Low pressure in the eastern Great Lakes on Saturday morning will slowly move across New England Saturday and early Sunday, then cross into the Canadian Maritimes Sunday night. A stalled frontal boundary will set up across central or northern New England, with our area being on the warm and humid side of the front. Another low pressure system will drag a cold front through western Massachusetts very late Monday night or Tuesday morning.
The final weekend of the summer vacation season is here. We have a threat for showers and thunderstorms each of the next four days but there are going to be periods of brighter skies as well. Unfortunately the timing of showers and storms is very tricky. Most likely the greatest threat for shower activity is in the afternoon and evening hours Saturday and Sunday, then with the cold front approaching on Labor Day we could see more numerous shower and storm activity, which will probably last into Tuesday as well.
On the flip side we can expect periods when the skies become brighter with breaks of sunshine developing. The best chance for this is during the midday to mid afternoon hours on Saturday and Sunday. It will also be quite humid through the weekend as we are in a moist south to southwesterly air flow until the cold front arrives. On the backside of the cold front it becomes drier and less humid by late in the work week.
Four Day Outlook:
Tonight: Turning muggy, chance of a late night shower. Mild temperatures with lows in the mid to upper 60s. Light southwest winds.
Saturday and Saturday night: Mostly cloudy, chance of an early shower, followed by occasional sunshine. Chance of late afternoon and evening showers and thunderstorms. Areas of patchy fog at night. Warm and humid, with highs in the low 80s, overnight lows in the mid to upper 60s. South to southwest winds 8 to 15 mph, diminishing at night.
Sunday and Sunday night: Mostly cloudy, chance of showers and thunderstorms. Areas of patchy fog late night and early morning. Warm and Humid. Highs in the low to mid 80s. Lows in the upper 60s to 70 degrees.
Labor Day and Monday night: Numerous showers and thunderstorms. Patchy fog in the morning. Continued humid. Highs near 80. Lows in the mid to upper 60s.
Tuesday: Considerable cloudiness early, then becoming partly cloudy. Chance of showers and thunderstorms. Highs about 80.