DAYS 1-5 (MARCH 31 – APRIL 4)
High pressure provides a bright start to the day today, but it will be a cold early morning as we had a clear sky and much less wind during the night, allowing for an efficient temperature drop. Clouds advance into the region by midday and thicken up this afternoon as a warm front approaches from the west, and this front will send a shield of precipitation across the region from late in the day into this evening – mainly rain, but may start as some wet snow and/or sleet mainly in the Route 2 corridor and Merrimack Valley through southern NH. Any frozen precipitation that does occur will not impact the roads with any icy conditions, however, as temperatures will remain above freezing and roads will just be wet. The main rain shield, accompanied by areas of drizzle and fog, will leave the latter two elements behind as it exits later this evening and the warm front passes the region. During our time in the warm sector Saturday, we’ll first see a slug of rain and embedded heavier showers move through during morning to midday, followed by a dry slot and rain-free conditions during the afternoon hours, during which some clearing will take place, however this may not reach the South Coast & MA South Shore until nearly sunset early in the evening. Less sun and a southwesterly wind, quite gusty, will limit temperature rise in those areas, but to the north and west where we have far less marine influence from southwest wind and more sunshine, look for 60+ high temps. We won’t be done with the rain threat yet, however. As its parent low still moves by to our north, a strong cold front will cross the region from west to east Saturday evening, accompanied by showers and possible thunderstorms. The thunderstorm threat will be greatest further west, in areas that received better heating and sit under a more unstable atmosphere, where some strong wind gusts and small hail may occur. This activity should fade in intensity as it moves eastward, then exits the coastal areas later in the evening. Dry, much cooler air then follows this overnight, and sets us up for a bright but blustery Sunday – similar to yesterday’s weather but maybe not quite as chilly. High pressure then builds in for dry and more tranquil weather Monday, with a cold start and a milder finish. But a weak colder front moving into the region Monday night may bring a few rain showers and set us up with a slightly cooler day on Tuesday as winds turn northeast to east behind the boundary, although cooling will be limited due to a weak delivery and an upper high pressure ridge in place.
TODAY: Sunny start, cloudy finish. Late-day rain reaching central MA and southwestern NH which may be mixed with some wet snow and/or sleet. Highs 43-50. Wind variable up to 10 MPH.
TONIGHT: Cloudy. Rain likely this evening. Areas of fog/drizzle. Temperatures steady 43-50 during the evening, rising slightly overnight. Wind SE up to 10 MPH shifting to SW 5-15 MPH with higher gusts.
SATURDAY: Cloudy with rain and embedded heavier showers morning. Clearing southern NH, northeastern CT and central through northeastern MA into Metro Boston during the afternoon while clouds hang on to the southeast with some partial clearing in those areas possible by evening. Highs 52-59 South Coast, 60-67 elsewhere. Wind SW 10-20 MPH with gusts 25-35 MPH, except 20-30 MPH with gusts 35-45 MPH Cape Cod & Islands.
SATURDAY NIGHT: Mostly cloudy evening with rain showers and possible thunderstorms including some heavy downpours, even some small hail possible with any heavier storms favoring southwestern NH, central MA, and northeastern CT. Clearing overnight. Lows 35-42. Wind SW 10-20 MPH, higher gusts, shifting to NW overnight.
SUNDAY: Sun and passing clouds. Highs 42-49. Wind NW 15-25 MPH, gusty.
SUNDAY NIGHT: Clear. Lows 30-37. Wind NW 5-15 MPH, gusty.
MONDAY: Sunny. Highs 51-58. Wind W 5-15 MPH.
MONDAY NIGHT: Variably cloudy. Chance of a rain shower. Lows 41-48. Wind W up to 10 MPH shifting to N.
TUESDAY: Partly sunny. Highs 49-56, coolest coast. Wind NE to E up to 10 MPH.
DAYS 6-10 (APRIL 5-9)
A broad low pressure area is expected to travel into the Great Lakes via the Midwest early in the period and a frontal boundary in our area extending from this will likely bring lots of cloudiness and possibly some wet weather to start the period. Eventually the low will make its way through eastern Canada and deliver a dry, cool air mass to our region around mid period, followed by continued fair weather but with a warm-up late in the period. This remains a lower confidence forecast at this time with fine-tuning to come.
DAYS 11-15 (APRIL 10-14)
A cooler and more unsettled pattern arrives heading into mid April.