A storm of up to 50 metres per second is expected and roads could become impassable and flights may be disrupted as the winds are accompanied by snowfall.
The spokesperson added: "A very unsettled spell of weather is expected, with strong winds, combined with widespread and in places heavy rain".
It read: "Heavy and persistent rainfall is expected from Wednesday afternoon".
Dundee and the local area has been placed under a flood alert as the country braces itself for Storm Diana.
Storm Diana is set to hit the United Kingdom today, bringing heavy rain and gales of up to 70mph.
Yellow weather warnings have been issued for most of Scotland, the North West of England and down the western coast, with forecasters also predicting a knock-on effect in Yorkshire.
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The first sign of wet and windy weather will sweep across the country from the south west on Tuesday, November 27 but it will start to feel less-cold after a foggy start in Reading.
"If this occurs, gusts of 70-80 miles per hour could be seen, mainly in exposed locations, bringing increased likelihood of more significant disruption".
Storm Diana, named by the IPMA Portuguese weather service, is now threatening the Azores and is due to make itself felt over western parts of the United Kingdom on Wednesday. Winds will also turn northwesterly across Northern Ireland later, transferring the main focus to northern areas here.
Tomorrow Wednesday will be a very windy, blustery day, with strong to gale force winds, southerly veering southwest giving some severe gusts in places.
A new cyclonic low, which will span 2,000 miles from the north of France to southern Greenland could be strong enough to warrant another name - Deirdre - before the weekend.