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Tropical Cyclone Thane (06B) Near Sri Lanka

8.9N 80.0E

December 31st, 2011 Category: Tropical Cyclones

Tropical Cyclone Thane (06B) - December 29th, 2011

On December 23, the JTWC reported that a tropical disturbance had developed within the monsoon trough about 1,540 km (960 mi) to the east of Medan in Indonesia. Over the next couple of days the disturbance gradually developed further while moving towards the northwest, before the JTWC issued a TCFA on the system during December 25 before designating as Tropical Cyclone 06B later that day.

The IMD also reported during December 25, that the disturbance had organised sufficiently to be declared Depression BOB 05, while it was located about 1,000 km (620 mi) to the southeast of Chennai, India. During the next day, the IMD reported that the depression had intensified into a Deep Depression, before later that day reporting that it had intensified into Cyclonic Storm Thane. As it was named, Thane started to turn towards the west under the influence of a subtropical ridge of high pressure before its development slowed as strong outflow and marginally favourable sea surface temperatures fought with persistent easterly vertical wind shear.

Early on December 28, the JTWC reported that Thane had become equivalent to a category one hurricane on the SSHWS before later that day the IMD reported that Thane had become the first Very Severe Cyclonic Storm of the season. During December 28, Thane continued to intensify, and developed a small pinhole eye, before the JTWC reported that Thane had peaked early on December 29 with 1-minute sustained wind speeds of 150 km/h (90 mph). The IMD then followed suit and reported that the system had peaked as a Very Severe Cyclonic Storm with 3-minute sustained windspeeds of 140 km/h (85 mph).

During the rest of that day, the system continued to move westwards and weakened slightly as it started to interact with land. Thane then made landfall as a very severe cyclonic storm early on December 30 on the north Tamil Nadu coast between Cuddalore and Puducherry. After making landfall, frictional forces made Thane rapidly weaken into a depression. Here, the system can be seen near Sri Lanka.

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