DAYS 1-5 (OCTOBER 18-22)
The combination of low level moisture, cool air aloft, and one more disturbance sliding through from the southwest at mid levels will create a fair amount of cloud cover for the region today, but the rain shower threat should be confined to areas south of I-90, favoring the South Coast, and any showers that do occur will be on the lighter side and fairly quick-passing. High pressure builds in making Thursday the mild, dry easy pick of the week. And then things go downhill again quickly on Friday into the start of the weekend. What we will experience will be caused by the beginning of a convergence of 3 systems. The first is low pressure moving up the Atlantic Seaboard with a good slug of moisture. The second is a frontal system moving in from the west. The third is a rapidly-moving low pressure area diving southeast from the Upper Midwest. The upper level features with these initially are a trio of troughs which will eventually consolidate into one, along with one rapidly-strengthening surface low. But this triple merger will not complete itself until the system is already moving away. The weather we see will be the result of this being in progress. First, a few rounds of showers Friday afternoon and night with the first low moving up the coast, which will be weak, but contain a fair amount of moisture. The bulk of the rainfall should occur from late Friday evening to the early hours of Saturday. The frontal boundary will then cause a few additional rounds of showers during the day Saturday, but also allow several rain-free hours. It’s not really until the 3rd puzzle piece rounds the base of the trough and catches up to the system will it become a rapidly strengthening low in the Gulf of Maine, moving quick toward the maritime provinces of Canada. One more lobe of moisture can create another batch of showers Saturday night, and then as this system pulls away Sunday, expect a dry but windy, cool day with a sun/cloud mix.
TODAY: Mostly cloudy to partly sunny. A few passing showers south of I-90. Highs 60-67. Wind SW up to 10 MPH.
TONIGHT: Clearing. Patchy ground fog. Lows 45-52. Wind SW under 10 MPH.
THURSDAY: Mostly sunny. Highs 62-69. Wind SW 5-15 MPH.
THURSDAY NIGHT: Partly cloudy. Patchy fog. Lows 52-59. Wind S up to 10 MPH.
FRIDAY: Mostly cloudy. Isolated to scattered rain showers probable. Highs 61-68. Wind S 5-15 MPH.
FRIDAY NIGHT: Mostly cloudy. Scattered to numerous rain showers likely. Areas of fog. Lows 54-61. Wind SE 5-15 MPH becoming variable under 10 MPH.
SATURDAY: Mostly cloudy. Episodes of rain showers. Highs 58-65. Wind SW up to 10 MPH, shifting to W and increasing to 5-15 MPH late-day.
SATURDAY NIGHT: Mostly cloudy. Additional rain showers possible. Lows 45-52. Wind W 10-20 MPH.
SUNDAY: Sun/cloud mix. Highs 53-60. Wind NW 10-20 MPH, gusts 25-35 MPH.
DAYS 6-10 (OCTOBER 23-27)
Dry weather, below normal temps early next week, breezy at first then less wind. Fair, milder mid to late week but a frontal boundary may approach the region with a rain shower chance by the end of the period.
DAYS 11-15 (OCTOBER 28 – NOVEMBER 1)
Dry weather, below normal temps early in the period, then fair and milder as high pressure dominates, then another trough may bring unsettled weather by the end of the period.