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Boston Weather: 36.0°F | Mostly Cloudy

Weather: Rain's Plain

Weather

Rain's Plain

By Gerard Roe
Staff Meteorologist

Finally we are going to break the pattern of weekend cyclones with a midweek storm that threatens heavy rain for most of the east coast. The weather is being driven by a strong upper level trough ploughing across the country. Such an upper level configuration often presages surface development and this situation is no different.

Two cyclones -- one in central Canada and the other in the deep South -- will merge Tuesday to form one large system aligned nearly north-south, producing strong moisture-supplying southerly winds ahead of the cold front. Middle- and high-level clouds in the morning auger the precipitation to come. Light rain is likely during the afternoon, becoming heavier by evening and continuing through the night with totals of around an inch. As the lower half of this system swings out into the Atlantic we will be left with strong northwesterly winds in its wake. Blasting out of central Canada, this will be the coldest air of the season. There is the possibility that the higher parts of western Massachusetts may see a few flurries in the wash of the cold front. There is one positive aspect to the frigid air: it is substantially drier.

In the longer term, the cold temperatures are likely to be flushed out, but only briefly, on Friday as a succeeding cyclone threatens the east coast once more over the Veterans Day weekend.

Today: Mostly cloudy early, then overcast. Light rain starting during the afternoon becoming heavier by evening. Winds south or southwesterly and peaking in the afternoon around 20 mph (32 kph). High late in the day of 54F (12C).

Tonight: Moderate or heavy rain. A clammy night. Low 50F (10C).

Wednesday: Chance of rain early. Cold front passing early morning then partial clearing. High around 46F (8C). Low will be below freezing in the west, in Boston it will be nearer 34F (1C).

Thursday: Cold but fair. High 45F (7C). Low 30F (-1C).