"So it just re-emphasises that message that people should ask themselves the question 'is this journey absolutely and utterly essential?' - if not, do not travel".
Red warnings are the highest possible alerts that the Met Office can issue - indicating major danger to life, widespread damage, extreme weather and travel chaos.
According to the Met Office the temperature from midday on Friday will mainly be at 0° on what is set to be another cold, blustery day, dipping to -1° at 11pm.
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Britain, which is buffered by the Atlantic Ocean and tends to have temperate winters, saw heavy snow in some areas that disrupted road, rail and air travel and forced hundreds of schools to close.
Mr Snell warned: "Generally many places on Thursday will struggle to get anywhere near -1C, a few people will come up above, but many of us will be firmly below freezing".
Greater Anglia said it was hoping to resume a full service on Wednesday but that there may be delays and disruption to services over the course of the day. Some roads are likely to become blocked by deep snow, stranding vehicles and passengers.
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It advises to take care in blizzard-like conditions with strong easterly winds with the possibility of significant snow drifting. "Long interruptions to power supplies and other services such as telephone and mobile phone networks, could occur".
Motorists have been warned to take extra care on the roads due to the snowy conditions, after four people died in vehicle crashes amid the heavy snow.
As well as an amber warning in place until 8am this morning across south Wales, SW and south central England - there is an amber warning for snow for northern England, eastern Scotland and Northern Ireland - as further snow showers blow in off the sea here through the day - adding to already significant accumulations in places.
The Irish Republic was put under red alert at 11pm on Wednesday. There have been red warnings for wind and rain north of the border before, the Met Office confirmed.
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Des observateurs reprochent à Emery d'avoir laissé Neymar sur la pelouse alors que le match contre Marseille était gagné. Si tous les joueurs sont bien, mon choix est plus difficile, mais pour l'équipe c'est mieux.
"With the weather so severe at the moment it is really important that everyone keeps up to date with the forecast and warnings in their area, check for local travel information and follow the advice of local authorities and emergency services".