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Boston weather: Much cooler temperatures for Tuesday

The weather map for Southern New England at 2 p.m. EDT on May 13, 2014.
The weather map for Southern New England at 2 p.m. EDT on May 13, 2014.

Forecast discussion: Boston had one of those days on Monday you just want to save in a bottle, so it can be opened again for some cold day in the middle of February. The official high temperature at Logan Airport was 85 degrees. Unfortunately, over the next few days, temperatures will be about 20 degrees cooler.

High temperature forecast for May 13, 2014

So, why are we going to see such a drastic change in temperature? The reason is called a back door cold front. Typically, cold fronts come either from the west, and helping to move other weather systems. This type of front is actually coming down from Northern New England, and then from the east. Also, with the winds shifting to the east, this will help bring winds off the cooler ocean waters. Although our dewpoints will be relatively low, the air will become more humid over the next few days. So, temperatures over the next few days will struggle to reach the middle 50’s to lower 60’s.

For Tuesday, there is the slight chance for an isolated shower, with a slightly increased chance for some passing showers on Wednesday. A new cold front in the middle of the country right now will help bring the increased risk for showers on Thursday. As the front reaches the east coast, a new low pressure center will form in the Southeast U.S. along the front. This low will help bring more moisture, along with some upper level dynamics. This will also make our dewpoint temperatures close to the air temperatures. So, we may see some patchy to dense fog, especially during the evenings. By Friday night, we will be seeing some heavy rainfall and some scattered thunderstorms Friday night into Saturday morning. As the cold front moves offshore, rainfall will taper off, and end by early Saturday evening.

The dewpoint temperatures will also decrease, allowing for some drier air to move over the region by the weekend. We will see partly to mostly sunny skies to start early next week, but high temperatures will remain in the middle to upper 60’s.

72 hour forecast:

Tonight: Mostly cloudy with a low of 53.
Tuesday: Partly sunny and cooler with a high of 56. Winds will come from the east-northeast at 10-13 mph.
Tuesday night: Mostly cloudy with isolated showers by 4 a.m. and a low of 46. Winds will come from the east-southeast at 4-7 mph.
Wednesday: Overcast with scattered showers by the morning commute. We will see a high of 63.
Wednesday night: Scattered showers with a low of 59.
Thursday: Scattered showers with a high of 73.
Thursday night: Scattered showers with a low of 62.

Extended Forecast:
Friday: Mostly cloudy with showers during the day. Moderate to heavy rain and scattered thunderstorms expected by the evening. Highs 67-70, lows 56-59.
Saturday: Heavy rain and thunderstorms in the morning, tapering to showers in the afternoon, before ending in the early evening. Highs 65-68, lows 53-56.
Sunday: Partly sunny. Highs 65-68, lows 52-55.
Monday: Partly to mostly sunny. Highs 64-67, lows 53-56.

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