The average rate imposed by the US was 2.5% in 2024 and had not been double digit for eight decades. For aviation, the outlook is deteriorating. Tariffs and trade wars do not boost economic growth.

Known as Kelvin-Helmholtz clouds, they form when a faster stream of air moves above rising air below. According to the Met Office website, Kelvin-Helmholtz clouds are "an extremely rare phenomenon".

Kelvin Helmholtz clouds are named after the two scientists who studied the physics behind them A rare cloud formation resembling waves in the sky has been seen across North Yorkshire. The billowy ...

"That's why clouds are the greatest challenge. Figuring them out is — and has been — the big roadblock," said Bjorn Stevens from the Max Planck Institute for Meteorology in Germany, who has ...

The weather until 6:00 pm on Wednesday will be relatively hot to hot daytime with some clouds and mild by night, the Meteorology Department has said. Offshore, it will be hazy with some clouds.