WION Web TeamNew Delhi, Delhi, IndiaJan 04, 2018, 05.15 AM
In one of the largest single fog episodes over any land area in the world, an unbroken layer of fog was formed across more than 2,000km along the Indian subcontinent. The fog started from central Pakistan in the west, running right through the Indo-Gangetic plains and ending around Tripura.
This blanket of fog is being called a "superfog".
Reports said Wednesday's spread was certainly larger than other fog episodes in places such as central China, Italy or the California valley.
The fog started on Christmas covering east UP and Bihar on Christmas, it started covering more areas in its west, including Delhi, by December 31. By January 2, the fog spread to Punjab and was continuing to move west into Pakistan. It has severely affected aviation, rail and road transport, and caused a sharp drop in day temperatures across the region.
The daytime multi-channel fog detection scheme image captured by Insat 3D shows the fog covering at least four countries — Pakistan, India, Nepal and Bangladesh. The fog actually began on Christmas Day in east UP and Bihar. The only comparable fog episode of this scale will have been from this region itself in previous years.
According to the IMD website, at least 15 airports in the country reported moderate to severe fog between 6.30am and 9.30am on Wednesday. These include Agartala, Patna, Gaya, Guwahati, Gorakhpur, Allahabad, Agra, Lucknow, Varanasi, Rae Bareli, Chandigarh, Jammu, Ludhiana and Pantnagar. The worst hit was Amritsar, which had visibility below 100m for 18 hours, from 6.30pm on Tuesday till 12.30pm on Wednesday.