DAYS 1-5 (JULY 21-25)
A more “typical” mid summer pattern is now ours. While in general, the large scale pattern hasn’t shifted in a major way, it’s relaxed enough to end the more persistent humid and unsettled weather and open the door for a dry air intrusion from Canada and more rain-free days than rain-threat days. But we do have some unsettled weather to get through before that marked shot of drier air. First, we have low pressure passing to our northwest today and tonight before it exits via southeastern Canada. Its warm front will edge north and northeast, with our region still north of it for much of today. A batch of thunderstorms that occurred to our west last night entered western New England in the early morning hours, and will continue its decay / dissipation process as it moves eastward, with no more than light showers surviving into the WHW forecast area west to east this morning and midday. Other showers and storms that generate during the day to our west can reach southwestern NH, central MA, and CT by later in the day as the warm front finally pushes through and a cold front approaches from the west. This front will move into the region tonight when most of our shower and thunderstorm activity will occur. Due to lack of heating for storms based on the evening / night timing, I don’t expect the storms to be all that strong, but a few isolated downpours and lightning displays are possible, so keep that in mind if you do have evening plans. Activity will settle down overnight, leaving only a few showers possible near the coast, especially Cape Cod, by morning, before the front moves offshore into the Atlantic waters. An offshore low pressure wave may keep cloudiness moving across the region at times during the day Saturday, so despite the disappearing rain chances, it will be slow to completely clear out, sky-wise. But you will notice a reduction in humidity during the day. This will set us up for a fabulous summer day on Sunday with abundant sun, seasonable warmth, and lower humidity with dew points falling to under 60 for the first time in quite a while across most of the region. And you get to enjoy this for an extra day Monday as high pressure hangs on. Tuesday’s weather will feature a bit more humidity and a later-day thunderstorm chance as a disturbance approaches from the west again.
TODAY: Most sun early. Clouds dominate. A shower possible mid morning to noon southwestern NH, central MA, CT, possibly as far east as the I-95 belt. Isolated to scattered showers/thunderstorms later afternoon mostly I-95 belt westward. Highs 75-82. Dew point 60+. Wind SE up to 10 MPH.
TONIGHT: Mostly cloudy. Scattered showers and thunderstorms, especially before midnight. Areas of fog. Lows 66-73. Dew point 60+. Wind S up to 10 MPH.
SATURDAY: Variably cloudy. A few showers possible morning eastern areas, favoring Cape Cod. Highs 78-85. Dew point 60+. Wind SW 5-15 MPH.
SATURDAY NIGHT: Partly cloudy. Patchy fog in lower elevation locations. Lows 62-69. Dew point 60+. Wind W up to 10 MPH.
SUNDAY: Mostly sunny. Highs 81-88. Dew point near to slightly below 60. Wind NW up to 10 MPH.
SUNDAY NIGHT: Mostly clear. Lows 61-68. Dew point upper 50s. Wind NW under 10 MPH.
MONDAY: Mostly sunny. Highs 80-87, coolest coast. Dew point upper 50s. Wind variable up to 10 MPH with coastal sea breezes.
MONDAY NIGHT: Mostly clear. Lows 61-68. Dew point upper 50s to near 60. Wind variable under 10 MPH.
TUESDAY: Partly cloudy. Chance of a shower or thunderstorm by late day. Highs 82-89. Dew point 60+. Wind S-SW 5-15 MPH.
DAYS 6-10 (JULY 26-30)
A slightly more established west to northwest flow with less trough in the region allows for very warm weather and limited shower/thunderstorm chances, with July 28 being a more likely day to see unsettled weather surrounded by rain-free days. May see a few more 90+ high temp days for portions of the region but not an indication of sustained major heat.
DAYS 11-15 (JULY 31 – AUGUST 4)
Large scale pattern features high pressure in the central US and a weak trough between the Great Lakes and Canadian Maritime region. For our area this means a couple shower/thunderstorm chances but a less pronounced unsettled pattern than previously, and no sustained major heat.