7:24AM
DAYS 1-5 (NOVEMBER 12-16)
Get ready for a temperature crash! But before that, we have some fog, some rain, and a bit of snow to get through. No, not big snow – not even close. But there is one tweak to the forecast today and that has to do with timing and moisture. As the cold front passes today, many areas will mix with and change to snow, and accumulation will be very minor – under 1 inch on grassy surfaces and car tops, and maybe a slushy trace on cemented or paved areas that are cold enough. The change has to do with a surge of moisture coming up behind the front just enough to keep the snow going a little longer as it gets dark over parts of southeastern MA and Cape Cod for a better chance of a coating of snow there, and a little less time for surfaces to dry off tonight as the temperature really falls. So those same areas may see a little more coverage of frozen puddles and black ice heading into Wednesday morning. Anywhere that does experience that will see it dry/sublimate due to very dry air and windy conditions through Wednesday, a day that will feel much more likely January than the middle of November. But things change quickly around here, and even though Thursday will be a very chilly day too, it will begin to moderate a bit with much less wind, and with high pressure slipping off to the east as well, an increase in moisture should lead to a few more clouds than previously indicated. Another minor tweak for this forecast is the removal of the rain shower risk for Friday, leaving just some clouds in as a cold front approaches and passes. That day itself will be milder, but a quick shot of cold air will follow this for Saturday as high pressure moves across the Upper Great Lakes into southeastern Canada.
Forecast details…
TODAY: Cloudy. Areas of fog morning. Rain overspreading the region west to east morning, ending as mix/snow west to east mid afternoon to early evening with minor accumulation (under 1 inch) in some locations, favoring unpaved surfaces. Highs 41-46 I-495 belt northwest of Boston, 47-52 Boston-Providence corridor, 53-58 to the southeast morning and midday, with a sharp drop west to east during the afternoon. Wind variable up to 10 MPH, becoming NW and increasing to 10-20 MPH with higher gusts, especially north and west of Boston, from west to east during the afternoon.
TONIGHT: Clearing. Areas of black ice on many surfaces that have not dried off or been treated. Lows 15-20 except 20-25 Cape Cod. Wind NW 15-25 MPH, higher gusts. Wind chill often below 10, approaching 0 at times.
WEDNESDAY: Mostly sunny. Highs 25-32 except 33-38 Cape Cod. Wind NW 15-25 MPH, higher gusts. Wind chill frequently below 20.
WEDNESDAY NIGHT: Clear. Lows 15-22 except 23-28 Cape Cod. Wind W 5-15 MPH. Wind chill below 10 at times.
THURSDAY: Sunny to partly cloudy. Highs 35-42. Wind W up to 10 MPH shifting to S.
THURSDAY NIGHT: Partly to mostly cloudy. Lows 25-32. Wind S up to 10 MPH.
FRIDAY: Variably cloudy. Highs 43-50. Wind S up to 10 MPH, shifting to W 10-20 MPH.
FRIDAY NIGHT: Clearing. Lows 22-30. Wind NW 10-20 MPH.
SATURDAY: Mostly sunny. Highs 33-40. Wind NW 10-20 MPH.
DAYS 6-10 (NOVEMBER 17-21)
High pressure protects the region with dry weather and a slight temperature moderation to finish off the weekend November 17. The November 18-21 period is a little more tricky as we will have high pressure to the north, low pressure to the south, and there will be a bit of a battle between the two. The weather here can range from fair, to cloudy, to wet. It will be a more moderate temperature pattern so we would not likely have any frozen precipitation to worry about, just rain, but at this point I’m giving the edge to the high pressure area to the north keeping most of the wet weather south. It may not be as successful holding the clouds off, which may also be added to by an air flow off the Atlantic. But it’s early to go into any more detail than that. Just keep in mind the potential scenario which will be fine-tuned.
DAYS 11-15 (NOVEMBER 22-25)
A return to a zonal (west to east) flow pattern with up and down temperatures, averaging near to slightly above normal overall, and a couple brief precipitation threats, mainly passing rain showers, depending on the timing of disturbances.