Snow fell over parts of Britain overnight but the wintry weather has not caused any significant disruption yet.
Snow was reported across the Midlands, South East England and parts of Scotland, but did not accumulate.
The Highways Agency reported no major problems overnight, but are still braced for potential adverse weather conditions to come.
Staff at Heathrow Airport monitored the weather closely but no flights were cancelled due to the weather.
However adverse weather conditions are causing some disruption to flights at Leeds Bradford Airport.
The Met Office upgraded its “cold weather action” warning to level three – one underneath a national emergency – for all of England.
It still has three amber snow warnings in place in the East Midlands, North East England and Yorkshire to highlight the hazardous conditions and likelihood of disruption to travel services caused by the ice, snow and freezing temperatures.
A second, heavier band of sleet and snow is expected to move eastwards across the country this morning, bringing up to 10cm of snow on higher ground.
Rain and sleet will continue to spread east in the afternoon, turning to snow across Buckinghamshire and Oxfordshire.
However snow will turn to wintry showers by Monday night.
Temperatures are expected to drop further to around -8C on Wednesday night with the possibility of more light snow flurries.
The Highways Agency has said it is “well prepared” for winter conditions.
A spokeswoman said: “We have a fleet of 500 state-of-the-art winter vehicles on standby, supported by tried-and-tested winter resilience plans.
“We have reviewed salt stock levels and taken action where needed to enhance our resilience and we have again established a reserve salt stock to help ensure that there is enough salt to deal with severe winter.
“Our roads will be treated whenever there is a risk of ice or snow. However, even when roads have been treated, drivers should still take care, especially on stretches where the local road layout or landscape means there could be a greater risk of ice forming.”
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