Regional Weather Office Predicts Normal Southwest Monsoon Rainfall

Rapid Summary

• Chennai recorded 429.3 mm of rainfall during the southwest monsoon (June 1 – September 15), surpassing its average of 363.9 mm.
• tamil Nadu received slightly below-normal rainfall, at 256.9 mm compared to the normal average of 264.3 mm (-3%).
• Rainfall figures for nearby districts:

– Chengalpattu: Recorded a deficit with 278.3 mm (-16%).
– Kancheepuram: Received a slightly lower-than-average rainfall at 324.8 mm (-17%).
– Tiruvallur exceeded expectations, recording 27% above normal levels (491.5 mm vs normal of 385.8).

• Highlighted regional variations:

– Tenkasi experienced “large-excess” rainfall-237.7 mm (+68% above its norm).
– Nilgiris (+16%) and Coimbatore (+42%) also witnessed critically important departures from their regular monsoon averages.

• The southwest monsoon began withdrawing from Rajasthan on September 17, ahead of the season’s end on September 30.

Indian Opinion analysis

The observed deviations in Tamil Nadu’s regional rainfall highlight both variability and climate consistency within the southwest monsoon season framework (+/-19% considered normal). While localized excess rainfalls in districts such as Tenkasi and Tiruvallur can be positive for agricultural outputs, deficits seen in areas like Chengalpattu might signal potential localized water management challenges or drought risks.

Chennai’s better-than-average data reflects urban resilience amidst climatic shifts; however, experts’ caution that these preliminary statistics could still change emphasizes the impermanence of any single observation until seasonal closure dates (September-end).Overall trends within Tamil Nadu underscore the importance of adaptive water resource planning as districts grapple with differential impacts-a growing necessity given future climate uncertainties globally and locally.

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