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L’anticiclone che ha determinato l’attuale ondata di caldo si sta indebolendo lentamente permettendo a una perturbazione temporalesca di attraversare le Alpi fra venerdì e sabato, come ha comunicato MeteoSvizzera. Questa porterà un primo ricambio d’aria e una diminuzione delle temperature anche sul versante sudalpino. Si prevede di conseguenza di terminare l’allerta canicola di livello 4 nel corso di venerdì.
Quello appena trascorso è stato definito come uno dei periodi più caldi mai registrati al Sud delle Alpi da 150 anni a questa parte.
Sotto la lente non ci sono solo le alte temperature, il valore massimo di 36.8 C. è stato registrato il 22 luglio a Locarno-Monti, ma anche la durata eccezionale, con una sequenza lunga di giornate "bollenti". Dal 14 luglio le temperature sono state tra 4 e 6 gradi sopra il valore normale per il mese corrente.
Red.MM/sdr
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