NEW ORLEANS -- There has been some confusion on the difference between a tropical storm and a subtropical storm.

Subtropical storms are not just smaller tropical storms, they’re actually different down to their core.

Tropical storms have their strongest winds near the center of the storm, while a subtropical storm’s strongest winds are displaced from the center.

MORE: Tropical Storm Watch issued for Alberto

The same goes for the storm’s convection, or thunderstorm activity. Tropical storms keep theirs near the middle while subtropical storms do not. In Alberto’s case, most of the convection is to the Northeast.

Tropical storms are also fueled by warm ocean waters, but subtropical storms have cold-core that gains its energy from other sources.