Hurricane Erika (2003)
A weak surface area of low pressure came apart from a frontal system on August 8. It was moving southwestward during that time. On August 9, it created convection  when it was passing underneath a cold-core upper-level low.  As the system rapidly continued westward, a lot of the convection stayed near the center of the upper-level low, preventing development of a closed surface circulation. On August 13, while located near the northwestern Bahamas, an increase in convection made the upper-level low building downwards to the middle levels of the troposphere, which caused the development of an upper level anticyclone.