DAYS 1-5 (JUNE 30 – JULY 4)
On this final day of June we will also experience the final day of high heat and humidity in this early summer stretch of it. Unlike the last 2 days, today carries a risk of more regional thunderstorm activity as a cold front approaches. The timing looks a little later on this today, with the primary threat for the WHW forecast area coming in the 4PM through 9PM time frame from northwest to southeast. There can be a couple isolated shower or storms popping up ahead of that threat window, as early as 2PM or so. The greatest threat for severe weather is damaging wind with the storms. Small hail is a potential, along with the usuals: heavy downpours, lightning. If a storm cluster forms and trains over the same area for a while, which is possible, then flash flooding would become a threat, so we’ll have to watch for this as well. If you plan to be outside today into this evening, obviously plan for both the high heat and humidity and watch for approaching or developing storms – and have a plan! Once we get by this threat tonight, the cold front that delivers it will also deliver slightly cooler and less humid air, but only down a little bit, and as the front washes out over far southern New England Thursday we’ll still feel a bit of humidity and it will be a warm day, but we’ll be dealing with a lot more high and mid level cloudiness than we’ve seen during the last few days. An influx of moisture will head northeastward toward our region Thursday night while a second frontal boundary pushes through from the north. This front may trigger a few more showers and thunderstorms in the region Thursday afternoon, and the combination of it and the moisture arriving from the southwest is expected to bring more widespread showers to the region later Thursday night into a portion of Friday, before we see a drying trend north to south, along with much cooler air this time. High pressure from Canada will push the unsettled weather further south as we reach the holiday weekend, but upper level low pressure will still be stretched out across the region and will take a good deal of time to depart, so at this point I cannot rule out some scattered shower activity Saturday and isolated showers for Sunday. As far as the actual weekend goes, humidity levels will be quite manageable, and Saturday will be the cooler of the two days with a general northeasterly flow. The wind should be variable then eventually more westerly on Sunday allowing for a bit of a warm up to get underway.
TODAY: Early clouds north central MA and southern NH otherwise mostly sunny through midday. Partly to variably cloudy this afternoon and evening with isolated showers and thunderstorms possible by mid afternoon, then scattered to numerous showers and thunderstorms from northwest to southeast later afternoon and evening. Thunderstorms can become severe. Highs 88-95, cooler South Coast.. Dew point upper 60s to lower 70s. Wind SW 5-15 MPH, higher gusts.
TONIGHT: Variably cloudy evening with showers and thunderstorms favoring eastern and southern areas. Partly cloudy with patchy ground fog forming overnight. Lows 67-74. Dew point upper to middle 60s. Wind variable up to 10 MPH.
THURSDAY: Variably cloudy but some sunshine. Highs 75-80 South Coast, 80-85 elsewhere. Dew point middle 60s. Wind variable 5-15 MPH.
THURSDAY NIGHT: Cloudy. Numerous showers. Chance of thunderstorms. Areas of fog. Lows 60-67. Dew point falling to near 60. Wind variable 5-15 MPH becoming N to NE.
FRIDAY: Mostly cloudy. Chance of showers, especially CT, RI, southern MA. Highs 68-75. Dew point near 60. Wind NE 5-15 MPH
FRIDAY NIGHT: Mostly cloudy. Lows 55-62.Wind NE 5-15 MPH.
SATURDAY: Partly sunny. Scattered showers possible, favoring central MA, eastern CT, and RI. Highs 65-70 coast, 70-75 inland. Wind NE 5-15 MPH.
SATURDAY NIGHT: Partly cloudy. Lows 56-63. Wind NE up to 10 MPH becoming variable.
SUNDAY: Partly sunny. Isolated afternoon showers possible, mainly southwestern NH and central MA. Highs 75-82. Wind variable to W 5-15 MPH.
DAYS 6-10 (JULY 5-9)
Warmer slightly more humid with a chance of a few showers and thunderstorms later July 5 and again July 6 with a couple disturbances passing by. Mostly fair and seasonable weather mid to late period with weak high pressure in control, but this remains a low confidence forecast.
DAYS 11-15 (JULY 10-14)
Near to above normal temperatures and an increase in humidity but with a slightly better chance of showers and thunderstorms as a frontal boundary hangs out in the region.