NASA has released satellite images showing the violent storm churning through the Atlantic Ocean towards to UK.
It is one of three weather warnings now in place around the country.
The Met Office said icy surfaces are also likely to be an additional hazard, especially overnight.
The weather is expected to turn wet and windy on Wednesday, especially across the north and west of the United Kingdom, before the gales hit on Thursday.
Met Éireann says scattered snow showers will occur from late Thursday and into Friday.
TEMPERATURES in York are set to fall below freezing in the coming days, and snow could be on the way.
There will be potentially damaging gusts of up to 80mph there, with higher speeds possible across the Northern and Western Isles.
"Road, rail, air, and ferry services may be affected, with longer journey times and cancellations possible", the Yellow weather warning reads. Some short term loss of power and other services is possible.
"Large waves are expected and beach material may be thrown onto coastal roads, sea fronts and properties".
Britain faces a -16C shiver from Siberia - as a colder-than-normal December was predicted by the Met Office winter forecast.
Winds are forecast to strengthen across parts of Britain on Wednesday ahead of the arrival of Storm Caroline.
It said that a "weather warning for snow and ice" has been issued from Thursday night.
"North and northwest counties will be most at risk, as well as higher ground elsewhere".
Ex-BBC and Met Office forecaster John Hammond said: "Much colder easterlies could arrive, meaning a predominantly chilly run-up to Christmas".
Northern England is also expecting snow on Sunday evening.