Red alert as 100mph gusts forecast
Gusts of wind as high as 100mph are due to sweep the country, with Scotland expected to be particularly badly hit.
Scotland and the Northern Isles are braced for the highest winds, while speeds could reach up to 90mph in northern England.
Forecasters expect stormy conditions across Scotland and a risk of thunder on Thursday night. Heavy bursts of rain could hit England, with northern England bearing the brunt.
The Met Office issued its highest - red alert - warning for winds of at least 75mph in Scotland between 3pm and 6pm. It also issued a lower "be aware" warning for parts of northern England.
A spokesman said travel conditions in Scotland will be "extremely poor" tomorrow and motorists could face "significant delays".
Gusts are expected to reach 90mph during the afternoon rush hour in the Borders, Strathclyde, Tayside, Fife, the Lothians and central and south-west Scotland. Fife Police said travellers should expect the Forth and Tay road bridges to be closed to traffic. The force said high winds could further disrupt roads, with fallen trees and other debris.
The Highways Agency advised drivers in north-east and north-west England and Yorkshire and the Humber to check the weather forecast and road conditions before they travel tomorrow.
Drivers of high-sided vehicles, caravans and motorbikes are advised to take extra care. High winds and rain will make it feel colder across the UK.
Aisling Creevey, a forecaster for MeteoGroup, the weather division of the Press Association, said: "In Scotland, the temperature looks to be about 9C (48.2F) but it certainly won't feel that way in those winds and that rain - you're probably looking at down to 0 or minus temperatures.
"We could see up to 90mph winds across eastern Scotland, possibly gusting up to 100mph across Scotland and the Northern Isles. Pretty much across most of the UK, it's going to feel cold tomorrow even though the actual temperatures are looking to be higher."