DAYS 1-5 (JANUARY 13-17)
A wave of low pressure on a frontal boundary to the south will toss some cloudiness into the region today over the top of ocean-effect cloudiness coming in on an northeasterly surface flow due to high pressure in eastern Canada. There will be enough low level moisture to produce some rain or snow showers over Cape Cod and a few snow showers for the North Shore, especially Cape Ann, during the day today, with a few flakes back toward I-95 over eastern MA as well. Moisture associated with the wave to the south will stay away. Another disturbance heading eastward from the Tennessee Valley will pass south of New England Tuesday night while a system in the northern jet stream tracks from the Great Lakes to the St. Lawrence Valley. A trough of low pressure connecting these systems will bring some light precipitation, mainly rain but possibly a bit of sleet, to the region late Tuesday. A small bubble of high pressure brings dry weather for the day Wednesday, but the pattern of quick-moving systems means the next low pressure area will be approaching later Wednesday and will cross the region Wednesday night and the first half of Thursday with some precipitation, favoring mix southern NH and northern MA and rain southern MA southward, although this looks like a minor system, precipitation-wise. After it gets by it will intensify and drag down colder air from Canada later Thursday into Friday as high pressure builds across southeastern Canada. Enough cold air will be in place so that when the next in a series of low pressure areas comes along Saturday, everybody will likely start at snow. It remains to be seen if the precipitation will stay snow everywhere. The early indications on the low track is that it will be further south than some of our previous systems, but close enough so that a rain/snow line may be involved. It’s too early for amounts and details of rain versus snow or timing of precipitation, but that will be fine-tuned as it gets closer. The updated detailed forecast follows…
TODAY: Mostly cloudy. Snow showers possible near eastern coastal areas favoring Cape Cod (may mix with rain there) and Cape Ann MA. Highs 35-42. Wind N to E up to 10 MPH.
TONIGHT: Mostly cloudy. Lows 26-33. Wind variable under 10 MPH.
TUESDAY: Mostly cloudy. Highs 38-45. Wind variable under 10 MPH.
TUESDAY NIGHT: Mostly cloudy. Chance of rain showers except sleet/snow showers possible southern NH and around the MA/NH border. Lows 32-39. Wind variable up to 10 MPH.
WEDNESDAY: Partly sunny. Highs 44-51. Wind variable 5-15 MPH.
WEDNESDAY NIGHT: Cloudy. Chance of rain late but possible mix southern NH. Lows 33-40. Wind variable 5-15 MPH.
THURSDAY: Cloudy start with rain showers except mix/snow showers northern MA / southern NH. Clouds/sun midday-afternoon. Highs 38-45. Wind variable becoming W to NW increasing to 15-25 MPH, higher gusts.
THURSDAY NIGHT: Clearing. Lows 11-18. Wind NW 10-20 MPH and gusty. Wind chill near to below 0.
FRIDAY: Mostly sunny. Highs 22-29. Wind NW 10-20 MPH and gusty. Wind chill below 10 at times.
DAYS 6-10 (JANUARY 18-22)
Winter storm threat January 18-19 in which the track of the storm will determine a rain/snow line. Early idea is that everybody starts as snow Saturday, greatest impact Saturday night but a mix/change line favors the areas south of I-90, and storm makes an exit during Sunday with windy and cold weather following for the remainder of the MLK Jr Weekend through Monday January 20. Fair, cold weather January 21 and we may be watching another storm threat by January 22.
DAYS 11-15 (JANUARY 23-27)
Snow/mix/rain threat at start and end of period. Fair weather between. Temperatures near to below normal.