However , enough convection persisted for the depression to be upgraded into Tropical Storm Fay that evening .
A reconnaissance flight later that day discovered an ill - defined circulation which led to low confidence of the location of the center of circulation .
Enough convection persisted for the depression to be upgraded into Tropical Storm Fay that evening .
A reconnaissance flight later that day discovered an ill - defined circulation which led to low confidence of the location of the center of circulation .