Italy: High temperatures forecast across much of the country through at least June 23

Forecast models indicate that a heatwave will persist across much of Italy through at least June 23. Temperatures of 30-40 C (86-104 F) are expected across the country over the coming days and may exceed 40 C (104 F) in interior areas of south-central mainland Italy and the islands of Sardinia and Sicily. The peak of the heatwave is expected around June 21, before a weather system moves into northern regions, bringing showers, storms, and some relief from the heat in northern areas. Another weather system is expected to move over the Italian Peninsula June 22-23, helping to moderate the excessive heat across the rest of the country.

As of June 19, officials have issued the following high-temperature warnings across the country:

• Orange high-temperature warnings (the middle level on a three-tier scale): Basilicata, Puglia, Sardinia, and Sicily regions.

• Yellow high-temperature warnings: Abruzzo, Calabria, Campania, Emilia-Romagna, Lazio, Marche, and Molise regions.

Officials could issue new alerts or update/rescind existing advisories as weather conditions change over the coming days.

The extended period of oppressive heat and dry conditions may produce ideal circumstances for additional wildfire growth throughout the region. Heatwaves also pose a threat to vulnerable groups - such as the elderly, children, pregnant women, and those with respiratory illnesses - due to the increased possibility of heat stroke or heat exhaustion during prolonged exposure to high temperatures. These health risks could also extend to relatively healthy individuals during significant heatwave events. In addition to significantly impacting athletes and those who work outdoors, high temperatures can cause problems for people using mass transit. The lack of air conditioning and cramped vehicles during rush hour may lead to some passengers being hospitalized for dehydration.

Very high temperatures may warp rail tracks and force passenger and freight trains to operate at reduced speeds. Road surface damage is also possible, and overheated vehicles may worsen traffic problems in urban areas where congestion is already a problem. Commercial trucking disruptions might occur, as very high temperatures put more stress on vehicles, making tire blowouts more common. Major flight disruptions are unlikely at regional airports, but general aviation disruptions are possible, and some airfreight carriers could reduce cargo loads. High temperatures could lead to an increased demand for electricity, which might trigger localized brownouts or blackouts, exacerbating hazardous conditions when air conditioning is no longer possible.