Weather: 7 TORNADO to the NORTH, IT WAS NEVER SUCCESS! We explain why it HAPPENED and the RISK MAP in ITALY
Sunday 19 September: 7 tornadoes hit Northern ItalyThe one of Sunday 19 September it was a historic day from a meteorological point of view: it had never happened, in fact, that they were registered well 7 tornado in a single day on the Po Valley, but probably not even on the whole Italian territory.
But how did this happen?
Let’s go in order trying to understand the atmospheric dynamics of what happened, identifying then also the most a risk for Italy with the help of an updated map.
It was a very turbulent afternoon in Lombardy on Sunday 19th September. Everything was caused by theentry of a cold front in descent from Northern Europe, propelled and continually powered by polar currents that have gone to interact with the heat still present in the lower layers of the atmosphere: overall they are 7 and tornado that have formed between Lombardy and Emilia Romagna, causing massive damage to homes and infrastructure, as we can see in this VIDEO quite emblematic.
Among the affected localities we find: Seventh Milanese (ME), snoring (PV), Pallasian Court (IT), Soresina (CR), Pontevico (BS), Manerbio (BS) e Carpi (MO).
But how do tornadoes arise? To be able to trigger there is a need for several ingrediants: warm-humid air in the lower layers of the atmosphere, cold and even dry air at medium-high altitudes, high altitude jet stream e strong wind variation (Windshear, in technical terms) with the share.
All this, put together, can generate an explosive recipe, triggering the classics vertically developing clouds thunderstorm type, i cumulonimbus.
In particular, those formed on Sunday were the fearsome supercelle, the most dangerous and violent. To measure the strength of these events we use the “Fujita scale “, or an empirical measure ofintensity of a tornado according to the damage inflicted on man-made structures: da F0 (small tornadoes) up to F5 (the most destructive with winds up to over 400 km / h).
In our country, tornadoes have already reached a respectable intensity in the past: to remember the most powerful ever recorded, in 1970 in Veneto, with power F5, the maximum, or the F3 ad Arcore (MB), in 2001 it’s at Dolo (VE), in 2015.
But be careful because these events in the future they could be more and more intense, destructive and frequent.
As we have already had the opportunity to remember, in fact, the increase in temperatures resulting from the climate change in progress often translates into one higher potential energy involved (high humidity levels in the lower layers of the atmosphere), that is, the fuel needed for it development of particularly violent thunderstorms. For this reason we are witnessing a also increased frequency of tornadoes in Italy and what happened on Sunday risks becoming an omen for what could happen in the future.
AREAS AT RISK IN ITALY. Our country is particularly at risk of extreme weather phenomena, but there are some areas that are more exposed than others (map attached). Whole Val Padana it is particularly threatened, with a moderately moderate risk, but be careful because it rises above all on the Veneto and on the Lombardy: the latter two regions, in fact, are particularly subject to tornadoes (O tornado if you prefer, they are in fact synonyms and indicate the same phenomenon) which also in the recent past have caused considerable damage. Pure the Salento it is a high risk area. Moderate danger then also for Lazio, Tuscany e Sicily, while on the rest of the country, while it is not possible to completely exclude that these phenomena may occur, the probabilities are much less high.
Tornado risk map in ItalyTornado in Carpenedolo (BS) (source: Cristian Papididuemeraviglie Pinto)Tornado to Roncaro (PV) (source: Cinthya Cornejo Carlo)Tornado in the Lodi area (source: Fire Brigade)