DAYS 1-5 (OCTOBER 15-19)
High pressure builds in today with fair, seasonable weather. Being on the easterly side of the high at first we’ll have an active breeze to start, along with some patchy clouds, but a trend to less wind and more sun with time. The high pressure area departs tonight and opens the door to our next round of unsettled weather. Low pressure will move quickly east northeastward out of the Midwest and Great Lakes across northern New England Friday and Friday night. Its warm front will bring us a period or two of rain Friday morning, and its cold front a round of showers in the evening, with maybe a few stray showers between. The low will then rapidly intensify as it moves into Atlantic Canada, which drags the coolest air mass of the season so far into our region on a gusty wind Saturday. The frontal boundary will become nearly parallel to the upper flow though as it moves off the South Coast Friday night into Saturday, and this will allow some cloudiness to linger into Saturday morning, including a rain shower threat in far southeastern areas. But this will be relatively short-lived and the balance of that day will feature sun and passing clouds across the region with well below normal temperatures, made to feel even colder by the gusty wind. High pressure builds into the region Saturday night and Sunday with slackening wind and dry but cool weather. The high will then sink to the south by Monday with a slightly milder westerly air flow and continued fair weather.
TODAY: Mostly sunny. Highs 57-64. Wind NW 5-15 MPH.
TONIGHT: Increasing clouds. Rain arrives west of I-95 pre-dawn. Lows 42-49. Wind variable to SE up to 10 MPH.
FRIDAY: Cloudy with rain and areas of fog morning. Clouds may break for sun at times afternoon with the chance of a quick-passing shower. Highs 62-69. Wind SE up to 10 MPH early becoming SW 10-20 MPH afternoon.
FRIDAY NIGHT: Mostly cloudy. Numerous showers west to east evening. A passing shower possible overnight. Lows 41-48. Wind SW 5-15 MPH shifting to NW 10-20 MPH with higher gusts.
SATURDAY: Mostly cloudy through mid morning including a chance of additional showers South Coast to MA South Shore, then a sun / cloud mix. Highs 47-54. Wind NW 15-25 MPH, gusts 30 MPH or greater.
SATURDAY NIGHT: Partly cloudy, then clearing. Lows 27-34 interior southern NH and central MA, 35-42 elsewhere, warmest urban centers and immediate coastal areas. Wind NW diminishing to 5-15 MPH.
SUNDAY: Abundant sunshine. Highs 55-62. Wind NW 5-15 MPH, diminishing late in the day.
SUNDAY NIGHT: Clear. Lows 35-42. Wind W up to 10 MPH.
MONDAY: Sunny. Highs 57-64. Wind W up to 10 MPH.
DAYS 6-10 (OCTOBER 20-24)
Some uncertainty has been introduced to the medium range period as guidance diverges greatly. Overall pattern suggest some blocking returning with high pressure from the US Northeast into southeastern Canada and low pressure off the Atlantic Coast well to the south. While some guidance keeps low pressure well out to sea later in the period, other guidance suggests it drifts in our direction later in the period. Will keep an eye on trends. Leaning mainly dry for now with maybe a late-period passing rain shower threat from a northern stream system
DAYS 11-15 (OCTOBER 25-29)
The blocking pattern may play a role early in the period, for now leaving it with an uncertain outlook. Trends are back to a zonal (west to east) flow toward month’s end.