A warm west and southwesterly flow of air developed Tuesday afternoon and evening and persisted through the overnight hours, transporting a surge of abnormally mild air into the region. Temperatures climbed through the 60s overnight and are in the lower and middle 70s as of Wednesday morning. Were it not for an approaching cold front, it’s likely that temperatures would soar into the 80s today.
That cold front is currently dropping southward into northern parts of Massachusetts and will continue its journey through Southern New England this morning. Short-term model guidance puts the boundary over the Cape during the midday hours, with a drop in temperatures and a wind shift to the north and northeast expected with its passage – beginning near Provincetown late this morning and last near Woods Hole early this afternoon.
To the north of the front, much cooler air is surging southward from Canada and this airmass will engulf our area this afternoon and tonight and remain in place tomorrow (and be reinforced later Friday and into Saturday). As a result, temperatures climbing through the 70s this morning (with a humid feel to the air) will level off during midday and then start a noticeable shift downward thereafter…falling back through the 60s through the afternoon hours and eventually dropping down into the 50s after dark.
In addition to the falling temperatures, this morning’s partial sunshine will lose out to advancing cloud cover with shower activity becoming more probable during the second half of the day.