Geneva: Swiss authorities issued red heat alerts Tuesday for several regions, including Geneva, the Basel area, and parts of the southern canton of Ticino, as temperatures are forecast to reach up to 38C (100.4F) in the coming days, according to MeteoSuisse.

According to Anadolu Agency, the federal weather service placed Geneva under a Level 4 heat wave warning from noon Wednesday until August 5. The alert applies to areas below 800 meters (2,525 feet) in altitude, with daytime temperatures expected to range between 34C and 38C, while overnight lows will remain between 18C and 23C.

The most intense heat in French-speaking Switzerland and Valais is forecast from Wednesday afternoon through Thursday evening. However, thunderstorm activity could bring temporary relief by Friday.

MeteoSuisse's national warning map indicated that much of the rest of Switzerland remains under Level 3 heat warnings as the hot weather extends across large parts of the country.

MeteoSwiss warned that the heat wave poses a severe risk of circulatory problems and physical discomfort. It advised people to drink at least 1.5 liters (31 ounces) of water per day, seek shade and cool rooms, avoid strenuous activity during the hottest part of the day, and keep in contact with at-risk people.

Forecasts indicate temperatures will remain above 30C into early next week, according to MeteoSuisse.