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Una densa nube di pulviscolo proveniente dal nord Africa ha raggiunto giovedì il nord dei Grigioni. Dopo la notte tropicale, con temperature che grazie al favonio non sono scese sotto i 20 gradi in molte località, ora è la sabbia sahariana ad avvolgere la valle del Reno, tingendo di giallo anche l'ultima neve rimasta in quota. Nulla di straordinario, assicura Meteosvizzera, sottolineando però che in queste dimensioni il fenomeno è abbastanza raro. Venerdì, con la cessazione dei venti, la polvere nordafricana verrà spazzata via dalla pioggia.
Mirko Priuli
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