A vigorous trough is set to dig into the country's mid-section midweek, eject into the Ohio Valley and begin lifting as it approaches New England. Out ahead of it, an anomalously strong southerly flow will transport anomalous PWAT values into the region, along with llvl moisture and warmth. These two factors will help to contribute to at least some modest elevated instability along with the potential for weak sfc instability.
Both the GFS/euro indicate a vigorous 500mb jet streak pushing through New England (80-100+ knots) will help to yield extreme upward vertical motion and forcing. The combination of strong dynamics, strong forcing, and (to some degree) instability will result in the potential for a low-topped squall line to organize and at least push into western sections.
The line itself likely won't be associated with strong winds, but just out ahead of this line will be the potential for strong-to-damaging wind gusts..as is typically the case in these type of situations. There are some wildcards as to the potential extent of this activity, however, with sfc dewpoints into the 60's this may result in very weak capping aloft, so there is potential for very strong wind gusts not only from convection, but momentum transport.
If the trough was not opening up and lifting to the northeast this would allow for a much stronger surge of CAA in the mid-level. This would be accompanied by steeper mid-level lapse rates and perhaps a much greater threat for widespread severe weather. As t stands now, torrential rainfall and strong/gusty winds look probable; including the risk for some embedded severe t'storms (though we'll have to see if we have enough for lightning generation)