 An area of disturbed weather appeared on satellite imagery while forming within an old frontal zone on August 21. At 1200 UTC on the following day, a subtropical depression developed about 290 mi (470 km) north-northeast of Bermuda. The system strengthened slowly as it headed east-northeastward or eastward and by August 24, it became Subtropical Storm Bravo. During the next 24 hours, minimal intensification occurred. However, a deepening high-level trough and a building ridge enhanced outflow and deep convection on August 25. Additionally, reconnaissance aircraft flights began indicating a transition to a warm-core. Unfavorable northwesterly winds briefly halted further development, though by late on August 26, Bravo resumed acquiring tropical characteristics after another deepening trough accelerated the storm eastward.
