Tropical Depression Eleven-E formed within the northern portion of a broad area of low pressure centered a few hundred miles south of Baja California. A sequence of daily satellite images and surface analyses suggest that the precursor low developed on the 19th of August, from a tropical wave that had crossed into the Pacific basin on the 15th. Dvorak classifications on the low began late on the 21st. The low produced numerous thunderstorms and winds approaching tropical storm force over a large area but did not develop a well-defined surface center of circulation until 1800 UTC on the 23rd, when a center formed about 90 miles southwest of Cabo San Lucas. At this time the convection was already decreasing and so the initial position represents the peak intensity of the tropical cyclone. Convection gradually diminished and the depression dissipated the following day.
The "best-track" for the depression is given in Table 1.
Table 1. Best track for Tropical Depression Eleven-E, 23-24 August 1999. Date/Time
Stage Lat. (°N) Lon. (°W) 23/1800 22.0 111.3 1000 30 tropical depression 24/0000 22.7 112.3 1002 30 " 24/0600 23.1 112.8 1004 25 " 24/1200 22.6 112.9 1005 25 " 23/1800 22.0 111.3 1000 30 minimum pressure