A weather system brewing near Florida could become a preseason tropical storm, meteorologists have warned.The US-based National Hurricane Centre reported that the low pressure trough over the Straits of Florida was expected to strengthen in the next two days.A notice yesterday said: “It will likely become a tropical or subtropical storm on Saturday when it is located near the northwestern Bahamas. “Later in the weekend and early next week, the system is expected to move generally northeastward over the western Atlantic.”The NHC said the trough has an 80 per cent chance of becoming a subtropical or tropical storm inside 48 hours.The system was expected to bring heavy rainfall to Florida and the Bahamas today and tomorrow and tropical storm force wind gusts in the region are possible.The Bermuda Weather Service public forecast yesterday said: “The developing low-pressure system near the Bahamas will be monitored closely for signs of subtropical development.”The Atlantic hurricane season runs from June 1 to November 31, but many storms have formed outside that window over the years.Early forecasts warned this year could have a busy hurricane season.The University of Arizona, North Carolina State University and the Weather Company all predicted an above average number of storms.