Tropical Depression Ten (2005)
Tropical Depression Ten was a short-lived and weak tropical cyclone that was the tenth system of the record-breaking 2005 Atlantic hurricane season. It formed on August 13 from a tropical wave that emerged from the west coast of Africa on August 8. As a result of strong wind shear, the depression remained weak and did not strengthen beyond tropical depression status. It degenerated into a remnant low on August 14, but its remnants partially contributed to the formation of Hurricane Katrina, after merging with a tropical wave on August 19. Thus, it is often referred to as "the precursor to Katrina". The cyclone had no effect on land and did not directly result in any fatalities or damage.
On August 8, a tropical wave emerged from the west coast of Africa and entered the Atlantic Ocean. Tracking toward the west, the depression began to exhibit signs of convective organization on August 11. The system continued to develop, and it is estimated that Tropical Depression Ten formed at 1200 UTC on August 13, located about 1,600 miles (2,600 km) east of Barbados. Upon its designation, the depression consisted of a large area of thunderstorm activity, with curved banding features and expanding outflow. The environmental conditions were predicted to quickly become unfavorable, however. The depression moved erratically and slowly towards the west, and wind shear inhibited any significant intensification. Late on August 13, it was "beginning to look like Irene-junior as it undergoes southwesterly mid-level shear beneath the otherwise favorable upper-level outflow pattern". The wind shear was expected to relent within 48 hours, prompting some forecast models to suggest the depression would eventually attain hurricane status.
By early August 14, the shear had substantially disrupted the storm, leaving the low-level center of circulation exposed from the area of convection, which was also deteriorating. After meandering, the storm began to move westward. Forecasters expected it to resume a northwestward track as high pressure to the south of Bermuda was forecast to weaken and another high was predicted to form southwest of the Azores. By 1800 UTC on August 14, the strong shear had further weakened the storm, and it no longer met the criteria for a tropical cyclone. It degenerated into a remnant low, and the National Hurricane Center issued their final advisory on the cyclone. Moving westward, it occasionally produced bursts of convective activity, before merging with another tropical wave on August 19.
Tropical Depression Twelve formed over the southeastern Bahamas at 2100 UTC on August 23, partially from the remnants of Tropical Depression Ten. While the normal standards for numbering tropical depressions in the Atlantic stipulate that the initial designation be retained when a depression regenerates, satellite imagery indicated that a second tropical wave had combined with Tropical Depression Ten north of Puerto Rico to form a new, more complex weather system, which was then designated as Tropical Depression Twelve. In post-season reanalysis, it was found that the low-level circulation of Tropical Depression Ten had completely detached and dissipated; only the remnant mid-level circulation moved on and merged with the second tropical wave. As a result, the criteria for keeping the same name and identity were not met. Tropical Depression Twelve later became Hurricane Katrina.
Because Tropical Depression Ten never approached land as a tropical cyclone, no tropical cyclone watches and warnings were issued. No effects, damages, or fatalities were reported, and no ships reported tropical storm-force winds in association with the depression. The system did not attain tropical storm status and was not given a name by the National Hurricane Center. The storm partially contributed to the formation of Hurricane Katrina, which became a Category 5 hurricane on the Saffir–Simpson Hurricane Scale and made landfall in Louisiana and Mississippi, causing catastrophic damage, becoming one of the five deadliest hurricanes in the history of the United States.
Other articles of the topic Tropical cyclones : Hurricane Ida (2021), Hurricane Norman (2018), Hurricane Nicholas (2021), List of nicknamed tropical cyclones, Tropical Storm Krovanh (2020), Hurricane Karen (2007), Effects of Cyclone Amphan in India
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- List of storms in the 2005 Atlantic hurricane season
- Meteorological history of Hurricane Katrina
- Timeline of the 2005 Atlantic hurricane season
- Beven, Jack L. (2006-01-17). "Tropical Cyclone Report: Tropical Depression Ten" (PDF). National Hurricane Center. Miami, Florida: National Oceanic and Atmospheric Administration. Retrieved 2009-01-21.
- Avila, Lixion A. (2005-08-13). "Tropical Depression Ten Discussion Number 1". National Hurricane Center. Miami, Florida: National Oceanic and Atmospheric Administration. Retrieved 2009-01-21.
- Stewart, Stacy R. (2005-08-13). "Tropical Depression Ten Discussion Number 2". National Hurricane Center. Miami, Florida: National Oceanic and Atmospheric Administration. Retrieved 2008-01-21.
- Knabb, Richard D. (2005-08-14). "Tropical Depression Ten Discussion Number 3". National Hurricane Center. Miami, Florida: National Oceanic and Atmospheric Administration. Retrieved 2009-01-21.
- United States Senate (2006). Hurricane Katrina: a nation still unprepared. U.S. Government Printing Office. p. 61. ISBN 0-16-076749-0. Retrieved 2014-11-05. Search this book on
- Michael P. Erb. "A Case Study of Hurricane Katrina: Rapid Intensification in the Gulf of Mexico" (PDF). University of North Carolina Asheville. Archived from the original (PDF) on 2010-06-09. Retrieved 2009-06-26.
- Stewart, Stacy R. (2005-08-23). "Tropical Depression Twelve Discussion Number 1". National Hurricane Center. Miami, Florida: National Oceanic and Atmospheric Administration. Retrieved 2009-01-21.
- Knabb, Richard D.; Rhome, Jamie R.; Brown, Daniel P. (2005-12-20). Tropical Cyclone Report: Hurricane Katrina (PDF). National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Retrieved 2009-01-21.
- Media related to Tropical Depression Ten (2005) at Wikimedia Commons
- Tropical Depression Ten Tropical Cyclone Report
- Tropical Depression Ten advisory archive
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