Eight (2009)

A tropical depression formed from a tropical wave on 25 September 2009 about 435 nautical miles west of the Cape Verde Islands. The system moved generally northwestward then northwest toward a weakness in the subtropical ridge. It briefly organized enough to be designated Tropical Depression Eight at 1800 UTC 25 September, but convection waned within 6–12 hours and the system dissipated into a trough by 1800 UTC 26 September; the remnants moved slowly west to west‑southwest afterward.

There were no landfalls associated with this system. The circulation remained well east of the Caribbean and the Americas and dissipated over the open eastern Atlantic, so no coastal direct impacts from a cyclone center occurred.

Maximum measured intensity was 30 knots (about 35 mph) with a minimum central pressure around 1008 mb, recorded at 1800 UTC 25 September. The system never reached tropical storm strength and remained classified as a tropical depression throughout its life.

Because the depression stayed over the open ocean and lost its deep convection quickly, there were no reported storm surge measurements or rainfall totals associated with land areas in the NHC report. No specific surge heights or rainfall accumulations for cities or counties were documented.

No deaths or storm-related damages were reported in the official report. The main impacts were limited to the open ocean where the system originated and dissipated; there were no confirmed direct or indirect casualties noted.

Notable aspects reported: the depression’s formation was poorly forecast — global models did not predict its development, and the system was only given a medium genesis probability in forecasts about 6 hours before formation. Persistent southwesterly wind shear and marginal sea surface temperatures prevented further intensification.