As the system approached the Windward Islands it continued to slowly strengthen, peaking as a 50 mph (85 km/h) tropical storm early on August 15.

The remnants of Earl continued across the Caribbean Sea and eventually re-developed into Hurricane Frank in the eastern Pacific Ocean on August 23.

As the disturbance moved towards the west, satellite imagery revealed a much better structure with much-improved banding features and fair upper-level outflow,[1] leading to the formation of Tropical Depression Five at 1800 UTC on August 13, situated roughly 1000 mi (1610 km) east of the Lesser Antilles.

The depression progressed rapidly towards the west-northwest the following day, embedded and under the influence of a deep easterly flow around the southern periphery of a subtropical ridge to the cyclone's north.

[2] A combination of improved banding features and satellite intensity estimates by the afternoon of August 14 led to the subsequent upgrade of the system to Tropical Storm Earl.

[3] Within an environment characterized by low wind shear, high atmospheric humidity, and warm sea surface temperatures, Earl intensified, reaching a peak intensity of 50 mph (85 km/h) by 0600 UTC on August 15.

Despite an impressive satellite presentation associated with Earl as it passed through the southern Leeward Islands, a hurricane hunter flight reported that the system no longer had a low-level circulation late on August 15.

This watch was modified to a tropical storm warning by August 14 at 2100 UTC, with the addition of the islands of the Grenadines, Trinidad, Tobago, and Grenada.