Hi Pam,
If Dean gets close to the upper low, a few things could happen. The upper low could start to evacuate some of Dean's outflow, a scenario that would help intensify the storm. This is more likely if the storm remains some distance away from the upper level feature. If it draws closer, it could impart a bit of wind shear on top of Dean, helping keep its intensity in check. It could also impart a bit more of a northward movement to Dean, something the computer models are showing for down the line -- but in the Gulf.
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