DAYS 1-5 (AUGUST 8-12)
Our hot weather stretch is nearing its end with 2 more days to go of 90+ (for most). While the Bermuda High continues to provide the heat and humidity, there may be a sneak-preview of the coming cooler air when a back-door front sneaks down the coast of Maine and NH to about Cape Ann MA tonight into Tuesday before being pushed back to the north. So for several hours, the temperatures in those areas can be quite different than much of the rest of the region. This frontal boundary may enhance the development of the air mass showers and storms that will be forming here and there later today, if any should be in that region, so keep an eye out for that. On Tuesday, our final push of heat comes just ahead of an approaching cold front, which will initiate a more widespread batch of showers and thunderstorms for the region in the afternoon and evening hours. We’ll have to watch for any of these to be strong to locally severe. As this boundary passes, it’s going to open the door to cooler air for midweek, but as is typical for an early to mid August cold front, the humidity is not going to just vanish. That will remain rather high for a couple days, and with the front coming to a halt just to the south before starting to dissipate, a little low pressure wave coming along it may result in some beneficial shower activity, at least for the South Coast region, mainly Wednesday afternoon and night based on current timing. I think this should pull out of the region by early Thursday, and we’ll have a nice, mild to warm but moderately humid summer day on that day. Another frontal boundary will deliver drier air to the region by Friday, which also looks like a fair weather day at this time, but much cooler than the week will start out.
TODAY: Sun/cloud mix. Isolated pop-up showers and thunderstorms this afternoon and early evening, any of which can be on the stronger side. Highs 90-97, except 83-90 South Coast. Dew point upper 60s to middle 70s. Wind SW 5-15 MPH, a few higher gusts.
TONIGHT: Partly cloudy. Patchy fog. Lows 68-75 except 61-68 NH Seacoast in northeastern MA. Dew point upper 60s to lower 70s except lower to middle 60s northeastern MA to NH Seacoast. Wind SW 5-15 MPH, strongest South Coast, except NE up to 10 MPH northeastern MA and NH Seacoast.
TUESDAY: Partly sunny. Afternoon and evening showers and thunderstorms likely, some of which may be strong to locally severe. Highs 90-97 except 83-90 South Coast. Dew point around 70. Wind SW 10-20 MPH except variable under 10 MPH early NH Seacoast and northeastern MA.
TUESDAY NIGHT: Mostly cloudy. Chance of showers and thunderstorms. Areas of fog. Lows 65-72. Dew point upper to middle 60s. Wind variable up to 10 MPH.
WEDNESDAY: Mostly cloudy. Showers likely. Chance of thunderstorms. Highs 75-82, coolest in eastern coastal areas. Dew point upper 60s. Wind NE up to 10 MPH.
WEDNESDAY NIGHT: Mostly cloudy. Chance of showers. Areas of fog. Lows 62-69. Dew point 60s. Wind variable up to 10 MPH.
THURSDAY: Partly sunny. Chance of showers early, mainly South Coast. Highs 77-84, coolest coast. Dew point 60s. Wind variable to N up to 10 MPH with coastal sea breezes.
THURSDAY NIGHT: Partly cloudy. Lows 60-67. Dew point falling to 50s. Wind N 5-15 MPH.
FRIDAY: Partly cloudy. Highs 73-80, coolest coast. Dew point upper 50s. Wind NE 5-15 MPH.
DAYS 6-10 (AUGUST 13-17)
August 13-14 weekend looks fair with temperatures slightly below to near normal with high pressure holding unsettled weather to the south of New England. A little uncertain following this as we’ll be near an area of unsettled weather but high pressure may be able to keep the region dry into early next week as well.
DAYS 11-15 (AUGUST 18-22)
Weak zonal flow pattern. Some alternating between summer warmth and humidity and a little drier/cooler air from Canada possible, but rainfall is expected to average below normal. We’re also getting to the time of year where we have to watch for possible tropical moisture from the south, and some medium range guidance has hinted at “activity” but that’s nothing unusual to see so far in advance. Just a reminder that tropical season is a wild card in the medium range uncertainty for the next several weeks…