India Meteorological Department (IMD) has forecast a gradual fall in minimum temperatures by 2-3 degrees Celsius over most parts of northwest India over the next four days.

It said that dense to very dense fog conditions are expected in isolated pockets of Punjab, Haryana, Chandigarh, North Rajasthan, North Uttar Pradesh, Sub-Himalayan West Bengal, Sikkim, West Assam, Meghalaya and Bihar today.

The weather agency has predicted light to moderate rainfall accompanied with thunderstorm and lightning over Tamil Nadu, Puducherry, Karaikal, Kerala and Mahe today.