Caldo afoso e forti nubifragi, come cambia il meteo: le previsioni

Non solo caldo afoso con picchi record. Con l’arrivo di agosto ecco arrivare anche i primi, forti, temporali al Nord. Già nelle prossime ore, spazio quindi a nubifragi e maltempo che colpiranno soprattutto in Piemonte, Emilia Romagna e Lombardia. Ma le temperature, purtroppo, resteranno comunque elevate. Queste le previsioni meteo degli esperti per la giornata di oggi, 31 luglio, e i giorni a venire.

Temporali sparsi in arrivo, cosa dice l’esperto

L’Anticiclone Caronte inizia a scricchiolare al Nord e arrivano i primi temporali anche forti.. Lorenzo Tedici, meteorologo del sito www.iLMeteo.it, conferma che, soprattutto con l’inizio di agosto, il tempo cambierà al Nord.

Sono in arrivo dei forti temporali sparsi, i consueti rovesci violenti che si alternano alle lunghe fasi africane caldissime ed afosissime.

Come ben sappiamo, infatti, dopo una lunga fase in compagnia dell’anticiclone africano, sono sempre più frequenti i nubifragi e i violenti fenomeni temporaleschi a causa dell’accumulo di energia sotto forma di calore ed umidità: questa energia, poi, alimenta i fenomeni convettivi con la forte risalita verticale delle masse d’aria, ed ecco i temporali e anche la grandine.

In pratica, già nelle prossime ore, stante un primo leggero scricchiolio dell’anticiclone africano Caronte, aria più instabile da ovest causerà qualche acquazzone sulle Alpi e localmente anche sulla pianura padana, specie piemontese; non si escludono locali brevi rovesci anche tra Lombardia ed Emilia, ovviamente nelle ore pomeridiane, ore classiche per i temporali di calore; sul resto del Paese dominerà il sole con il caldo africano.

Le temperature resteranno infatti molto elevate con picchi di 43°C nella Sardegna interna, fino a 38°C a Firenze, Siracusa e Terni. Avremo anche 37°C a Bolzano (tanto calore e tanta energia per i temporali alpini), Catania, Ferrara, Forlì, Grosseto, Nuoro e Prato. La Capitale si fermerà a 36°C, una gran bella notizia dopo la sfilza insopportabile di 39-40°C degli ultimi giorni.

Il mese di agosto inizierà poi con altri temporali, ancora perlopiù confinati alle Alpi, ma con qualche rovescio pomeridiano sulle pianure del Triveneto.

Ma sarà soprattutto venerdì 2 agosto la giornata del forte ‘Break Temporalesco’, con fenomeni intensi al Nord e parte del Centro: dal primo pomeriggio si prevede il fiorire di numerosi ‘cavolfiori’, come vengono definiti i cumulonembi temporaleschi, data la loro forma.

I ‘cavolfiori’ scenderanno in modo diffuso dal settore alpino verso la Pianura Padana, un primo segnale di cedimento dell’anticiclone africano Caronte, con parziale coinvolgimento anche dell’Appennino settentrionale, dalla Toscana interna alle Marche settentrionali. Sono previsti rovesci e acquazzoni a macchia di leopardo al Nord e sui suddetti settori del Centro: attenzione alla grandine e ai downbursts, le raffiche di vento orizzontale ad oltre 100 km/h.

Doveroso ricordare, infine, che sempre venerdì registreremo ancora una giornata caldissima al Centro-Sud: Siracusa con 40°C, Bari e Foggia con 39°C, Ascoli Piceno, Catania, Lecce e Matera con 38°C dipingeranno una gran fetta dell’Italia di rosso fuoco, il rosso di un caldo ‘infernale’ senza fine.

Stiamo dunque per entrare (al Nord e su parte del Centro) in una classica fase ‘interafricana’, tra due fasi anticiclone dominanti; dal caldo afoso umido ed estremo passeremo ai temporali violenti, poi tornerà subito il caldo africano in questa lunga estate che sottolinea sempre più il nuovo clima subtropicale: caldo afoso, nubifragi e di nuovo caldo afoso opprimente, non un granché il nuovo ‘Clima del XXI secolo’.

Le previsioni nel dettaglio

Mercoledì 31. Al Nord: prevalenza di bel tempo, salvo temporali su Alpi e Prealpi. Al Centro: sempre sole e caldo. Al Sud: soleggiato e caldo.

Giovedì 1. Al Nord: temporali sul Triveneto, specie montuoso e poi su pianura friulana e veneta orientale. Al Centro: sole e punte di 38°C. Al Sud: tanto sole e tanto caldo.

Venerdì 2. Al Nord: temporali sparsi, specie sul Triveneto montuoso. Al Centro: sole e punte di 37°C. Al Sud: tanto sole e tanto caldo.

Tendenza: leggero calo termico, qualche rovescio al Centro.

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