A dog runs over dried grass in front of Tower Bridge during the fifth heatwave of the year in London, Thursday, Aug. 13, 2026. (AP Photo/Kirsty Wigglesworth)

People watch a carousel on the South Bank of the River Thames during the fifth heatwave of the year in London, Thursday, Aug. 13, 2026. (AP Photo/Kirsty Wigglesworth)

The ruins of the ancient Roman Neronian bridge, emerge from the riverbed of the Tiber river due to drought, in Rome, Thursday, Aug. 13, 2026. (AP Photo/Gregorio Borgia)

The ruins of the ancient Roman Neronian bridge, emerge from the riverbed of the Tiber river due to drought, in Rome, Thursday, Aug. 13, 2026. (AP Photo/Gregorio Borgia)

The ruins of the ancient Roman Neronian bridge, emerge from the riverbed of the Tiber river due to drought, in Rome, Thursday, Aug. 13, 2026. (AP Photo/Gregorio Borgia)

A woman poses for a photograph outside the Houses of Parliament in London, Monday, Aug. 10, 2026. (AP Photo/Kin Cheung)

A woman shades under an umbrella as she walks past the London Eye during the fifth heatwave of the year in London, Thursday, Aug. 13, 2026. (AP Photo/Kirsty Wigglesworth)

This NOAA satellite image taken at 11:38 a.m. EST on Wednesday, Aug. 12, 2026, shows a Potential Tropical Cyclone One-C, about 1,000-miles east-southeast of the Hawaiian Islands. (NOAA via AP)