DAYS 1-5 (AUGUST 30 – SEPTEMBER 3)
A warm front is passing through the region this morning and introducing a shot of very warm and muggy air, but a cold front approaching on the quick from the northwest will also trigger the chance of showers and thunderstorms today, especially mid afternoon into evening. I’m not expecting widespread but rather scattered coverage of these showers and storms in one or possibly two waves. Any of the storms can become strong to severe, but this will be a rather isolated occurrence. Activity settles down later this evening and overnight as the front pushes through and introduces a slightly drier air mass for Tuesday, although it will still be on the warm side with a sun/cloud mix for the final day of August. Cooler air will filter in at night as the wind shifts more to the north and eventually to the east. September arrives Wednesday and we’ll be watching the remains of Hurricane Ida, heading in our direction from the southwest. As this event draws closer, it looks like the low pressure area that was once the hurricane, in the form of a post-tropical , weaker but defined low pressure center, will be passing to the south of New England, far enough to keep us from re-entering the tropical air mass on the other side of the front the low will have linked up with, but close enough to spread its rain shield into southeastern New England, with current timing Wednesday night and Thursday. Some guidance moves this out rather quickly Thursday while other guidance allows it to hang around longer into Thursday night too. So the end-timing is still a bit in question. I have slowed it down slightly in comparison to yesterday’s outlook. Regardless, drier air moves in by Friday but there may be just enough instability left in the atmosphere to pop a couple diurnal showers.
TODAY: Mostly cloudy to partly sunny. Isolated showers and thunderstorms possible mainly southern NH and central MA early afternoon. Scattered showers and thunderstorms possible all areas mid afternoon on. Highs 81-88. Dew point upper 60s to lower 70s. Wind SW 5-15 MPH, can be strong and gusty near any storms.
TONIGHT: Variably cloudy. Chance of showers and thunderstorms into late evening favoring eastern MA, RI, and eastern CT. Areas of fog. Lows 65-72. Dew point middle to lower 60s. Wind W up to 10 MPH.
TUESDAY: Partly cloudy. Highs 80-87. Dew point falling to near 60. Wind WNW 5-15 MPH.
TUESDAY NIGHT: Mostly clear. Lows 60-67. Dew point upper 50s. Wind N up to 10 MPH.
WEDNESDAY: Increasing clouds. Highs 70-77. Dew point near 60. Wind E up to 10 MPH.
WEDNESDAY NIGHT: Cloudy. Rain likely. Areas of fog. Lows 60-67. Dew point lower to middle 60s. Wind SE to E 5-15 MPH.
THURSDAY: Cloudy with rain likely, tapering off late day when clouds may break especially northwest of Boston. Areas of fog through midday. Highs 65-72. Dew point lower to middle 60s. Wind E 5-15 MPH shifting to N.
THURSDAY NIGHT: Partial clearing. Areas of fog. Any lingering rain ends. Lows 58-65. Dew point lower 60s to upper 50s. Wind N to NW up to 10 MPH.
FRIDAY: Partly cloudy. Slight chance of isolated showers. Highs 71-78. Dew point near 60. Wind NW up to 10 MPH.
DAYS 6-10 (SEPTEMBER 4-8)
Labor Day Weekend… High pressure in control to start with dry and pleasant Saturday September 4 with low humidity, then similar Sunday September 5 with a slight increase in humidity. Monday September 6 humid with passing showers and thunderstorms possible as a cold front approaches and passes through the region. Drier, cooler weather expected to arrive for the end of the period.
DAYS 11-15 (SEPTEMBER 9-13)
Warmest early and late period, cooler interlude mid period with an air mass from Canada. Showers will be limited, probably the best chance with air mass change late September 9 or September 10.