While a cold front will be approaching from the north and west tomorrow we will also be watching a back door front to our north as this back door front will make for some very intriguing temperature differences for tomorrow. Areas across northern/eastern MA/RI...even extreme northeast CT could struggle to get out of the upper 50's or so while areas just a bit to the SW across the rest of CT could once again get into the lower 70's or so.
With the main cold front slowly sagging southeast, a wave of low pressure will ride along the front and this will be responsible for the development of showers and isolated thunderstorms tomorrow afternoon and evening. The best timeframe for showers and t'storms appears to be anytime after 4 PM with the potential lasting through much of the overnight hours.
With fairly low freezing levels, a decent amount of 0-3km helicity, and high vertical shear values, it's possible a storm or two could contain some small hail or even some gusty winds. The best potential for this appears to be south of the MA Pike and especially into CT. There will be some weak surface instability present along with some weak elevated instability which could be just enough fuel to create some stronger cores in some of the storms that develop.
