Forecast discussion: A low pressure system that passed off east of Cape Cod on Tuesday is now heading into the Canadian Maritimes, allowing for drier air to move over the state. We will have clear skies over Boston tonight, with mostly sunny skies during the daytime hours on Wednesday. We will see increasing clouds Wednesday evening, ahead of a low pressure system now moving into Illinois.
By early Thursday morning, a warm front will begin to move through Southern New England, with showers arriving just before lunchtime. By the evening, we will see heavier precipitation, which will continue into Friday. We will see temperatures drop through the day, as a corresponding cold front will push through during the early evening. The precipitation will remain as rain despite colder temperatures Friday evening. All showers and drizzle will end by Saturday morning, as a strong high pressure system brings drier air to the region into Sunday.
The computer models continue to forecast a scenario where a low pressure system develops over the Tennessee River Valley by Saturday night. A secondary low will form just off the east coast on Sunday. The warm front will stay to our east, meaning our temperatures will slowly creep into the lower 40’s on Monday. Therefore, for Sunday night, we may see some frozen precipitation, in the form of sleet and freezing rain. By Monday morning, enough warm air will be in the atmosphere to change the precipitation to all rain. Then, the cold front will pass through Monday evening. We may see the precipitation change back to a wintry mix into the mid-morning hours of Tuesday, before ending as rain showers Tuesday afternoon. However, this scenario is still about 5 days away, so we will continue to monitor the models, and update you on any changes to the low’s forecast track.
72 hour forecast:
Tonight: Clear skies with a low of 34.
Wednesday: Mostly sunny in the morning with increasing clouds during the evening. We will see a high of 47 with west-northwest winds of 5-8 mph.
Wednesday night: Mostly cloudy with a passing shower before 3 a.m. and a low of 38. Winds will shift to the east-southeast at 3-6 mph.
Thursday: Showers arrive before noon and milder with a high of 53.
Thursday night: Showers with periods of light rain at times with a low of 47.
Friday: Overcast with light to moderate rain and a high of 51.
Friday night: Showers/light rain and colder with a low of 35.
Saturday: Showers ending by the morning. Partly cloudy skies expected by the afternoon. Highs 38-41, lows 25-28.
Sunday: Mostly sunny during the day, with increasing clouds in the evening and sleet/freezing rain before midnight. Highs 34-37, lows 27-30.
Monday: Sleet/freezing rain changing to all rain before dawn, with showers ending by the late evening. Highs 40-43, lows 30-33.
Tuesday: Mix of rain and snow before all precipitation ends in the early afternoon. Highs 39-42, lows 25-28.