Dennis formed almost a month later than now, though. Alberto is helping to pump up the subtropical ridge over the Caribbean, but that feature's gotta get to the central Carib. intact to have a shot. Any development is likely a few days away and, still, not terribly likely. Worth watching, though.
As for the question of what would cause it to move NE/ENE -- the flow at upper levels is largely heading toward that direction as associated with a trough of low pressure along the eastern seaboard. If Alberto were to deepen and become a more vertically coherent storm, it'd likely start to feel those winds more and head in that direction. As is, however, the convection wants to develop in the flow aloft well to the east of the center, while convection near/over the center is being suppressed by those upper winds and the dry air. Whether that changes overnight is still to be determined.
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