As on Thursday morning, dense to very dense fog observed at isolated places over Punjab, East Uttar Pradesh, Nagaland, Manipur, Mizoram and Tripura.
Similarly, isolated places over Haryana, Delhi, West Uttar Pradesh, Bihar, West Bengal and Sikkim too observed fog of moderate intensity.
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The lowest visibility was recorded at Patiala wherein it dropped to less than 25 meters. The same way, Sultanpur and Agartala also saw visibility less than 50 meters each.
Visibility in Bahraich, Varanasi and Ambala was less than 200 meters, while Ludhiana, Delhi (Safdarjung), Lucknow, Fursatganj, Patna and Gaya saw lowest visibility at less than 500 meters.
The reason for the occurrence of dense to very dense fog over many parts of northwestern plains such as Punjab, Haryana, Delhi, west and central parts of Uttar Pradesh can be attributed to the change in wind direction in the wake of a fresh Western Disturbance lying over Jammu and Kashmir.
Northwesterly moderate winds were blowing across the plains of North India, have now changed and initiated from west-southwest direction, therefore the speed of winds have reduced significantly leading to the development of widespread fog. So, the three factors, high humidity, low temperatures and light winds that led to the formation of fog are at present accessible over the region.
Moving to the cause of foggy mornings over east and northeast parts of the country, two cyclonic circulations have been prevalent over the regions, one over Southeast Bangladesh and another over East Uttar Pradesh. A trough is also extending between these two weather systems.
Besides this, easterly winds are also blowing over northern parts of Uttar Pradesh, Bihar and West Bengal. These winds are moist in nature and of light intensity and coming from Bay of Bengal over Nagaland, Manipur, Mizoram and Tripura.
Consequently, the humidity levels have amplified considerably over the northeastern states leading in the development of dense to very dense fog.
Skymet Weather predicts similar weather conditions to endure for another 24 to 48 hours. Afterward the winds will again recommence form northwest direction over most parts of Indo Gangetic plains including Punjab, Haryana, Delhi, Uttar Pradesh and Bihar.
Additionally, the cyclonic circulation over Southeast Bangladesh will also fade away, leading to the reduction in the fog intensity over all the northeastern states.
IMAGE CREDIT: youtube.com
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