There will be strong winds and heavy rain over the weekend, and localised flooding is likely.
Several planes rocked from side to side as they came into land at Birmingham Airport during fierce crosswinds from Storm Dennis.
The amber warning is in place from midday tomorrow until midnight for southern Scotland with yellow warnings for wind and rain across the rest of the country are in place from tomorrow through to Monday.
As Storm Dennis dissipates from Tuesday, daily breakdown numbers are expected to fall from 31,000 on Monday (February 17) to 24,000 on Friday (February 21) with 223,800 breakdowns expected over the entire half-term period (February 14-23).
Met Office meteorologist Matthew Box said inland gusts could reach 50mph by Saturday afternoon, rising to 80mph in exposed areas in the south and west.
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The Met Office's website has the latest weather warning updates.
The winds could cause disruption to travel, and there's a chance of some damage to buildings.
Fast flowing or deep floodwater is also likely, "causing danger to life", while trains, buses and roads could be hit by closures, cancellations and delays.
Scaffolding can be seen on the King's Lynn Winter Night Shelter and Mojito night bar on Broad Street after Storm Ciara had a destructive impact last weekend.
"We are as prepared as we can be for whatever the weather brings, and ready to work alongside the emergency services, district councils, other authorities, and our communities again to mitigate any impacts as a result of Storm Dennis".
Keith Ashcroft, the EA's area director for Cumbria and Lancashire, said: "We knew there was a storm, which we were expecting to be incredibly windy, but not that wet".