New Delhi, Dec 28: The national capital on Saturday recorded its coldest day of the season as the minimum temperature plummeted to 2.4 degrees Celsius in the morning, officials said.

The mercury even plunged to below two degrees Celsius in some areas with the Lodhi Road Observatory recording a low of 1.7 degrees Celsius.

In view of the severe cold wave, the IMD has issued a red-coded warning for several northern states, including Delhi, Punjab and Haryana. A red-coded warning is given for extreme weather events.

Dense fog enveloped the city reducing visibility and affecting air traffic and vehicular movement in the streets.

The Safdarjung Observatory, whose reading is considered the official marking for the city, recorded 2.4 degrees Celsius in the morning. The same temperature was recorded on December 30, 2013. Before that the coldest day in December was December 11, 1996 when minimum temperature recorded at the observatory was 2.3 degrees Celsius.

Other observatories recorded as follows: Palam 3.1 degrees Celsius, Aya Nagar 1.9 degrees Celsius, a senior MeT Department official said.

Due to very dense fog, zero visibility was reported in Palam Observatory area, which neighbours the city airport.

Due to heavy fog on Saturday morning, four flights were diverted from Delhi airport, said an airport official.

The official said that the flights were operating at the airport under CAT III B conditions, which means that the runway visual range (RVR) is between 50 metre and 175 metre.

According to railway officials, 24 trains were delayed due to poor visibility, ranging from 2-5 hours. Howrah New Delhi Poorva Express delayed by five hours.

The air quality turned severe again on Saturday, as falling temperatures, high humidity and low wind speed allowed accumulation of pollutants. The overall air quality index stood at 413 at 10 am.

Cold wave and severe cold day has been forecast over Delhi-NCR on Saturday, senior meteorologist at IMD, Kuldeep Srivastava said.

With chilling cold continuing to sweep Delhi-NCR, the region is expected to record its second-coldest December since 1901, the weather department said on Thursday.

"The mean maximum temperature for December was less than 20 degrees Celsius only in 1919, 1929, 1961 and 1997," an official of the India Meteorological Department said.

In December this year, the mean maximum temperature (MMT) till Thursday was 19.85 degrees Celsius. It is expected to dip to 19.15 degrees Celsius by December 31, he said.

Since December 14, most parts of the city have witnessed 15 consecutive "cold days" or a 15-day "cold spell". The last time such a long cold spell was witnessed was in December 1997.

After 1992, Delhi has had cold spells only in four years - 1997, 1998, 2003 and 2014.

"Severe cold/cold day" conditions are predicted till December 29.

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Mumbai (PTI): Police have arrested a man and seized over 500 grams of heroin worth Rs 2.54 crore in the illicit market from him in Mumbai, officials said on Friday.

The police's Anti-Narcotics Cell (ANC) made the drug seizure in Santacruz in the western suburbs. The operation was conducted by the Kandivali unit of the ANC on Thursday as part of a special crackdown against drug trafficking in the area, they said.

Acting on specific inputs, an ANC team conducted a raid in Santacruz (East) and intercepted a man. During a search, the team recovered 508 grams of high-grade heroin from his possession, an official said.

The seized contraband, a highly addictive, opioid drug derived from morphine, is estimated to be worth Rs 2.54 crore in the international market, he informed.

Following the seizure, a case was registered against the man under relevant sections of the Narcotic Drugs and Psychotropic Substances (NDPS) Act, 1985, and he was formally placed under arrest in the early hours of Friday.

The police are currently investigating the source of the drug and trying to identify the intended recipients of the consignment, he said.