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Saturday, September 18, 2021

Delhi: 7th heavy rain spell makes it wettest monsoon in 46 yrs

NEW DELHI: The city recorded the wettest monsoon in the past 46 years this year. Safdarjung weather station, which logs the official readings for the capital, has already recorded 1,139.8mm of rainfall for this season till 5.30pm on Saturday. The record seasonal precipitation is 1,155.6mm rainfall in 1975.
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With India Meteorological Department issuing an orange alert for moderate rain for Sunday, the 1975 record looks likely to be overtaken. The normal average precipitation from June till September otherwise measures 653.6mm. The all-time record is 1,420.3mm rainfall in 1933.
Saturday’s was also the city’s highest rainfall on a September day in the past 77 years at 383.4mm rainfall till 5.30pm. The only time the city received more rainfall in a day in September was 417.3mm rainfall in 1944. The normal mark for the entire month of September is 125.1mm rainfall. In September 2020, Safdarjung had recorded only 20.9 mm rainfall.
RK Jenamani, senior scientist at IMD, said September this year has been “highly unusual.” He said, “In just 11 days, the rainfall is almost three times than the normal for the month. With 19 days still left, more records may be broken.”
Despite the late arrival of the monsoon on July 13, the capital received 507.1mm rainfall in July, a surplus of 141%. With just 34.8 mm rainfall, however, there was a deficit of deficit of 47% in June. Though August was in deficit of 13%, it still recorded 214.5mm of rainfall.
Saturday was the seventh ‘heavy’ rain spell over Delhi this season with Safdarjung logging 94.7mm till 8.30am on Saturday, far above the 64.5mm that is characterised as heavy precipitation. This year, a record seven “heavy rain” days were recorded at Safdarjung since July, beating the earlier highest of six in 1964. Palam reported eight heavy rain days. Heavy rain events have high impact repercussions such as flooding.
The city could again suffer waterlogging on Sunday with IMD issuing an ‘orange’ alert for moderate rainfall. Light rain is expected from Monday onwards through the week.
The maximum temperature on Saturday was 26.8 degrees Celsius, seven degrees below normal. It was the lowest maximum temperature recorded in September in the past four years. The air quality, meanwhile, remained in the ‘satisfactory’ category with an overall Air Quality Index (AQI) of 61.

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