BOX take
Thursday...
Stationary front draped across the region, with cooler air
across northern MA, especially northeast MA with NE winds off
the Gulf of ME. As boundary lifts north, warm sector airmass
surges back across the region from south to north. However as mid level trough moves
across the Great Lakes, combined with stalled frontal boundary
and upper level jet streak across southeast Canada, all the
ingredients for a Predecessor Rainfall Event (PRE). Although,
given how far west best forcing for ascent is located, greatest
risk for heavy rain Thu associated with a PRE is across NY state
into VT.
More showery weather this far east into MA/RI/CT along with some
elevated instability near warm front. Thus, low risk of thunder
and brief heavy rainfall.
Highs 75-80 across CT/RI and southeast MA in the warm sector,
70-75 elsewhere with only upper 60s across northeast MA in the
cool sector.