DAYS 1-5 (DECEMBER 10-14)
We haven’t had many solid rain events since September, and we’ve had very few wind events this year. Later today to early Monday we get both! This event is being driven by a strong trough of low pressure swinging through the eastern US, and plentiful moisture flowing northward along a frontal boundary that will be moving fairly slowly across our region. A couple waves of low pressure will be moving up along this front, keeping its movement slow, and increasing the amount of rainfall we can see from the system. We have a slow beginning to the system, with just a cloudy sky and areas of fog for this morning before rainfall, initially in the form of quick-moving showers, moves in from west to east (elements moving south to north). Tonight it’s a much more widespread band of rain with embedded downpours and even possible thunder. Finally, a stronger low center get going and as it rapidly intensifies it will pull the front through and offshore, putting an end to the rain and strongest wind during Monday morning. Impacts from this system include potential damaging wind gusts, and some resultant power outages, with highest chance of that east of I-95, some coastal flooding at high tide time Monday morning (primary threat window 4 a.m. to 8 a.m.), and areas of flooding from heavy rainfall on roads, poor drainage areas, and small streams, with the highest chance west of I-95 where where rainfall amounts of 2 to 4 inches will be common (lesser rain expected to the east of there). By midday Monday, the rain is exiting (or already gone), and we’ll see some clearing, drying, and a temperature fall. The good news is most surfaces will dry adequately before temperatures drop below freezing Monday night. However, any remaining standing water will freeze, so keep this in mind if it’s a factor in your walking or driving travel Monday night / early Tuesday. Any snow from this system? That will be mainly in the mountains to our west and northwest, but a few snow showers can make their way into the higher elevations of central MA and southwestern NH as the colder air arrives during Monday afternoon and evening. After this event, the weather pattern is quiet through midweek with seasonably chilly and dry weather. A weak cold front will swing through the region Wednesday with little fanfare.
TODAY: Cloudy. Rain showers possible in the afternoon, especially I-95 belt westward. Highs 56-63. Wind S 5-15 MPH morning, 15-25 MPH afternoon, higher gusts.
TONIGHT: Cloudy with rain and embedded thunderstorms. Lows 50-57. Wind S 15-30 MPH, higher gusts – above 40 MPH inland, above 50 MPH coastal areas.
MONDAY: Cloudy into mid morning with rain exiting from west to east. Sun/cloud mix late morning on with a passing afternoon snow shower possible favoring higher elevations central MA and southwestern NH. Highs 52-59 early, then cooling into and through 40s. Wind W 15-25 MPH, higher gusts.
MONDAY NIGHT: Partly cloudy. Lows 22-29. Wind chill below 20. Wind W 10-20 MPH, higher gusts, diminishing overnight.
TUESDAY: Mostly sunny to partly cloudy. Highs 38-45. Wind W 5-15 MPH.
TUESDAY NIGHT: Partly cloudy. Lows 25-32. Wind W 5-15 MPH.
WEDNESDAY: Partly sunny. Highs 38-45. Wind W 5-15 MPH, higher gusts.
WEDNESDAY NIGHT: Partly cloudy then clearing. Lows 22-29. Wind WNW 5-15 MPH, higher gusts.
THURSDAY: Sunny to partly cloudy. Highs 35-42. Wind W 5-15 MPH.
DAYS 6-10 (DECEMBER 15-19)
Latest indications are that any additional storminess mid to late period stays mostly to the south, but may be a close call. Overall pattern is dry with no temperature extremes.
DAYS 11-15 (DECEMBER 20-24)
Other than 1 or 2 fairly minor systems the overall pattern looks fairly quiet with no major temperature extremes.