From 49% rainfall deficit in September to 16% surplus in just 24 hours


Delhi recorded more than half of the rainfall in September in just 24 hours ending at 8:30 a.m. Friday, going from a lack of rain to a surplus of rain this month.

Safdarjung Observatory, Delhi’s main weather station, recorded 58.5mm of rainfall against a normal of 108.5mm between September 1 and September 22 (Thursday morning).

It received 72mm of rain in 24 hours ending at 8:30 a.m. Friday, making it the first episode of heavy rain this month. From September 1 to 23, the city received 130.5 mm of rain.

Normally, Delhi records 125.5mm of rainfall in September. Weather stations at Palam, Lodhi Road, Ridge Ayanagar and Pusa received 102mm, 71.4mm, 41.4mm, 106.2mm and 51mm of rain between 8:30 a.m. Thursday and 8:30 a.m. Friday.

Precipitation recorded below 15 mm is considered light, between 15 and 64.5 mm moderate, between 64.5 mm and 115.5 mm heavy, between 115.6 and 204.4 very heavy.

Anything over 204.4mm is considered extremely heavy rain. The weather bureau attributed the heavy rains to the interaction of a western disturbance and a low pressure system.

The capital has only recorded two bouts of heavy rain this monsoon season – the first being on July 1 when the city recorded 117.2mm of rainfall. Relentless rains over the past two days have also reduced the overall monsoon season deficit.

Delhi’s overall rainfall deficit during the monsoon season fell from 35% (until September 22) to 23% on Friday morning.

More rains are expected before the monsoon withdraws from the National Capital Region by the end of September, which could further reduce the deficit.

First post: STI


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