DAYS 1-5 (JULY 22-26)
This 5-day period will be unsettled with several shower and thunderstorm opportunities. First a weak warm front or “dew point boundary” lifts across the region today and will be a focal point for a few showers and storms that pop up this afternoon, mainly near to a little north of I-90 in MA. Many areas will see nothing, but those that do can experience a heavy downpour. This dissipates this evening but another frontal boundary sitting near the South Coast will be the track for a low pressure area moving along it overnight and early Tuesday, bringing fairly widespread showers to the region. This exits fairly early in the day Tuesday, and if an additional shower or thunderstorm pops up as the sun tries to break out at times, it will probably take place in the hills to the west, maybe even west of the WHW forecast area altogether. The next wave of low pressure comes along during the morning and midday hours of Wednesday when showers are most likely again, but a drying trend should return during Wednesday afternoon. Thursday’s shower and thunderstorm threat comes from a cold front that will be pushed into and across New England as a disturbance tracks from the Great Lakes across northern New England and adjacent southern Canada. This is the day that has the greatest threat of stronger thunderstorms, but we’ll have to see how it ends up in terms of details based on a few more specifics to be brought into focus the next few days. This front moves offshore Friday, but some upper level energy moving through can still kick off a shower or thunderstorm sometime that day too.
TODAY: High clouds increase, filtering the sun more and more with time. Additionally, isolated pop-up showers and thunderstorms possible this afternoon and early evening mainly near to just north of I-90 in MA. Highs 78-85, coolest along the coast. Dew point ranging from lower 60s north of I-90 to upper 60s South Coast. Wind variable to SE up to 10 MPH, but a few higher gusts.
TONIGHT: Any isolated showers/storms in MA dissipate early, but clouds thicken and more widespread showers arrive from southwest to northeast late evening and overnight. Areas of fog. Lows 63-70. Dew point in the 60s. Wind SE to S up to 10 MPH evening shifting to SE to E overnight.
TUESDAY: Cloudy with showers likely early to mid morning, along with areas of fog, then clouds break for sun at times with only a slight chance of an afternoon shower or thunderstorm in the hills of southwestern NH to central MA. Highs 76-84, coolest coastal areas. Dew point 65+. Wind E to SE up to 10 MPH.
TUESDAY NIGHT: Mostly cloudy. Areas of fog. Lows 65-72. Dew point middle 60s to around 70. Wind variable under 10 MPH.
WEDNESDAY: Mainly cloudy with a good chance of showers morning to midday, along with areas of fog. Clouds break for sun at times later in the day. Highs 75-82, coolest coast. Dew point middle 60s to 70. Wind variable up to 10 MPH, mostly SE to E.
WEDNESDAY NIGHT: Partly cloudy. Patchy fog. Lows 65-72. Dew point 60s. Wind variable up to 10 MPH.
THURSDAY: Variably cloudy. Chance of showers and thunderstorms, especially in the afternoon. Highs 78-85, coolest coast. Dew point upper 60s to lower 70s. Wind variable up to 10 MPH becoming SW 5-15 MPH.
THURSDAY NIGHT: Variably cloudy with a chance of showers and thunderstorms in the evening. Partly cloudy overnight. Patchy fog. Lows 65-72. Dew point middle to upper 60s. Wind SW 5-15 MPH shifting to NW.
FRIDAY: Partly sunny. A passing shower or thunderstorm possible. Highs 79-86. Dew point falling to lower 60s. Wind NW 5-15 MPH.
DAYS 6-10 (JULY 27-31)
Dry, warm to hot, and moderately humid weather expected for the July 27-28 weekend as high pressure builds in. Warm to hot, humid weather with a couple episodes of showers and thunderstorms in the July 29-31 period with high pressure offshore and a frontal boundary approaching from the northwest along with a southwesterly air flow over the region.
DAYS 11-15 (AUGUST 1-5)
The pattern that ends July will also begin August with a general southwesterly flow, moderate to high humidity, and occasional but limited shower and thunderstorm chances.