Forecasters monitor storm off Florida coast

Satellite image, taken Sunday at 11:15 a.m. EDT, of the storm developing off Florida's Atlantic coast.

MIAMI, Florida (CNN) -- A weather system off the East Coast of Florida could become the season's next tropical depression, forecasters say.

A reconnaissance plane is monitoring a "vigorous tropical disturbance" about 150 miles east of Cape Canaveral, the National Hurricane Center reported at 11:30 a.m. Sunday.

It was moving to the west or west-northwest about 5 to 10 mph. A tropical depression has maximum sustained winds of 38 mph.

"Interests along the Georgia and Florida east coasts should closely monitor the progress of this system in case any watches or warnings are required later today," the National Weather Service said.

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Meanwhile, Tropical Storm Dolly was moving west-northwest about 17 mph with winds near 40 mph, but it wasn't expected to pose any immediate threat to land.

At 11 a.m. EDT, it was near latitude 15.2 north and longitude 50.5 west, about 710 miles east of the Leeward Islands.

Forecasters expect Dolly to make a gradual turn to the northwest but not strengthen over the next 24 hours. It isn't expected to threaten any land areas.