Meteorological History of Hurricane Katrina - Formation

Formation

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Tropical Depression Twelve formed over the southeastern Bahamas at 5:00 p.m. EDT (2100 UTC) on August 23, 2005, partially from the remains of Tropical Depression Ten, which had dissipated due to the effects of a nearby upper tropospheric trough. While the normal standards for numbering tropical depressions in the Atlantic indicate that the old name/number is retained when a depression dissipates and regenerates, satellite data indicated that a second tropical wave combined with Tropical Depression Ten north of Puerto Rico to form a new, much more advanced system, which was then designated as Tropical Depression Twelve. Simultaneously, the trough in the upper troposphere weakened, causing the wind shear in the area to relax, thereby allowing the new tropical depression to develop. In a later re-analysis, it was determined that the low-level circulation of Ten had completely detached and dissipated, with only the remnant mid-level circulation moving on and merging with the aforementioned second tropical wave. As a result, the criteria for keeping the same name and identity were not met.

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