Rounds of thunderstorms will move through the region tonight/overnight, a few storms may be severe with heavy downpours.
Showers and thunderstorms are continuing to move into the region ahead of a cold front. These storms have already shown the capability of heavy downpours, and all of western Massachusetts has been placed under a Flash Flood Watch. This will be the pattern heading into the evening: scattered rounds of thunderstorms, some of which may become severe throughout the night.
A sharp cold front is cutting into the hot and humid airmass we've had in place for the last few days (temperature today crept into the lower-90s under mostly sunny skies before the rain arrived). This front will not be clearing western Massachusetts until Monday morning, so the target area for wider-spread severe weather outbreaks on Sunday night will be focused farther off to our west in the Mid-Atlantic, but nonetheless we will be on alert here. We've already seen one storm becoming severe in the Amherst area around 3:15 p.m.
Some leftover rain carries through into the Monday morning commute, but the front will push through and help clear out the skies for the afternoon. We should see plenty of sunshine by time the day is done with highs on Monday comfortably in the mid-80s. Sunny and seasonal weather dominates the next couple of days, with the next chance of rain developing Thursday evening.
Tonight: Scattered thunderstorms, a few storms may be severe, low 69.
Monday: Rain ends early, mostly sunny afternoon, high 85.
Tuesday: Sunny and seasonal, high 84.
Wednesday: Sunny and seasonal, high 85.