Metro Boston, North Shore and metro west: High pressure begins to pull offshore as a cold front is poised to move through the area late today. As of late this morning the cold front is positioned across western New York State with showers out ahead of the front through the central and eastern sections of the Empire State into Vermont. These showers are expected to weaken as they move eastward.
With the advancing cold front will come an increase in clouds and a slight chance of a few widely scattered showers later in the day. Most of you will likely stay dry as this front will not have a lot of moisture with it by the time it arrives in eastern Massachusetts. The more important factor with the front is that it will open the door for the coldest air of the season to flood into the Bay State. The core of the cold air will be with us Wednesday into the coming weekend. It might be a bit of a shock given the splendid weather we have had for weeks on end. Before the front arrives we remain in a southwest flow, keeping temperatures on the mild side for one more day. Highs on Tuesday climb into the mid and upper 60s. Enjoy it because the mercury will not get anywhere near there through the remainder of the week. A gusty southwest breeze at times.
Skies partially clear Tuesday night behind the front and temperatures fall back into the 30s throughout the area, probably around 40 on the coast. Winds west to northwest at 5 to 15 mph, with some higher gusts in the evening hours.
A low pressure system to our south will be tracking along the frontal boundary and will spread clouds and the possibility of a period of cold rain into the region later Wednesday and Wednesday evening. There are still mixed signals from computer models to the exact track of this system, but as of Tuesday morning it appears the storm will pass close enough so we should be just on the edge of the precipitation shield. Areas south of Boston have a better chance of rain given those locations will be closer to the storm. With the cold air overrunning the area high temperatures on Wednesday will struggle just to get into the low 50s and with a brisk north wind it will be a chilly and raw day for sure.
As the storm pulls away skies partially clear Wednesday night and it will be cold with lows pushing back into the 30s.
Thursday and Friday will feature very chilly temperatures, gusty winds and skies ranging from mostly clear in the morning, partly to mostly cloudy in the afternoon. A sprinkle cannot be ruled out each afternoon or evening. Overnight, partly cloudy skies and cold. Highs both days in the upper 40s to low 50s. Lows in the low to mid 30s. Those numbers represent temperatures that are at least 10 degrees below normal.