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Preliminary Report
Tropical Depression Twelve
6 - 8 October 1999

James L. Franklin
National Hurricane Center
9 November 1999

Tropical Storm Arlene
Tropical Depression Two
Hurricane Bret
Hurricane Cindy
Hurricane Dennis
Tropical Storm Emily
Tropical Depression Seven
Hurricane Floyd
Hurricane Gert
Tropical Storm Harvey
Tropical Depression Eleven
Tropical Depression Twelve
Hurricane Irene
Hurricane Jose
Tropical Storm Katrina
Hurricane Lenny

[1999 Atlantic Hurricane Season]

Tropical Depression Twelve developed from a tropical wave that moved off the coast of Africa on 30 September. Satellite classifications on the system began on 3 October. Based on satellite classifications and cloud drift wind vectors from the University of Wisconsin, the system is estimated to have become a tropical depression on the 6th. Over the next three days, the depression moved somewhat erratically to the west-northwest without development. During this time, the low-level circulation center was mostly on the west side of the deep convection, due to the presence of an upper trough/low to the cyclone's north. Convection diminished on the 8th and the depression dissipated as the low-level circulation became less well defined. The remnant low-level cloud swirl could be tracked for several days thereafter as it continued west-northwest and then westward before dissipating completely north of the Lesser Antilles.

The "best-track" for the depression is given in Table 1.

Table 1. Best track for Tropical Depression Twelve, 6-8 October 1999.
Position Pressure
Wind Speed
Lat. (°N)Lon. (°W)
06/000014.4 44.81008 30tropical depression
06/060014.8 45.41008 30"
06/120015.0 45.81007 30"
06/180015.2 46.01007 30"
07/000015.4 46.21008 30"
07/060015.6 46.51008 30"
07/120015.8 46.71008 30"
07/180016.0 47.11008 30"
08/000016.4 47.51008 30"
08/060016.6 47.71008 30"
08/120016.8 47.91008 30"
08/180017.3 48.51010 25"
06/120015.0 45.81007 30minimum pressure


Last updated January 27, 2000