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There is a significant low pressure system sitting just to the east of New England (moving around somewhat) This is blocked by a high pressure to the north creating the strong easterly flow. With these low pressure systems we usually get a pretty significant swell (more on east facing beaches; gansett is a white mess, at least SoCo was big clean swells). You also get elevated tide levels (storm surge).
The offshore winds wont do much against the swells, they might knock them down a bit, but expect big swells into the weekend...
In short just a good old fashioned Nor'Easter, odd for them to last 6 freakin days though. I wouldnt be expecting to drive the track at East Beach or Charlestown at anything but dead low for a few days...
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