Prabably as rare as a snowstorm in Florida...
From
www.accuweather.com
A South Atlantic Tropical Cyclone!?! Literature dealing with tropical weather would agree: hurricanes are unknown over the southern Atlantic Ocean. Yet, as of early Friday, a storm with a well-formed eye about 300 miles east of southern Brazil has all the look of a hurricane. If, indeed, this is a tropical cyclone, it did not begin in the usual way; rather, it began as an ordinary "cool" trough that sat over warm seas for a few days. The atmospheric setting must have been "just right" to allow this trough to strengthen markedly while altering from cool-core to warm-core, and thus tropical, in nature.
Satelite Picts : from
www accuweather.com
Sean in NC