Abbreviated Tropical Cyclone Report

Subtropical Depression Twenty-Two

8 -- 10 October 2005

Jack Beven

National Hurricane Center

17 January 2006

A large mid/upper-level trough persisted over the central north Atlantic
Ocean during the first week of October, aided to some extent by the
outflow from Tropical Storm Tammy near the Florida east coast. A
mid/upper-level low formed in the trough around 5 October, and an
associated surface trough developed to the east of the low on 6 October.
The surface trough moved northwestward on 7-8 October on the northeast
side of the upper low. The surface system developed a closed circulation
and organized convection on 8 October, and it is estimated that it
became a subtropical depression around 0600 UTC about 535 n mi southeast
of Bermuda. The association of the surface and upper-level lows,
combined with the influence of the cold air of the upper-level low, gave
the depression the structure of a subtropical cyclone instead of a
tropical cyclone. The depression turned westward on 9 October on the
north side of the upper low. Strong easterly vertical wind shear caused
the convection to diminish, and the depression became a non-convective
remnant low on 10 October about 150 n mi west-southwest of Bermuda. The
remnant low turned northwestward later that day and merged with a cold
front on 11 October east of Cape Hatteras, North Carolina. The low then
intensified as an extratropical system, causing gale-force winds to the
northeast of the center as it meandered off the mid-Atlantic states from
12-14 October. The system was absorbed by a larger extratropical low
late on 14 October.

A tropical storm watch was issued for Bermuda at 1500 UTC 8 October. The
watch was cancelled at 0300 UTC 9 October when it became apparent that
the shear would not allow the depression to strengthen.

There was some question as to whether this depression was a
re-development of Tropical Depression Nineteen from the eastern
Atlantic. Satellite imagery indicates that at the time the
pre-Subtropical Depression Twenty-Two surface trough was forming on 6
October, the remnants of Tropical Depression Nineteen were a few hundred
miles to the east. Those remnants weakened and were absorbed into the
developing subtropical depression on 7 October.

Table 1. Best track for Subtropical Depression Twenty-Two, 8 -- 10
October 2005.

+---------+---------+---------+---------+---------+-----------------+
| Da      | L       | Lo      | P       | Wind    | Stage           |
| te/Time | atitude | ngitude | ressure | Speed   |                 |
|         |         |         |         |         |                 |
| (UTC)   | \(N\)   | \(W\)   | (mb)    | (kt)    |                 |
+---------+---------+---------+---------+---------+-----------------+
| 08 /    | 26.1    | 57.4    | 1009    | 30      | subtropical     |
| 0600    |         |         |         |         | depression      |
+---------+---------+---------+---------+---------+-----------------+
| 08 /    | 27.7    | 58.5    | 1008    | 30      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 08 /    | 28.8    | 60.1    | 1009    | 30      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 09 /    | 29.3    | 62.0    | 1009    | 25      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 09 /    | 29.3    | 63.3    | 1009    | 25      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 09 /    | 29.5    | 64.5    | 1009    | 25      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 09 /    | 30.0    | 65.2    | 1009    | 25      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 10 /    | 30.7    | 66.0    | 1009    | 25      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 10 /    | 31.6    | 67.5    | 1009    | 25      | remnant low     |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 10 /    | 32.5    | 68.9    | 1009    | 30      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 10 /    | 33.5    | 70.0    | 1008    | 30      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 11 /    | 34.3    | 71.0    | 1008    | 30      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 11 /    | 35.5    | 71.7    | 1008    | 30      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 11 /    | 36.7    | 71.8    | 1008    | 30      | extratropical   |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 11 /    | 37.8    | 71.7    | 1008    | 30      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 12 /    | 38.5    | 71.9    | 1009    | 30      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 12 /    | 38.8    | 72.4    | 1010    | 30      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 12 /    | 38.9    | 73.0    | 1011    | 35      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 12 /    | 38.7    | 73.5    | 1011    | 40      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 13 /    | 38.3    | 73.5    | 1010    | 40      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 13 /    | 37.7    | 73.5    | 1010    | 40      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 13 /    | 37.2    | 73.0    | 1008    | 40      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 13 /    | 37.8    | 73.0    | 1006    | 40      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 14 /    | 38.0    | 73.4    | 1006    | 40      | \"              |
| 0000    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 14 /    | 37.6    | 73.8    | 1005    | 40      | \"              |
| 0600    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 14 /    | 38.6    | 73.8    | 1005    | 35      | \"              |
| 1200    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 14 /    | 39.6    | 73.8    | 1005    | 30      | \"              |
| 1800    |         |         |         |         |                 |
+---------+---------+---------+---------+---------+-----------------+
| 15 /    |         |         |         |         | absorbed by     |
| 0000    |         |         |         |         | larger          |
|         |         |         |         |         | extratropical   |
|         |         |         |         |         | low             |
+---------+---------+---------+---------+---------+-----------------+
| 08 /    | 27.7    | 58.5    | 1008    | 30      | minimum         |
| 1200    |         |         |         |         | pressure        |
+---------+---------+---------+---------+---------+-----------------+

![](media/image1.wmf){width="7.720138888888889in"
height="6.057638888888889in"}

Figure 1. Best track positions for Subtropical Depression Twenty-Two, 8
-- 10 October 2005. Track during the extratropical stage is based on
analyses from the NOAA Hydrometeorological and Ocean Prediction Centers.