Forecast valid for Wednesday 3 July 2019 from 06:00 to 23:59 utc

One more unpredictable day but with high potential, with the possibility of forming strong thunderstorms, gusts of wind and hailstorms.
A very mild wave cable will in fact pass through northern Italy during the afternoon / evening.

The slightest drop in geopotentials combined with vorticity injection will result in the formation of multicellular storms and given the energy involved (peaks of 3000J / kg) also MCS (Mesoscale convective system).

The MCS are a mass of multicells with a duration of at least 3 hours, an extension of more than 150km and with top of the cloud that must reach certain temperature values.

Initially a very strong cap will be present on the plain but analyzing the theta e at 850hpa (about 1500m) and the curvature at 700hpa (about 3000m) it seems very probable the explosion of the convection that will literally blow up this cap.

Valle d'Aosta and Piedmont

Phenomena in formation during the afternoon hours on Alpine and Apennine reliefs. The most intense thunderstorms could hit the lower Piedmont on the border with Liguria with hailstorms and gusts of wind. Elsewhere more sporadic phenomena. Possible trespassing between Genovesato and Savonese but with phenomena of the most weak intensity

Veneto, Lombardy and Emilia Romagna

Some phenomena will be present on the upper Veneto already in the morning but the highlight of the phenomena will be between afternoon and evening.

The areas within level 2 will be those that will risk the most, with the possibility of Mcs (mesoscale convective system) and annexed hail of medium large dimensions and gusts of wind (downburst), with an intensity even higher than 100km / h.

The motion of thunderstorms will be random and guided by the winds of outflow (cold wind coming out of thunderstorms) but tend to tend to move from west to east.
Beware of hail which in some cases may exceed 4 cm in diameter.

Friuli and Trentino Alto Adige

Still under observation the alpine area with some phenomenon already in the morning and subsequently also during the afternoon, hail and very high rain rates with local inconveniences are not excluded.

Attention for those who practice mountain tours.

Jacopo Zannoni

The member of the storm chasers group ZenaStormChaser from Genoa, Italy. Follow ZenaStormChaser on Facebook, Instagram or Twitter