Abbreviated Tropical Cyclone Report

Tropical Depression Ten

13-14 August 2005

Jack Beven

National Hurricane Center

17 January 2006

Tropical Depression Ten formed from a tropical wave that emerged from
the coast of Africa on 8 August. The wave moved westward and began
showing signs of convective organization on 11 August. The system
continued to develop, and it is estimated that a tropical depression
formed around 1200 UTC 13 August about 925 n mi east of Barbados (Table
1 and Figure 1). The depression moved erratically westward and, due to
strong southwesterly vertical wind shear, weakened to a non-convective
remnant low the next day. The low moved generally west-northwestward and
occasionally produced convection until it degenerated to a tropical wave
on 18 August just northeast of the Leeward Islands.

Operationally, there was a question of whether the remnants of Tropical
Depression Ten spawned Hurricane Katrina. Analysis of satellite imagery
indicates that the remnant low-level vorticity of Tropical Depression
Ten dissipated near Cuba on 21 August. However, a mid-level vorticity
center generated by a convective burst lagged to the east of the
low-level remnants and was overtaken by the low-level vorticity of the
next westward-moving tropical wave on 19 August. This combination of
meteorological features went on to spawn Hurricane Katrina.

Table 1. Best track for Tropical Depression Ten, 13 -- 14 August 2005.

+---------+---------+---------+---------+---------+-----------------+
| Da      | L       | Lo      | P       | Wind    | Stage           |
| te/Time | atitude | ngitude | ressure | Speed   |                 |
|         |         |         |         |         |                 |
| (UTC)   | \(N\)   | \(W\)   | (mb)    | (kt)    |                 |
+---------+---------+---------+---------+---------+-----------------+
| 13 /    | 13.3    | 43.6    | 1009    | 25      | tropical        |
| 1200    |         |         |         |         | depression      |
+---------+---------+---------+---------+---------+-----------------+
| 13 /    | 13.8    | 44.7    | 1008    | 30      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 14 /    | 13.8    | 45.7    | 1008    | 30      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 14 /    | 13.4    | 46.0    | 1009    | 25      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 14 /    | 13.5    | 46.4    | 1009    | 25      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 14 /    | 13.9    | 46.7    | 1010    | 25      | remnant low     |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 15 /    | 14.4    | 47.4    | 1010    | 25      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 15 /    | 14.5    | 48.4    | 1010    | 25      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 15 /    | 14.6    | 49.3    | 1010    | 25      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 15 /    | 14.8    | 49.9    | 1010    | 25      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 16 /    | 15.1    | 50.4    | 1010    | 25      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 16 /    | 15.5    | 51.1    | 1010    | 25      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 16 /    | 16.0    | 52.0    | 1010    | 25      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 16 /    | 16.1    | 53.2    | 1010    | 25      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 17 /    | 16.1    | 54.1    | 1010    | 25      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 17 /    | 16.1    | 54.9    | 1010    | 25      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 17 /    | 16.7    | 55.6    | 1010    | 25      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 17 /    | 17.1    | 56.6    | 1010    | 25      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 18 /    | 17.3    | 57.7    | 1010    | 25      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 18 /    | 17.6    | 58.9    | 1012    | 25      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 18 /    | 18.0    | 60.1    | 1014    | 25      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 18 /    |         |         |         |         | dissipated      |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 13 /    | 13.8    | 44.7    | 1008    | 30      | minimum         |
| 1800    |         |         |         |         | pressure        |
+---------+---------+---------+---------+---------+-----------------+

![](media/image1.wmf){width="8.149305555555555in" height="6.30625in"}

Figure 1. Best track positions for Tropical Depression Ten, 13-14 August
2005.