Flights from Heathrow airport in UK cancelled due to fog

Around 100 flights from Heathrow airport was cancelled today with Jet Airways announcing the reschedule of its Heathrow-New Delhi flight by nearly three hours, as thick fog engulfed much of southern England.
"Foggy weather across London is expected on Monday, January 23, 2017 and some passengers may experience disruption to their journey," according to the Heathrow airport website.
However, there is no other flight cancellations to India including the flag-carrier Air India.
Jet Airways said its Heathrow-New Delhi flight (9W 121) will leave at 22:00 hours tonight instead of 19:25 hours.
The Met Office issued a severe weather warning for London, South East England and parts of South West England over dense, freezing fog.

In England, a low of minus 6.2 C was recorded at Northolt, about 15 km from Heathrow. Visibility on the tarmac at Heathrow was down to 100 metres.