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Boston weather: Heading towards spring

The weather map for Southern New England at 2 p.m. EDT on March 19, 2014. Mostly sunny skies are expected in the morning, with increasing clouds throughout the day.
The weather map for Southern New England at 2 p.m. EDT on March 19, 2014. Mostly sunny skies are expected in the morning, with increasing clouds throughout the day.

Forecast discussion: High pressure over Northern New England helped to give Boston mostly sunny skies today. However, the northeast winds also helped to bring colder air off the ocean into the city. Over the next 48 hours, the high will begin to slip off into the Atlantic, allowing for a low pressure system to shift our winds to the south. We will see warmer temperatures, but also some precipitation Tuesday night into Wednesday morning.

High temperature forecast for March 19, 2014

For tonight, the high will continue to influence our weather, but the clear skies and calm winds will help temperatures fall into the lower 20’s. By Wednesday, winds will begin to turn to the southeast, changing the wind direction to a warmer direction. A warm front will pass through Wednesday night, helping to bring more clouds into our skies. The low’s center will help bring some light rain for Wednesday night. There will be enough warm air throughout the atmosphere to keep the precipitation as rain into Thursday morning. Skies will bring some sunshine after the low passes to our east by Thursday afternoon.

Thursday is the first day of astronomical spring, and it will definitely feel like it. Temperatures will climb into the lower 50’s. Friday will be a tad cooler, but we will have mostly sunny skies to start the day. A quick moving low pressure system will bring some precipitation to the area by early Saturday morning. It will start off as flurries or snow showers, before warmer air arrives and changes it to rain showers. The showers will end by Saturday night.

As we start early next week, temperatures will once again be heading down. Another blast of colder air from Canada will move south and into New England. Temperatures will reach the lower 40’s on Sunday, but we will barely make it above freezing by Monday. Right now, I am watching the models to see what they will do with a developing area of low pressure off the eastern Great Lakes. This low may pass through the Northeast and bring some light snow by next Tuesday night. At this time, the American model is the only model projecting this scenario. For now, my forecast for Tuesday is quite low.

72 hour forecast:

Tonight: Clear skies with a low of 25.
Wednesday: Mostly sunny with clouds increasing through the afternoon. We will see a high of 41 with winds turning to the southeast at 10-13 mph by the afternoon.
Wednesday night: Light rain begins around 11 p.m. with a low of 35. Winds will come from the southeast at 10-13 mph.
Thursday: Showers end by 10 a.m. with partly to mostly sunny skies. It will be milder with a high of 53.
Thursday night: Partly cloudy and a low of 32.
Friday: Mostly sunny through the morning, with cloudy skies by around sunset. We will have a high of 46.
Friday night: Mostly cloudy with some flurries by dawn and a low of 31.

Extended Forecast:
Saturday: Scattered snow showers turn to rain showers by 11 a.m. Precipitation ends before midnight. Highs 45-48, lows 28-31.
Sunday: Partly to mostly sunny. Highs 40-43, lows 21-24.
Monday: Mostly sunny and quite cold. Highs 31-34, lows 19-22.
Tuesday: Partly sunny with possible light snow by the evening. Highs 34-37, lows 22-25.

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