Why Dense Fog Is Not Lifting Over Punjab Haryana And Chandigarh Even During Day

Jalandhar(Punjab)[India] December 21: Large parts of Punjab Haryana and Chandigarh have been facing dense to very dense fog for many days. Visibility dropped sharply at several locations. In some areas fog continued even during daytime. The India Meteorological Department has issued warning. It issued a yellow alert for the region. Fog conditions are expected to stay till at least December 27. Cold day conditions were also reported. Cold day means very low daytime temperature in plains. Roads highways and rail services were affected. Morning movement slowed down. Schools and offices saw delayed travel due to poor visibility.

Dry Weather And Low Temperatures Creating Perfect Conditions

According to IMD weather across Punjab and Haryana has remained dry. Dry weather allows cold air to settle near the ground. Surface temperatures stayed low for several days. Maximum temperatures remained below normal levels. In Punjab highest temperature touched. It was at max around 21 degrees Celsius. In Haryana it also stayed low. It was close to 20 degrees Celsius. These low temperatures keep moisture trapped near the surface. Fog forms easily during night hours. Without strong sunlight during the day it fails to clear. This cycle repeats daily making fog persistent.

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Weak Winds And Stable Air Prevent Fog From Clearing

Meteorologists say calm weather is the main reason behind long fog spells. Winds help mix air layers and remove fog. Currently winds remain very weak across north India. There are no strong western disturbances passing through the region. This keeps the atmosphere stable. Fog that forms at night stays close to the ground. Without air movement fog cannot rise or spread out. Experts explain that stagnant air blocks vertical mixing. As a result fog stays thick for longer hours including daytime periods.

Low Winter Sun Fails To Break Daytime Fog

Daytime fog is unusual but possible in winter. IMD says the low angle of the winter sun reduces heating. Weak sunlight cannot evaporate fog droplets. Cloud cover also blocks solar radiation. This prevents surface warming. Fog remains suspended close to the ground. Visibility drops further. Fog levels are classified based on visibility range. Many areas reported dense and very dense fog. In some places visibility dropped below 50 metres. This made daytime travel risky. Airports roads and rail operations faced repeated delays.

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Pollution And Local Factors Making Fog More Intense

Pollution plays a major role in increasing fog density. Pollutants act as tiny particles where moisture sticks easily. This makes fog thicker and longer lasting. High particulate matter traps moisture near the surface. Areas near canals farms and irrigated land see more fog due to higher moisture. Low lying regions allow cold air to settle. Urban areas add pollution to the mix. Because of these local factors fog intensity varies across locations. Relief is expected only when winds increase or weather patterns change.