DAYS 1-5 (JANUARY 9-13)
High pressure brings fair, cold weather today. A warm front crosses the region Friday with cloudiness and no more than brief light rain/sleet favoring northern MA and southern NH, but more notably starts a significant warm-up, which will peak Saturday night after record-challenging high temperatures during the day Saturday which will not go down much that night. We’ll end up with rain-free conditions for a good part of the warm-up too as the ribbon of rain associated with an approaching frontal boundary will hold off until Saturday night, preceded by only a few rain showers late that afternoon. Low pressure will be heading into the Great Lakes during Saturday, with a strong southwesterly air flow between it and high pressure which will have shifted off the coast and strengthened a couple days after delivering our dry and cold start to this period. But another sprawling high pressure area across eastern Canada, supplying much colder air, will squelch that low pressure area as it attempts to enter Canada, basically turning it into a series of weakening low pressure waves rippling along that frontal boundary, which will sink through here during Sunday. The race between the end of the precipitation and air cold enough to support sleet/ice will be won by the precipitation, so just expected rain to come to an end, then drying as the temperature goes down during Sunday after a very mild start. By Monday, we’ll be in a colder air mass, and it looks dry at this time, but that frontal boundary will not be too far south of the region and some cloudiness may hang about as a result, so not going to go for complete clearing. Forecast details…
TODAY: Sunshine and high clouds. Highs 26-33. Wind NW 5-15 MPH, gusting over 20 MPH.
TONIGHT: Clouding over. Lows 18-25. Wind W up to 10 MPH shifting to S.
FRIDAY: Cloudy with spotty light rain/sleet favoring northern MA and southern NH morning. Mostly cloudy afternoon. Highs 43-50. Wind S up to 10 MPH morning, SW 10-20 MPH afternoon.
FRIDAY NIGHT: Partly cloudy. Temperatures steady 43-50 evening, rising slowly overnight. Wind SW 10-20 MPH, higher gusts.
SATURDAY: Mostly cloudy. Isolated rain showers late-day favoring central MA and southern NH. Highs 56-63. Wind SW 15-25 MPH.
SATURDAY NIGHT: Overcast. Scattered rain showers evening. Rain likely overnight. Lows 50-57. Wind SW 5-15 MPH, higher gusts.
SUNDAY: Cloudy. Rain likely morning. Highs 55-62 morning, falling steadily thereafter to 38-45 by late-day. Wind SW 10-20 MPH and gusty, becoming variable 5-15 MPH, then NW 10-20 MPH.
SUNDAY NIGHT: Breaking clouds. Lows 28-35. Wind N 5-15 MPH.
MONDAY: Partial sun. Highs 38-45. Wind N 5-15 MPH.
DAYS 6-10 (JANUARY 14-18)
Two low pressure systems potentially impact the region in a fast-moving west to east jet stream pattern. Current idea is that the first will be very weak and may pass largely south of the region January 14-15, and that the second one’s low center will pass north of the region with a warm front / cold front combo producing a period of rain then rain showers as it should be too mild to support frozen precipitation January 16-17. Timing and tracks may change and will fine-tune with future updates.
DAYS 11-15 (JANUARY 19-23)
Pattern remains active, but more cold air is going to become available nearby in Canada and we will need to start watching for an increasing risk of ice/snow becoming involved with passing low pressure systems.