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Boston weather, metro north and west: Showers today, clearing late tonight

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At mid morning Friday temperatures continue to hover in the 30s across the forecast area and for that matter most of southern New England. The warm front that was anticipated to move through here early today remains south of the New England south coast this morning leaving the area stuck in a damp and cool easterly flow. Unfortunately, the front will take a good part of the day to reach the Boston area and once it does a cold front will be on its heels as it moves across our area tonight.

The first batch of precipitation that came in overnight has now moved into central and northern New England. The freezing rain threat for the interior has ended as temperatures are above freezing at mid morning. We are left with areas of drizzle and a few spotty showers that remains with us into this afternoon. The second wave of heavier precipitation comes through this afternoon and early this evening as the frontal boundaries approach and make their pass through the area. We could see a few embedded heavy downpours with just a slight chance of thunder later this afternoon. The late day commute may see impacts from standing water to some street flooding due to the afternoon rainfall, snow melt and clogged drains.

The inclement weather Friday is associated with a strong storm moving into south central Ontario and toward Hudson Bay. This system has brought heavy snow and winds to the western Great Lakes and upper Plains, severe weather across the Midwest and South along with locally heavy rains that have caused concern for some flooding in the Midwest. The severe weather threat is expected to remain south of us this afternoon with only locally heavy downpours a possibility.

Once the cold front moves through conditions improve overnight and we can look forward to a fairly nice weekend, by late February standards. With high pressure expanding across the mid-Atlantic during Saturday a southwest flow develops here. Also, the air mass following tonight’s cold front will be relatively mild. This leads to a really nice day on Saturday with temperatures well into the 40s to around 50 degrees.

Another cold front slips by us by midday on Sunday. This will signal the beginning of the cooler air that will become much colder air next week. Sunday turns a bit cooler but still pleasant for this time of year. We are looking at the possibility of a wave of low pressure forming to our west on the slow moving cold front during Sunday which in turn moves just to our south at night. This disturbance could bring a round of light snow Sunday night.

Colder air continues to filter in on the backside of the departing disturbance for Monday and by mid week we flirt with a threat of snow from a coastal storm. This could very well move further south and be a miss so there remains much uncertainty about this potential storm. One thing that is certain will be the colder temperatures through next week.

72 Hour Outlook:

Today: Overcast skies with periods of drizzle and spotty showers into this afternoon. Widespread areas of fog. Numerous showers developing mid to late afternoon with local downpours possible. High temperatures in the mid to upper 40s but not until very late in the day. East to southeast winds becoming south to southeast this afternoon, possibly gusty in any heavy showers.

Tonight: A gusty shower possible with precipitation winding down and ending by 9 pm. Partial clearing after midnight. Areas of patchy fog. Mild early, then cooler. Lows in the low 30s. Gusty southwest winds.

Saturday: Mostly to partly sunny, breezy and mild. High temperatures in the upper 40s to 50 degrees. Southwest winds 10 to 20 mph by afternoon.

Saturday night: Partly to mostly cloudy and cool. Lows in the upper 20s to low 30s. Southwest winds 5 to 15 mph.

Sunday: Partly sunny and not as mild. Highs in the low 40s.

Sunday night: Chance of snow developing. Colder, lows in the 20s.

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