Boston Metro North covers the North Shore, Merrimack Valley and Northwest Suberbs:
5 Day Outlook: Get ready for a major change in the weather as we transition to a period of much cooler weather, lasting through the weekend. At least two, and perhaps three, low pressure systems will impact our area during the next five days.
Low pressure moves from the Ohio Valley towards New England on Wednesday. This is a relatively weak system that brings a period of showers during Wednesday into the evening….A stronger storm will quickly move in on Thursday. Rain, possibly heavy at times, will be here throughout the day. Later Thursday and Thursday night, the rain mixes with or changes to a period of snow inland, roughly west of I-95. This would mean areas along the Merrimack Valley and Northwest Suberbs, especially along Route 495, have the best chance of seeing the changeover to snow….It is possible that snow mixes in all the way to the coast. Any accumulation is unlikely, but cannot be entirely ruled out. This all clears out by sunrise on Friday, as skies become partly sunny, with a shot of cold air overspreading the region during the day.
With a stalled front offshore another low pressure system is likely to develop by Saturday and could ride along the front up the coast. This is not a certainty, as it could move out to sea underneath New England. If the storm moves up the coast, with colder air in place, we have to think about a cold rainstorm on the coast, with the possibility of rain/snow inland, changing to all snow over inland sections, especially along the Route 495 communities. This bears close watching and since the event is several days away we have plenty of opportunity to update the forecast as we get later into the week. If the storm does impact us, it will likely be later on Saturday into early Sunday.
Needless to say the temperatures during this five day period will run well below normal.
Live Regional Radar: http://images.intellicast.com/WxImages/RadarLoop/hfd_None_anim.gif
Wednesday Night: Cloudy and chilly, with occasional light showers. Lows in the upper 30’s inland to the low 40’s on the coast. North winds around 5 mph.
Thursday: Rain, possibly heavy at times and chilly. Snow may mix in throughout the Merrimack Valley and Northwest Suberbs during the afternoon. High temperatures in the low to mid 40’s. Winds north 10 to 15 mph, with gusts to 25 mph in the afternoon.
Thursday Night: Rain on the coast, possibly mixing with a bit of snow. Rain and snow mixed inland, likely changing to all snow before ending after midnight. Cold, lows in the low to mid 30’s. Winds north 10 to 20 mph. Up to 1″ of snow possible inland.
Friday: Rapid clearing early, with skies remaining mostly sunny. Cool and breezy, with high temperatures in the mid to upper 40’s. Northwest winds 12 to 20 mph, with higher gusts possible.
Friday Night: Mainly clear skies and cold. Possible freeze inland and patchy frost on the coast. Lows ranging from the mid 30’s on the immediate coast to the upper 20’s inland.
Saturday and Saturday Night: Increasing cloudiness with a chance of rain developing during the afternoon. Possibly mixing with and changing to snow at night inland, except a rain/snow mix on the coast. Highs in the low to mid 40’s. Lows dipping to the low to mid 30’s.
Sunday: Precipitation ends early followed by partial clearing. Remaining chilly, with highs in the upper 40’s.