Dense fog in Delhi, city sees season's longest zero visibility spell

Dense fog enveloped the national capital on Saturday, reducing visibility to zero for an unprecedented nine-hour stretch, the longest spell of the season, according to the weather department. The dense fog led to the delay of 81 trains while 15 flights got diverted on Saturday, according to officials. "Zero visibility prevailed for nine hours at Palam between 6 pm and 3 am (UTC), marking the longest spell of the season. The city's primary weather station, Safdarjung, recorded eight hours of zero visibility, as per the IMD." With the the maximum temperature in the city settled at 20 degrees Celsius, 0.7 notch above average and the minimum temperature was recorded at 7.8 degrees Celsius, 0.9 notch above the normal, according to the India Meteorological Department (IMD) said. The relative humidity during the day ranged between 96 and 100 per cent, it said. For Sunday, the weather department has predicted a partly cloudy sky. The predominant surface wind is expected to blow from the