 Dry air and land weakened the tropical wave , and when it entered the area of the Bay of Campeche , it merged with a stationary frontal boundary . Cool , dry air around the system caused the system to develop a cold core , and the area organized into an extratropical low on September 30 . A large high pressure system over the northern Gulf of Mexico forced the system southward , where it developed significant convection . The system developed a warm core , and on October 1 the storm organized into Tropical Storm Larry while located 300 mi ( 483 km ) east @-@ southeast of Tampico , Mexico . 
