MIAMI, Fla. — Tropical Storm Hanna has formed in the central subtropical Atlantic, the National Hurricane Center announced Monday morning in its first official advisory on the system. Forecasters upgraded the system to a 40-knot (roughly 45 mph) tropical storm at 11:00 a.m. AST after satellite win d data confirmed a closed center of circulation. According […] Tropical Storm Hanna Forms In Atlantic, Weakening Forecast Within Days ...read more read less