo in fiamme
L'altro ingrediente era costituito dal sole calante, i cui raggi hanno illuminato le nuvole dal basso. Non c'entra invece nulla l'inquinamento dell'aria di questi ultimi giorni, che riguarda quote molto più basse, mentre il fenomeno di domenica si è prodotto a diverse migliaia di metri dal suolo.
Il tramonto sul lago a Lugano in video
Pierre Pellegrini 29.10.2017, 20:01
pon
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