Hurricane forecasters have turned their attention from Erin to other developing tropical systems in the Atlantic, including one that could become Tropical Storm Fernand and may follow a path similar to Erin's.

The National Hurricane Center is tracking two disturbances, Invest AL90 and Invest AL99 − so-called as "invest" is short for "investigation" − in the Atlantic, with the chance of developing into something stronger. The more likely to do so is Invest AL90, which is expected to develop into a tropical depression and intensify into a tropical storm on Sunday, Aug. 24, as it moves northward, the NHC said in an outlook issued at 8 a.m. ET Saturday, Aug. 23.

Also being tracked: four more tropical waves in the Caribbean to the east of Invest AL99, which is also a tropical wave located

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