Dense fog affected flight operations at the Indira Gandhi International Airport on Tuesday morning.
About 100 flights were delayed due to bad weather in Delhi and some other destinations, apart from operational reasons. Two domestic and one international flight had to be diverted to Lucknow, Jaipur and Karachi and six flights had to be cancelled.
"There was patchy movement of very dense fog over both the new and main runway between 3 am and 7.30 am, with visibility hovering between 75 and 200 metres at the new runway 29 and between 100 and 200 metres at the main runway 28," said RK Jenamani, Director-in-Charge, IGIA met unit.
Low visibility procedures were implemented on new runway from 2.15 am and on main runway from 3.08 am, and was terminated at 12.30 pm on both the runways.
A total of 280 flights operated using different categories of the Instrument Landing System.
"The patch of dense fog was moving consistently in the morning and even though visibility improved by 9 am, shallow fog remained throughout the day at the airport," he said.
The met department has forecast dense fog again on Wednesday morning between 5 am and 9am. "On Wednesday, fog is expected to set in early and remain for a longer duration," he said.
"CAT III dense fog is expected to set in by 1 am, reducing general visibility to below 200 metres. Visibility on the runway 29 will improve from 9.30 am and by 9 am at runway 28," he added.
The airport witnessed dense fog after nearly a fortnight but foggy conditions are expected to remain till January 20, he said.
Train schedules off gear
Railway schedules were also thrown off track on Tuesday due to dense fog in the capital and other parts of northern India.
Around 100 trains were delayed and eight had to be rescheduled. High-speed trains such as Rajdhani and Shatabdi were also running hours behind schedule.
The average delay time in the arrival and departure timing of trains was around six hours on Tuesday.
Next week is going to be crucial for northern railways as it is the last spell of the fog this season and the met department has predicted dense fog in north India.
The railways have already cancelled more than 60 trains to decongest tracks.