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Boston weather: Moving closer to spring

The weather map for Southern New England at 2 p.m. EDT on March 18, 2014. Mostly sunny skies are expected.
The weather map for Southern New England at 2 p.m. EDT on March 18, 2014. Mostly sunny skies are expected.

Forecast discussion: We had the chance to see some snow from a low pressure system that formed over the Mid-Atlantic Monday afternoon. However, thanks to high pressure over eastern Canada, it kept the low to our south, giving Washington D.C. six inches, and closing down the federal government. The high will protect us into the middle of the week. Spring will be arriving, but the weekend will feel more like January.

High temperature forecast for March 18, 2014

For this evening, the high will settle to our north, allowing for clear skies and calm winds. This will allow temperatures to free fall into the middle teens. This is well below normal for this time of the year. As we move into Tuesday, we will have bright sunshine with temperatures just reaching freezing. We can thank northeast winds coming off the water for keeping temperatures so cold. It will be a little warmer tomorrow night, with lows in the middle 20’s.

We will begin Wednesday with sunshine, but the high’s center will begin to move offshore. A low pressure system moving across eastern Canada will provide us with some showers by Wednesday evening. There will be enough warm air in the atmosphere to keep it as rain showers into the middle of Thursday morning. We will have spring arrive by 12:57 p.m. It will also be the warmest day of the week, as highs climb into the lower 50’s.

By Friday, a new cold front will bring some colder air from Canada back into New England. It will be cold enough for the precipitation to be snow showers before midnight on Friday. By the time we reach the middle of Saturday morning, it will change to rain showers, and remain this way until it ends Saturday evening. After the cold front passes, Arctic air will rush back over the region, and our high temperatures will be well below normal. We will see partly to mostly sunny skies for the start of next week, but temperatures will make it feel more like January than the last full week of March.

72 hour forecast:

Tonight: Clear skies and very cold with a low of 15.
Tuesday: Mostly sunny with a high of 33. Winds will come from the east-northeast at 7-10 mph.
Tuesday night: Partly cloudy with a low of 25. Winds will come from the northeast at 6-9 mph.
Wednesday: Mostly sunny with clouds increasing in the afternoon. Showers will be possible by 9 p.m. We will see a high of 40.
Wednesday night: Scattered showers with a low of 35.
Thursday: Showers end by 9 a.m. with partly sunny skies. It will be milder with a high of 53.
Thursday night: Partly cloudy and a low of 33.

Extended Forecast:
Friday: Mostly sunny in the morning, with mostly cloudy skies by the early evening. Some possible snow showers arrive by 10 p.m. Highs 45-48, lows 30-33.
Saturday: Snow showers turn to rain showers by 9 a.m. Highs 47-50, lows 28-31.
Sunday: Partly to mostly sunny. Highs 38-41, lows 19-22.
Monday: Partly to mostly sunny. Highs 32-35, lows 17-20.

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