The government weather forecast er had initially issued the amber warning for southern England, but has now extended this across the nation.
It warns that “flying debris could lead to Injuries or danger to life”, that there could be “damage to buildings” and widespread power cuts.
It also states there could be “injuries and danger to life from large waves and beach material being thrown onto sea fronts, coastal roads and properties”.
Meanwhile Metcheck warns: "Gusts of 100mph+ are possible across peaks of Wicklow mountains and Western Cambrian Mountains in Wales late Sunday morning and early Sunday afternoon.
"Heavy rain will also develop on the cold front which moves Southeast through the course of the day with a moderate risk of a squall developing."
The Met Office’s updated warning reads: “Widespread very strong winds will affect much of England and Wales during Sunday.
“Gusts of 60-70 mph will occur widely in inland areas and 70-80 mph along southern and western coasts.
“Heavy rain will accompany the strong winds leading to very poor driving conditions.
“The winds will slowly ease from the north during the latter part of the afternoon and through the evening.”
A yellow warning for wind and rain is also in place for the rest of the UK as the biggest storm of the season bears down on Britain.
This warning reads: "Strong winds will be widespread and last throughout much of Sunday.
"Gusts of 50 to 60 mph are likely across many inland areas and around 70 mph in coastal areas.
"There is a small chance of even stronger winds across parts of Scotland, potentially 70 to 80 mph.
"However, it is currently very uncertain whether the wind will reach this strength here and when this will occur.
"A spell of heavy rain will also affect many regions for a time, making driving conditions particularly poor."
Daily Star online reported earlier how, on top of the gale force winds, a month of rain is also set to fall on Sunday.