The warm, moist air that is
advected into SNE during the day on Wednesday behind a warm front
will lead to much more humid conditions and destabilization,
especially for areas south of a Hartford-Worcester-Boston line. This
is because hi-res guidance is indicating a weak shortwave and cold
front ahead of the main front which may keep dewpoints lower in
northwest/north central MA as it stalls overhead. Convergence
associated with this boundary may be the focus for a few isolated
thunderstorms Wednesday evening ahead of the main line, but the bulk
of the action should be overnight, between 8pm and 4am as the cold
front crosses the region.