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Tropical Depression Twenty-one (21W) East of Vietnam

September 24th, 2011 Category: Tropical Storms

Tropical Depression Twenty-one (21W) - September 24th, 2011

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Track of Tropical Depression Twenty-one (21W) - September 24th, 2011 © Univ. of Wisconsin

Track of TS 21W

On the evening of September 21, at almost the same time when Tropical Storm Nesat (20W) was first seen, another low pressure area persisted far south of Hong Kong.

The low slowly drifted north and strengthened slowly until on September 24, when the JMA upgraded the system to a tropical depression east of Vietnam, Tropical Depression Twenty-one (21W).

Later that day, the JTWC issued a Tropical Cyclone Formation Alert stating that the low could develop into a tropical cyclone.

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