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Boston Weather: 41.0°F | Mostly Cloudy

Weather: Who Says You Have to Go With the Flow?

By David Flagg
STAFF METEOROLOGIST -- After a fairly pleasant start to the work week, the weather will start to head downhill for Boston on Wednesday. A mature cyclone over the Midwest will move eastward during the day on Tuesday, spreading showers and thunderstorms from the Gulf Coast through the Great Lakes. As the storm approaches New England on Wednesday, it will amplify the southerly winds already in place due to the exiting high pressure center over the Canadian Maritimes. However, it will also spawn the development of another cyclone off the coast of the mid-Atlantic. This is a phenomenon in meteorology known as a “cut-off low” because it is a cyclone that detaches from the jet stream, along which most cyclones travel. Cut off from the “steering winds” that guide most cyclones, its speed and motion are often unpredictable, making the forecast difficult for the end of the week. Currently, it looks like the front will affect our area from late Wednesday into Thursday and the cut-off low will take over on Friday and possibly into the weekend. Be sure to check Friday’s issue for an update.

Extended Forecast

Today: Partly sunny. High 50°F (10°C).

Tonight: Increasing clouds. Low 43°F (6°C).

Tomorrow: Cloudy with showers possible by evening, windy and mild. High 59°F (15°C).

Tomorrow night: Rain developing. Low 51°F (11°C).

Thursday: Overcast with rain likely. High 57°F (14°C).

Friday: Continued overcast with rain likely. High 56°F (13°C).