Forecast discussion: At this time, a weak disturbance in the atmosphere is moving through the Mid-Atlantic States. This disturbance may help trigger a shower or thunderstorm for Boston and eastern Massachusetts tonight, before a stronger cold front brings some possible heavy rainfall into Saturday morning.
Due to the disturbance and the slow moving cold front, the National Weather Service has already issued a Flash Flood Watch for western and central Massachusetts until 6 p.m. Thursday afternoon. This stretches south through Norwood, but does not go any further than Brockton. This watch was issued as a slow moving cold front now passing into Ohio will have some strong rainfall and isolated thunderstorms ahead of it. The front will not make it into Southern New England until tomorrow night. But, some areas may see anywhere between an inch to two inches of rain from now into Saturday.
As we head into the weekend, the computer models have been going back and forth on whether this front would remain in the area. The front itself will move offshore, but a new low pressure system will develop south of our area, and help create more showers for Friday. With the American and European models now agreeing on this scenario, I have added showers and rain back into the forecast for Friday. We will see some partial clearing by Saturday afternoon, as the showers end by the morning.
As we head into the weekend, that dominant Bermuda High pressure system that brought hot temperatures to us last week will once again control the weather pattern. We will see temperatures slowly climb back into the upper 80’s by Monday, with the chance at seeing over 90 degrees. We may see a few afternoon thunderstorms on Wednesday, as some tropical moisture from the remnants of Chantal moves towards New England.
Also, Tropical Storm Chantal has dissipated as of Wednesday morning. When the National Hurricane Center sent a Hurricane Hunter to take current observations, they realized the system no longer had an organized center. The last advisory on the system was sent at 5 p.m. Wednesday. The remnants of Chantal were centered about 230 miles east-southeast of Kingston, Jamaica, with maximum wind speeds of 45 mph.
72 hour forecast:
Tonight: Cloudy with possible showers and an isolated thunderstorm, along with patchy fog. We will see a low of 72.
Thursday: Cloudy with light to moderate rain and isolated thunderstorms. We will see a high of 82 with winds from the west-southwest at 9-12 mph.
Thursday night: Scattered showers, periods of rain, and isolated thunderstorms with a low of 67. Winds will shift to the north at 3-6 mph.
Friday: Showers with isolated periods of rain and cooler with a high of 73.
Friday night: Showers and occasional light rain with a low of 64.
Saturday: Showers slowly end by the end of the morning with partly sunny skies by the afternoon and a high of 79.
Saturday: Partly cloudy with a low of 65.
Sunday: Mostly sunny. Highs 82-85, lows 67-70.
Monday: Mostly sunny. Highs 84-87, lows 69-72.
Tuesday: Mostly sunny. Highs 87-90, lows 70-73.
Wednesday: Partly sunny in the morning, with possible afternoon thunderstorms. Highs 88-91, lows 72-75.