DAYS 1-5 (MARCH 18-22)
Seasonably cool but nice mid March weather today courtesy Canadian high pressure. But changes are quick to come and tomorrow will be a colder and unsettled day with a period of rain, starting as snow for portions of the region with minor accumulation possible (see below), as a low pressure wave approaches on a frontal boundary that still sits to the south. The passage of this wave will hold the chilly air in the region into the early hours of Friday but that will change in a big way as a stronger low travels from the Great Lakes down the St. Lawrence Valley and helps push much warmer air into the region. This will be accompanied by the chance of rain showers during Friday, and cannot rule out even a thunderstorm as a cold front approaches by Friday evening. This delivers chilly but dry air for the coming weekend.
TODAY: Sun and passing clouds. Highs 48-55. Wind NW 10-20 MPH.
TONIGHT: Clouding over. Lows 25-32. Wind N up to 10 MPH.
THURSDAY: Cloudy. Snow arriving except rain/mix South Coast, with accumulation of a coating to 2 inches possible mainly northwest of I-95 highest amounts hills of north central MA and southwestern NH, then changing to rain in all locations. Highs 43-50. Wind NE 5-15 MPH shifting to SE.
THURSDAY NIGHT: Mostly cloudy. Temperatures steady 43-50 evening, rising into the 50s overnight. Wind SE up to 10 MPH evening, SW 10-20 MPH overnight.
FRIDAY: Mostly cloudy. Chance of rain showers. Highs 63-70. Wind SW 15-25 MPH.
FRIDAY NIGHT: Mostly cloudy with a chance of a shower or thunderstorm early, then clearing. Lows 38-45. Wind W 10-20 MPH, higher gusts.
SATURDAY: Sun and passing clouds. Highs 45-52. Wind NW 15-25 MPH.
SATURDAY NIGHT: Clear. Lows 28-35. Wind NW 5-15 MPH.
SUNDAY: Mostly sunny. Highs 38-45. Wind N 5-15 MPH.
DAYS 6-10 (MARCH 23-27)
We will be vulnerable to unsettled weather at times during this 5-day period being near the border of cold air north and warm air to the south. Too early for specifics. But leaning toward March 23-24 and March 26 as the most vulnerable days for precipitation at this time.
DAYS 11-15 (MARCH 28-APRIL 1)
Look for drier weather much of this period, temperatures trending to above normal, but this remains a low confidence forecast at this point. It will not take much to return us to the pattern expected during the 6-10 day period.