The Met Office has issued a severe weather warning of fog for London and south east England ahead of the evening rush hour.
The yellow warning comes after around 100 flights were cancelled at Heathrow Airport today (January 23), as a blanket of freezing fog engulfed the capital.
The warning states: "Areas of freezing fog, some dense, are expected to form again during Monday night and into Tuesday morning."
Temperatures are expected to plummet to as low as -5°C overnight.
The severe weather warning is in place until Tuesday January 24.
"The fog will become widespread in places, most likely in the southwest of the warning area early in the night and then in other areas later in the night and early on Tuesday morning," the warning states.
"Driving conditions will be difficult with journeys likely to take longer than usual and delays to air travel are possible."
Those commuting to and from work should take care, and to those planning to board planes from London airports, should check before travelling.
If you are heading outside on Tuesday January 24, do not go without an extra layer, a hat and a pair of gloves as temperatures in London are not forecast to reach higher than 5°C.
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