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Boston weather forecast for Apr. 23, 2013

Boston weather forecast for Apr. 23, 2013, Forecast discussion: High pressure gave us one more nice day in eastern Massachusetts, as it slowly moves over Nova Scotia. Some mid-level clouds began to take over our skies this afternoon, and we are beginning to see more clouds than stars outside the weather center. The clouds are due to a low pressure system off the east coast. This low will be hanging around Southern New England for the next few days.

The low will move northward this evening, and we will begin to see drizzle and an isolated shower or two by Tuesday morning. As we move into Tuesday evening, the low will work its way off of Cape Cod, and will become stationary. There will be a lot of precipitation with this low, and the system will become blocked. The high over Nova Scotia will remain in place, so the low will not be able to move eastward. Instead, it will slowly move northward into the Gulf of Maine. The Cape and Islands will see the most precipitation, with 2 inches of rainfall possible. Inland Rhode Island may see about an inch before the low moves north Wednesday afternoon.

We will continue to have some scattered showers come off the water Wednesday evening, before drier air begins to move in Thursday morning. High pressure coming in from the Great Lakes will bring some sunshine Thursday afternoon. At this time, it appears the high will block any other low pressure systems for the first half of the weekend.

However, the long range computer models disagree on how long the high can block all the precipitation. The American and European models agree the high may be able to hold off some shower activity until Sunday, since the high begins to weaken. However, the United Kingdom model keeps the high strong enough to keep any precipitation away until late Monday night. For now, I will keep showers in the forecast, starting Sunday afternoon, before they dissipate off the coastline early Monday morning.

72 hour forecast:

Tonight: Mostly cloudy with a low of 38.
Tuesday: Overcast and windy with an isolated shower and drizzle by mid-morning, with heavier rain midway through the evening commute. Patchy fog may develop during the evening commute. We will see a high of 47 with northeast winds of 16-19 mph.
Fenway Park Forecast (6:35 p.m. vs. Oakland A’s): Scattered showers by the sixth inning, 45.
Tuesday night: Overcast with periods of heavy rain and a low of 42. Winds will come from the north at 14-17 mph.
Wednesday: Rain tapers to showers by mid-morning, tapering to isolated showers by the early afternoon. We may see partly sunny skies in the late afternoon. It will be milder with a high of 65.
Wednesday night: Scattered showers with a low of 43.
Thursday: Showers ending by the early morning, with partly to mostly sunny skies. We will see a high of 59.
Thursday night: Partly cloudy with a low of 41.

Extended forecast:
Friday: Mostly sunny. Highs 59-62, lows 40-43.
Saturday: Partly to mostly sunny. Highs 61-64, lows 41-44.
Sunday: Cloudy with showers by the early afternoon. Highs 61-64, lows 43-46.
Monday: Mostly sunny. Highs 60-63, lows 41-44.

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