Kolkata: Torrential rains lashed Kolkata on Tuesday, leaving at least ten dead and throwing over 90 flights into chaos by evening. In addition, 33 arrivals and 62 departures were delayed, while at least one flight had to be diverted, the bulletin said. The aviation chaos mirrored the citywide disruption as Kolkata lay waterlogged under record rainfall. On Tuesday, the maximum hourly rainfall of 98 mm was recorded between 3 am and 4 am, the India Meteorological Department (IMD) said, clarifying that it does not satisfy the cloudburst criteria. According to the IMD, rainfall exceeding 100 mm in an hour over a 20 to 30 sq km area is defined as a cloudburst.