Forecast discussion: After seeing nothing but cloudy skies on Sunday, we are awaiting a combination of two systems to bring us some potentially heavy rainfall for Monday and into early Tuesday morning. South of Boston, a Wind Advisory is in effect from 3 p.m. to 10 p.m. and extends all the way into Plymouth County. For the Cape and Islands, a High Wind Warning is in effect from 3 p.m. to 11 p.m. This part of Massachusetts will have a low level jet of very strong winds, and any downdrafts from rain or even a thunderstorm could create some power outages.
Right now, a cold front passing into the Great Lakes will receive extra moisture from a low pressure system moving into the Southeast U.S. Radar imagery shows the nearest rainfall passing into south of Long Island. We will see a few showers after midnight, with some heavier rainfall expected by 3 a.m. Heavy rain will continue through Monday morning, as temperatures will reach near 50 degrees. With higher dewpoint temperatures, patchy fog is possible throughout the day.
The Southeast low will move out into Canada by Tuesday morning, and high pressure will take over our weather. But, the high will also bring down some of the coldest air we have seen so far, as temperatures on Tuesday will try to go above 40 degrees. Overnight lows Tuesday night will fall into the lower 20’s.So, make sure if you have your hats and gloves for Wednesday morning.
As we move into the end of the week, the high will keep any storm systems away from Southern New England. Friday and Saturday look dry, but temperatures will remain below normal. On Sunday, we will see more clouds than sun, as a low pressure system over New York brings some showers over us Sunday afternoon. But, the American and European models are in a little disagreement with the location of the low. The European model has the low’s center further west, meaning it may take until late Sunday afternoon or early Sunday evening to receive some showers. Right now, my confidence in the forecast after Saturday night is low.
72 hour forecast:
Tonight: Overcast with showers arriving by 2 a.m. Light to moderate rain expected by 4 a.m. We will see a low of 37.
Monday: Rain through the morning, tapering to showers by 3 p.m. with a high of 50. Patchy fog is expected through the day. Winds will shift to the east-northeast at 8-11 mph before shifting to the south-southeast in the late afternoon.
Monday night: Showers will end just after 1 a.m. We will see a low of 37 with winds shifting to the west-southwest of 14-17 mph with wind gusts of 30 mph.
Tuesday: Mostly sunny skies by the late morning and colder with a high of 41 with wind gusts up to 25 mph.
Tuesday night: Clear skies and very cold with a low of 24.
Wednesday: Mostly sunny and the coldest day of the week with the mercury only rising to 37.
Wednesday night: Increasing clouds with a low of 31.
Thursday: Mostly cloudy and warmer. There is the slight chance for a shower in the afternoon. Highs 42-45, lows 27-30.
Friday: Mostly sunny. Highs 38-41, lows 26-29.
Saturday: Mostly sunny. Highs 37-40, lows 26-29.
Sunday: Partly sunny in the morning, with overcast skies with showers before noon. Highs 44-47, lows 36-39.