A severe cold wave has spread across Bihar, bringing dense fog and sharp temperature drops. The India Meteorological Department warned on December 19 that conditions may worsen over the next 48 hours, affecting daily life and travel across multiple districts.

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• Severe cold wave affects large parts of Bihar
• IMD issues cold wave and cold day alert for 27 districts
• Dense to very dense fog reduces visibility, especially mornings
• Patna records sharp temperature fall within 24 hours
• Narrow day-night temperature gap keeps cold persistent
• Westerly winds and high moisture intensify winter conditions
• Sitamarhi, Champaran, Patna, Gaya among worst-hit districts
• Fog-linked road accidents reported in Gopalganj and Buxar
• Several deaths and injuries reported due to poor visibility
• District administrations arrange bonfires and emergency measures