So, if you're in a hilly area, make sure you get your woollies ready as there are predictions that tomorrow night could set the record for the coldest winter night this season.
"During cold weather conditions aircraft have to be de-iced prior to departure to ensure that they are safe and additional measures are taken to ensure the safety of our operation is maintained at all times".
Exacta Weather's James Madden warned heavy and widespread snowfall this week threatens significant disruption.
"While areas from Wales and northern England into Scotland will see the brunt of the wintry weather, a few snowflakes can not be ruled out in London and parts of the Southeast".
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The warning becomes valid from 4am Tuesday morning and will be in place until 11.59pm on Tuesday night.
The Met Office warning states: "A spell of rain, quickly turning to sleet and snow, will move southeast across the United Kingdom on Monday night and Tuesday, gradually weakening across England and Wales". Ahead of the front there is s keen NE wind, especially around Kent and the south coast, this backs to a northerly today.
The Met Office has updated the yellow warning it issued at the weekend, which now comes into force at 8pm.
The forecast shows rain and sleet turning just after midnight. "It will stay cold". For Wales and the whole of Northern England, the front will arrive this morning, that's going to mean snow through the rush hour.
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Snow also hit parts of London and East Sussex as temperatures plummeted.
"It will remain cold with highs expected to only reach 3C to 4C".
The Met Office with Public Health England (PHE) has upgraded a cold weather health alert to a more serious level-3 caution.
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