The monsoon arrived in Delhi 13 days ahead of schedule on Sunday,giving IGI Airport area a record breaking and isolated spell of 117.8 mm of rainfall in a matter of four hours.
The Safdarjung Met office recorded a total of 36.6 mm rainfall till 5 pm.
The monsoon arrived in Delhi today,almost two weeks ahead of its scheduled arrival on June 29. The monsoon has now covered the entire country, B P Yadav,Director of India Meteorological Department,said.
The rain pulled down the mercury to 37.2 degree Celsius,two points below normal.
The data maintained by the Palam Met office since its inception in 2005 showed that such intense rainfall over IGI Airport was witnessed last on September 15 in 2011.
In 2011,it was the withdrawal phase of monsoon and the record rainfall of 115. 6 mm had occurred during a period of just 75 minutes. On Sunday,another intense spell of record rainfall at 117.8 mm was reported between 1 pm and 5.30 pm at the IGI Airport. It was called isolated as Safdarjung reported only 36.6mm rainfall,less than one-third of that over IGIA, R K Jenamani,Director-in-charge of IGI Met department,said.
The weatherman said the early monsoon was the result of low pressure surface winds south of Delhi,over northwest Madhya Pradesh and adjoining north Rajasthan,along with associated circulation extending up to mid-tropospheric levels.
Due to high moisture easterly winds at lower-level and south-westerly winds at mid-level on the already arrived monsoon wind,massive clouds have continuously been building up with height reaching up to 14-km along Delhi towards north of Shimla and in the southwest towards the Gujarat coast,which brought such record intense rainfall. The forecast models show that a heavy cloud cover and rain will continue on Monday,but with reduced intensity, Jenamani said.
In 2012,the onset of monsoon was delayed by eight days. It had reached Delhi ahead of schedule in 2011 (June 26),but arrived late in 2010 (July 5). While the earliest onset of monsoon in the past 30 years was recorded in 2008 (June 15),the most delayed arrival occurred in 1987 (July 26).
Releasing an update on the monsoon forecast,the weather office had earlier said the country would receive normal and fairly distributed rain in July and August.
The country will receive 101 per cent of the long-term average rainfall in July and 96 per cent in August. For the country as a whole,monsoon has recorded an excess of 28 per cent since its onset over Kerala on June 1, the Met department said.