A surge of moisture from the Caribbean is probable late next week.

This surge will come from the formation of a gyre of deep tropical moisture in Central America.

There is a possibility of tropical depression or storm formation within this moisture, but it isn't high.

Possible setup for the development of a tropical entity during the first week of October.

Current sea surface temperatures

More on Central American Gyres

Satellite images showing the evolution of Nicole from a gyre, Sept. 26-29, 2010.  (NASA/Aqua/MODIS)