Motorists are being urged to exercise extreme caution if driving between now and 12 midday on Wednesday when the weather warning is due to be lifted.
The rest of the country has been placed under a yellow wind warning - with gusts of up to 100kph forecast - and high seas expected along the Atlantic coast.
Storm Gareth has been officially named and is on the way as Met Éireann issues three weather warnings - which includes a wind warning for Carlow.
A Met Office yellow weather alert for wind will come into force in Flintshire from 9pm this evening through to 3pm on Wednesday. Flying debris, such as roof tiles being blown off, and flooding, particularly in coastal areas, may occur.
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Storm Gareth is expected to hit the United Kingdom on Tuesday, bringing wind speeds up to 80mph and heavy rain.
Mr Deacon added: "It will be a very very windy day wherever you are in the country on Wednesday". Afternoon highs will be around 7 degrees.
Winds will be strongest after midnight, with gusts of 60mph in some exposed areas and 50mph inland, before easing later. "A squally cold front will move eastwards across the region between 10:00-14:00, after which both the winds and temperature will drop markedly". Winds will ease gradually here through Wednesday morning. A clearance may develop over more northern counties during the afternoon, but the rain looks likely to continue further south.
There are now three separate severe weather warnings put in place for Tuesday, including heavy rain in the North West of England, where flooding is likely.