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Boston weather: Possible showers, thunderstorms Monday afternoon

Forecast discussion: High pressure centered over western Ohio at the moment gave Boston a beautiful end to the weekend. We had bright sunshine through the morning and early afternoon. However, a weak disturbance helped to bring increasing clouds by the late afternoon to the capital city. But, there is not enough moisture through the entire atmosphere for any showers.

This high will continue to give eastern Massachusetts dry weather for a better part of the day. However, an approaching cold front from Canada, along with a stationary front near eastern Maine, will create enough upper level dynamics for a passing shower or thunderstorm by the middle of the afternoon. The bad news is this front over Maine will give us unsettled weather for the rest of the week.

We will see a series of low pressure systems rotate in a counter-clockwise motion off the coast off this front. This means the low will keep bringing in moisture off the waters. A low now passing over the western Rockies will bring the potential of some heavier rainfall by early Thursday evening. Temperatures will remain seasonable into Wednesday, but cooler air from an upper level low over the region will have our high temperatures fall into the lower 60’s by the end of the week.

As we head into the holiday weekend, temperatures will slowly increase back to seasonable conditions. Also, the series of lows will finally move offshore by early Saturday morning. But, some upper level dynamics may create a return of showers by Saturday afternoon. High pressure over the Tennessee River Valley will finally bring drier air and mostly sunny skies by next Sunday.

72 hour forecast:

Tonight: Partly to mostly cloudy with a low of 49.
Monday: Partly to mostly sunny with an isolated shower or thunderstorm by 3 p.m. We will see a high of 68. Winds will come from the west-northwest at 11-14 mph.
Monday night: Mostly cloudy with a possible shower or thunderstorm after 9 p.m. We will see a low of 52 with northwest winds of 7-10 mph.
Tuesday: Mostly cloudy with scattered showers and a high of 69.
Tuesday night: Showers ending by midnight with a low of 52.
Wednesday: Cloudy with showers arriving by 3 p.m. We will have a high of 69.
Wednesday night: Showers with a low of 55.

Extended Forecast:
Thursday: Overcast with showers and heavier rainfall by the evening. Highs 60-63, lows 50-53.
Friday: Moderate rain until mid-morning, before tapering to showers the rest of the day. Highs 61-64, lows 51-54.
Saturday: Showers end by the early morning, with partly sunny skies and the chance for more showers by the early afternoon. Highs 65-68, lows 52-55.
Sunday: Showers end by midnight, with mostly sunny skies. Highs 69-72, lows 52-55.

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