The UK faces flash floods and travel chaos as heavy rain and gale-force winds start to take effect, the BBC weather service has warned.
The storms are expected to drive in from the west to southern England and Wales during Tuesday.
Rain and gale-force winds are predicted to hit the rest of England, Northern Ireland and Scotland later on.
Roads and train tracks, even in city centres, face the prospect of being swamped, the BBC said.
Tomasz Schafernaker, a BBC weather forecaster, said that flash floods could be expected, even in London's underpasses, due to the volume of rain overwhelming drainage systems.