Boston metro north covers the North Shore, Merrimack Valley and Northwest Suburbs:
The National Weather Service has issued a Winter Storm Warning for our area. This warning is in effect through Thursday afternoon to 6 pm. Accumulations of 6 inches or more of snow is possible inland, with lesser amounts closer to the coast. The timing of this storm will impact the Wednesday evening commute and the Thursday morning commute.
High pressure keeps us dry and cool into Wednesday morning. The high moves offshore early on Wednesday as low pressure in the Great Lakes expands toward New England. The onset of precipitation will be during Wednesday afternoon, with mostly snow but a chance of rain and snow on the coast. Snow will prevail everywhere on Wednesday night.
A secondary coastal low is expected to develop south of Long Island early Thursday. This will become the main feature for Thursday and responsible for extending the period of precipitation through a good portion of the day. Mainly snow, with a mix of rain and sleet possible along the coast.
As the coastal low pulls away Thursday night everyone probably changes back to snow as the precipitation winds down.
Expected snowfall amounts: 2 to 4 inches east of Route 95 toward the coast, 3 to 6 inches along Route 95 and west, with 5 to 9 inch amounts possible through the Route 495 belt from the Merrimack Valley into the suburbs northwest of Boston. I caution you to do three things here. The first is to realize this is a difficult forecast and these totals may change. The second is to look at both the low numbers and high numbers on the snow forecast totals, not just focus on the high numbers. Last, a few miles can make a big difference in snowfall amounts. These snowfall amounts are for snowfall through Thursday evening.
Friday looks to start out with lots of clouds and chance for flurries or some drizzle, especially near the coast. Mostly cloudy skies prevail through the afternoon.
A potent low will move northward through the Great Lakes on Saturday. This will spread another round of precipitation into the area Saturday, most likely in the form of rain showers, as the associated cold front slides through here sometime on Saturday.
Regional live radar: http://images.intellicast.com/WxImages/RadarLoop/hfd_None_anim.gif
WEDNESDAY NIGHT: Periods of snow, with areas of fog. Lows 28 to 32. Winds east 10 to 15 mph.
THURSDAY: Snow, possibly mixing with rain and or sleet along the coast. Highs 33 to 37. Winds east to northeast 12 to 22 mph.
THURSDAY NIGHT: Mainly cloudy skies, with precipitation winding down. Snow showers may continue through midnight. Lows 24 to 28. Winds backing to north and northwest 10 to 20 mph.
FRIDAY: Chance of flurries or drizzle early, otherwise mostly cloudy and chilly. Highs 36 to 40.
FRIDAY NIGHT: Mostly cloudy. Lows 30 to 35.
SATURDAY: Cloudy skies, with periods of showers likely. Milder, with highs 42 to 46.