Tropical Storm Bret's formation on June 19 was in the so-called main development region (MDR) of the tropical Atlantic. The MDR of the Atlantic typically sees the vast majority of its activity during the height of the hurricane season – August into September.
The southeastern U.S. coast, Gulf of Mexico and the western Caribbean are usual breeding grounds for tropical storms in June. The map below of storm origins since 1950 shows Bret's far removal from where systems typically develop in June.
Bret is only the third known tropical storm to develop in the MDR region before July 1 in 167 years of records, according to Bob Henson of Weather Underground. Bret's naming on June 19 also marked the earliest a storm has formed in the MDR, beating Ana, which formed June 22, 1979.
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