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Una tromba d'acqua si è formata sabato mattina verso le 10 sul Lago di Zurigo. Rispetto a un tornado come quelli che si verificano negli Stati Uniti, la velocità del vento era molto più bassa. Il fenomeno, spiegano i meteorologi di Schweizer Radio und Fernsehen (SRF), è stato determinato dalla presenza di una massa d’aria relativamente fredda (13 gradi) sull’acqua più calda (22 gradi) del lago.
Si tratta di un episodio non frequente ma meno raro di quanto si creda che può verificarsi durante o alla fine dell’estate quando vi è una differenza marcata tra le temperature dell’acqua e dell’aria. L’ultimo simile risaliva al 21 luglio 2012. La tromba non può avanzare sulla terra ferma perché la bassa temperatura del suolo la priva dell'energia necessaria.
ats/mas
Dal TG20 del
05.09.2015: Inconsueta tromba d'acqua a Zurigo
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