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Boston weather: An isolated shower this evening with clearing Saturday

Forecast discussion: A weak disturbance passing into the Northeast U.S. brought a few showers during the early morning in Boston, then remaining overcast for the rest of the day. Some sunshine peaked through the clouds over northern Rhode Island during the late afternoon. As we head into this evening, the disturbance may create an isolated shower, before we see drier air move in during Saturday morning.

As we progress through Saturday, drier air from Canada will begin to filter down into Southern New England. This will be due to a high pressure system passing Newfoundland this evening. The high will slowly move to the east, which will allow for winds to slowly turn from the east and to the southwest. This will help bring in some very tropical air from the Southeast, which is bringing dangerous high temperatures to that part of the country.

Now, we will not see a heat wave, but temperatures will finally reach 80 degrees, starting by Monday. We will keep very warm temperatures until Wednesday. By Thursday, we will begin to see some increasing clouds during Thursday evening. This will be due to a cold front approaching from the west. The forecast calls for showers starting around midnight, and going through the day on Friday. But, the front will move offshore by Friday evening, giving us drier air for the following weekend. However, temperatures will cool to seasonable conditions for the last full week of August.

Meanwhile, the tropics may become active as early as this evening. There is an 80% chance the system moving north of Puerto Rico will become a tropical system within 48 hours. Favorable environmental conditions will improve as the system reaches east of the Bahamas on Saturday. The spaghetti models are showing the track for the system to curve away from the United States by early next week. I will continue to watch the system, and give you the latest information tomorrow night.

72 hour forecast:

Tonight: Cloudy with isolated showers from time to time. We will see a low of 62.
Saturday: Mostly cloudy skies with partial sunshine by the afternoon. We will see a high of 73 with east-northeast winds of 10-13 mph.
Saturday night: Partly cloudy with a low of 61. Winds will come from the north at 7-10 mph.
Sunday: Mostly sunny with a high of 75.
Sunday night: Clear skies with a low of 61.
Monday: Mostly sunny with the humidity slowly rising. We will see a high of 80.
Monday night: Partly cloudy with a low of 62.

Extended Forecast:
Tuesday: Mostly sunny. Highs 80-83, lows 63-66.
Wednesday: Mostly sunny. Highs 83-86, lows 65-68.
Thursday: Mostly sunny with increasing clouds during the evening. Highs 80-83, lows 62-65.
Friday: Showers starting around midnight, but ending around 9 p.m. Highs 77-80, lows 58-61.

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