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Boston Weather: 34.0°F | Mostly Cloudy

Weather: Weather Marches On

By Greg Lawson

There is a strong upper level cut-off low above the surface low to our northwest. The surface low has already occluded, is producing measurable precipitation, and is moving northeastward. The upper level cyclone’s winds are strong enough to be felt here at the surface, and they are blowing favorably to have brought some of the drier air to our southwest up into the system. This has in effect protected us from rain this morning, whereas only a hundred miles or so to our north, west, and east they are receiving rain. Some of the cloudiness will diminish as the day progresses.

We cannot expect to be so lucky this whole week however. After a brief period of relatively clear skies due to the huge high pressure center to our southeast just off the east coast, a fast approaching short wave from the mid-west will clobber us with some precipitation Wednesday evening on into early Thursday afternoon. It may be cold enough when the precip begins to see some snow, but it will certainly trail off into rain. The short wave shows the potential to really deepen as it crosses the US. This could mean we will receive fairly heavy rain and gusty winds. After its passage, the clouds will clear up slowly and we will be left with a pleasant period beneath high pressure.

Tuesday: Overcast then clearing. Moderate westerly winds. High 47°F (8°C).

Tuesday Night: Clear then clouding up. Winds shift to southerly. Low 32°F (0°C).

Wednesday: Steadily increasing clouds during day. Winds pick up and shift to southwesterly. Precipitation beginning in the evening. Perhaps snow at first but definitely ending in rain, heavy at times. High 50°F (10°C). Low 38°F (3°C).

Thursday: Rain tailing off late morning/early afternoon. Clouds slowly dissipate. High in the mid 40°s (6 to 8°C).

Friday Outlook: Partly cloudy. High in the mid 40s (6 to 8°C).