 A subtropical depression formed on September 21 in the northeastern Gulf of Mexico from the interaction of a tropical wave , the tail end of a cold front , and an upper @-@ level low . Initially containing a poorly defined circulation and intermittent thunderstorm activity , the system transitioned into a tropical depression after convection increased over the center . Tracking northwestward , the depression moved ashore near Fort Walton Beach early on September 22 , and shortly thereafter it dissipated over southeastern Alabama . 
