• According to the IMD, 'very dense' fog occurs when the visibility is between 0 and 50 metres, 51 and 200 meters 'dense', 201 and 500 'moderate', and 501 and 1,000 'shallow'
Cold wave conditions prevailed in parts of Delhi on Sunday with the minimum temperature in the Ridge region falling to 3 degrees Celsius, the India Meteorological Department said. The minimum temperature is likely to drop further on Monday. According to the weather forecast by the India Meteorological Department (IMD), a dense fog enveloped the national capital this morning and the minimum temperature is likely to drop to 4 degrees Celsius.
According to a statement issued by the IMD, "Today, cold wave to severe cold wave conditions prevailed at isolated places over Rajasthan and cold wave conditions prevailed at isolated places over Haryana and Delhi."
The IMD declares a cold wave in an area when the minimum temperature is 4.5 degrees Celsius or more above the normal, or when it settles to 4 degrees Celsius or less.
According to the IMD, some places in the capital also recorded a cold day on Sunday - when the minimum temperature was less than or equal to 10 degrees Celsius and the maximum temperature was at least 4.5 degrees Celsius below normal.
Dense fog and cold wave are expected in most areas of the city on Monday.
The Safdarjung Observatory, Delhi's primary weather station, recorded a minimum temperature of 5.3 degrees Celsius, three notches below normal.
The maximum temperature was recorded at 16.2 degrees Celsius, five degrees below normal and the lowest temperature so far this season.
The mercury in the Ridge region dropped by 3 degrees Celsius, 4.9 degrees Celsius below normal, making it the coldest place in the capital.
The Aya Nagar weather station recorded a minimum temperature of 3.5 degrees Celsius, which is 4.5 degrees below normal.
Dense to very dense fog observed over parts of National Capital Region, Haryana, Punjab, West Uttar Pradesh and North Rajasthan.
The IMD said that foggy conditions would continue in these areas for the next few days.
According to the IMD, "very dense" fog occurs when the visibility is between 0 and 50 metres, 51 and 200 meters "dense", 201 and 500 "moderate", and 501 and 1,000 "shallow".
In the plains, if the minimum temperature drops to 4°C, the IMD declares a cold wave. Cold wave is also declared when the minimum temperature is 10 degrees Celsius or less and is 4.5 degrees below normal.
A "severe" cold wave occurs when the minimum temperature drops by two degrees Celsius or the departure from normal exceeds 6.4 degrees Celsius.
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