Meteorologist Tom Morgan said: “Storm Agnes is now very much intensifying quickly about 1,000 miles or so away from the south-west of England, in the Atlantic Ocean, and it's moving quickly north-eastwards towards the UK.
“We are likely to potentially see some damaging winds, the possibility of some brief power interruptions, particularly in Irish sea coastal areas.”
Meteorologist Jim Dale described the movement of the storm: “So Northern Ireland, north-west England, west Wales, and south-west Scotland, that's where we'll probably see gusts of up to 75mph tomorrow afternoon, tomorrow evening, that's when the peak of the winds will be and then Storm Agnes will move across Scotland clearing away from Shetland through Thursday morning.”
He added: “In addition to the winds, there's going to be some large waves as well, so some big stormy seas, and therefore there might well be some coastal flooding where the waves break on to promenades and on to coastal roads.”
The storm will hit Ireland first, before hitting parts of the UK around midday.
Morgan described Storm Agnes as “more widespread” than Storm Betty - the last named storm to hit the UK.
However, he added the impact on travel will not be as widely felt.
Storm Agnes is approachingMet Office
However, the effects of the storm will not last for long, and instead will be replaced by an "Indian summer".
This means that Brits can expect to bask in the heat of another mini-heatwave.
Dale said that parts of Britain could expect a 'taste of an Indian summer' as early as this weekend.
October is set to hit highs of 23C, which is warmer than typically found in the autumn months.