[NASA] Ganges Delta Under a Winter Shroud of Fog

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3. Ganges Delta Under a Winter…

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January 6, 2026

Winter weather took hold across the Indo-Gangetic Plain in early January 2026, bringing dense fog and cold temperatures to much of the flat, fertile lands that span from Pakistan and northern India to Bangladesh.

This image shows low-lying clouds over the delta on the morning of January 6, captured by the

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(Moderate Resolution Imaging Spectroradiometer) on NASA’s

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satellite. Dense fog, particularly 

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, is common this time of year, forming when ground temperatures are cool, winds are light, and moisture is abundant near the surface. The meteorological departments of both

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and

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called for moderate to very dense fog over the region that day amid an ongoing cold wave.

Other relatively low-level clouds extend from the land areas and over the Bay of Bengal. These long, parallel bands of clouds, known as 

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, can form when cold air passes over warmer open water, gaining heat and moisture. Rising thermals ascend until they reach a temperature inversion that acts like a lid, forcing the air to roll into long, parallel rotating cylinders. Clouds develop where the air rises, while clear skies appear where the air sinks.

While it appears scenic from above, foggy conditions can pose hazards and snarl daily life for people on the ground. For instance, dense fog early in the month caused major disruptions at the international airport in Dhaka, according to

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. Similar disruptions, along with travel delays on roads and railways,

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in parts of northern, central, and eastern India.

NASA Earth Observatory image by Lauren Dauphin, using MODIS data from NASA 

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 and 

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 Story by Kathryn Hansen.

References & Resources

• Bangladesh Meteorological Department (2026, January 5)
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  . Accessed January 8, 2026.
• Dhaka Tribune (2026, January 2)
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  . Accessed January 8, 2026.
• India Meteorological Department (2026, January 5)
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  . Accessed January 8, 2026.
• NASA Earth Observatory (2024, January 18)
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  . Accessed January 8, 2026.
• The New Indian Express (2026, January 4)
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  . Accessed January 8, 2026.

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January 6, 2025

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