Forecast discussion: A low pressure system went through eastern Canada Saturday morning, bringing a little over three quarters of an inch of rain at Logan Airport in Boston. However, north of Interstate 95 raindrops turned over to big, wet snowflakes by 1 p.m. This left a coating of snow on cars and in the streets. This may create some black ice for this evening, so please take precaution if you have to travel during the overnight.
Winds will be increasing tomorrow, as a cold front coming over the Great Lakes passes through. The front may help create some isolated snow showers, especially during the afternoon. However, skies will only be cloudy Sunday night. By Monday, we will see limited sunshine, and the last time we will see seasonable temperatures for a few days.
Another Arctic front from Canada will begin to sweep down into North America, as our temperatures will be dropping Monday afternoon. Skies will clear Monday night, thanks to a weak area of high pressure. Overnight lows Monday night will be in the middle teens. Despite cloudy skies on Tuesday, we will only see a high in the upper teens. This front will not be as strong as the polar vortex a few weeks ago, but will keep temperatures and wind chills in dangerous conditions for exposed skin.
The models continue to agree that a strong low developing offshore Tuesday afternoon will not have an effect on eastern Massachusetts. There is the chance of some ocean effect snow showers for the Cape and Islands into early Wednesday morning. As a stronger high pressure moves over the eastern U.S. on Wednesday, temperatures will struggle to reach the middle to upper teens. Overnight lows Tuesday through Thursday will only be in the upper single digits.
By Thursday night, a fast moving Alberta Clipper will bring the chance for some snow showers Thursday night into early Friday morning. Another small disturbance will bring some morning snow showers on Saturday, before precipitation ends before sunset. Warmer air will return over the area by this time, as highs will be near freezing, and lows in the upper teens.
72 hour forecast:
Tonight: All snow showers ends by midnight, with mostly cloudy skies and a low of 26.
Sunday: Mostly cloudy and breezy with isolated snow and/or rain showers and a high of 37. Winds will come from the west-southwest at 14-18 mph.
Sunday night: Partly cloudy with a low of 28. Winds will come from the west-southwest at 14-18 mph.
Martin Luther King Jr. Day: Partly sunny with a high of 37 with temperatures dropping in the afternoon.
Monday night: Mostly cloudy and colder with a low of 15.
Tuesday: Becoming mostly cloudy in the mid-afternoon and much colder with a high of 19.
Tuesday night: Mostly cloudy and very cold with a low of 6. Ocean effect snow showers are possible for the south coast.
Wednesday: Partly to mostly sunny. Highs 14-17, lows 6-9.
Thursday: Mostly cloudy with possible evening snow showers. Highs 20-23, lows 9-12.
Friday: Snow showers during the early morning, with mostly sunny skies by mid-morning. Highs 21-24, lows 13-16.
Saturday: Cloudy with morning snow showers ending before sunset. Highs 31-34, lows 17-20.