Italy's heatwave peaks with 14 cities on red alert as Scandinavian cool front brings relief and storms
After weeks of extreme heat, a Scandinavian trough will push temperatures down by up to 10°C across Italy starting Monday, triggering violent thunderstorms and ending the third heatwave of the summer.
Heatwave peaks with 14 cities on red alert
On Sunday 19 July, Italy's third severe heatwave of the summer reached its peak, with the health ministry placing 14 cities under the maximum level 3 red alert, indicating health risks for the entire population. The affected cities include Rome, Florence, Naples, Bari, Palermo, and others across the centre and south. Temperatures soared to 41-42°C in Puglia, Basilicata, Calabria, Sardinia, and Sicily, with isolated peaks of 44-45°C in eastern Basilicata and the Ionian coast of Calabria. The heat index in Messina reached 40°C, while Rome and Reggio Calabria hit 39°C. The ministry's bulletin for Monday 20 July shows the red alert expanding to 17 cities, as Catania, Messina, and Reggio Calabria move from orange to red. By Monday, seven northern cities including Milan, Turin, and Bologna will return to green alert, the lowest risk level, while the south remains under red alert.
Scandinavian trough to break the heat
A low-pressure system over Scandinavia is set to push cool air into the Mediterranean, breaking the African anticyclone that has dominated for weeks. The Lamma consortium of CNR and the Tuscany Region explains that the high pressure will not retreat easily, but between Tuesday and Wednesday a cold impulse from the north will breach the heat dome. Meteorologist Mattia Gussoni of iLMeteo.it confirms that the heat cap is about to give way, though the transition will be turbulent.
The heat cap that has oppressed Italy is about to give way. Before the change, we will have to deal with the last remnants of scorching air and the first signs of instability.
The temperature drop will be sharp. In the north and central Adriatic regions, maximum and minimum temperatures will fall by 5-6°C on Tuesday 21 July. Sardinia, which has suffered the most from the African heat, will see a drop of up to 10°C. The extreme south and Sicily will feel the relief by Wednesday 22 July, with temperatures falling several degrees. Later in the week, the Azores high will bring stable and more pleasant conditions, with temperatures returning to seasonal averages.
- 14 cities under red alert; thunderstorms in the north
- 17 cities under red alert; northern cities return to green alert
- Cool air reaches centre; temperature drop of 5-6°C in north, 10°C in Sardinia
- Cool air reaches south; thunderstorms spread to southern regions
Thunderstorms and severe weather risk
The arrival of cool air will trigger violent thunderstorms, especially in the north. On Sunday, the Civil Protection issued a yellow alert for Lombardy and Veneto, with storms already hitting Milan on Saturday evening with lightning and hail. The Triveneto area, the central Alps, and the northern Apennines are at risk of strong downbursts and large hail due to the high thermal energy accumulated over the past month. The storms will then extend to the centre and south, affecting Molise, Puglia, Basilicata, Calabria, and Sicily in the second half of the week.
Economic toll and drought
The prolonged heat has imposed a heavy economic cost. Confesercenti, the business association, estimates that 30-60 days of intense heat can cost the Italian economy between 6 and 12 billion euros annually, equivalent to 0.2-0.4% of GDP, due to higher energy costs, lower productivity, and lost revenue. The drought is also severe: the Po and Ticino rivers are at low levels, forcing farmers to ration irrigation. The bishop of Pavia has asked priests to add a prayer for rain to Sunday mass.
30-60 days of intense heat can weigh on the Italian economy between 6 and 12 billion, equal to about 0.2-0.4% of GDP, between higher energy costs, lower productivity, mandatory investments and lost turnover.
Political criticism and wildfires
As the heatwave persists, Green Europe spokesperson and Avs deputy Angelo Bonelli accused Prime Minister Giorgia Meloni of silence on the climate crisis. Wildfires are dotting the country, with French firefighters arriving in Sardinia to assist. The cool break is not expected to last: the Air Force forecasts above-average temperatures for the first half of August.
While Italy is in the grip of heat, with the Mediterranean up to 6 degrees above average, Giorgia Meloni continues not to utter a word on the climate crisis.
