DAYS 1-5 (JULY 17-21)
Another hot and humid day today as high pressure remains anchored offshore, but that anchor is going to be pulled up for readjustment shortly. We’ve a cold front approaching, and it brings another good chance of showers and thunderstorms to the region later today and part of tonight. Some of the parameters today will be a little less favorable for severe storms than what we had last evening, but I can’t rule out a couple in the cluster or segments of storms that will form and move into the area. Overall, the trend will be for strongest storms to occur in the western reaches of our region, with a general weakening trend and lessening coverage trend as we see them head eastward, with a general window of 4PM to 10PM from west to east, though this may have to be adjusted a little on its front-end and back-end, pending the initial location of storm development. Overnight, the cold front moves through fairly quietly. Previously, I speculated we may see additional showers part of Thursday morning, but this may not be the case, with just some lingering morning cloudiness to deal with and a slower drop in the humidity – not a quick enter of crisp, dry air. So even without any showers, Thursday is still a transition day in terms of lowering dew points, which will be a process that takes place from northwest to southeast under a mix of sun and clouds. Canadian high pressure comes for a visit with fair, seasonable, low humidity weather Friday and Saturday, before it slides offshore Sunday and we see a slight up-tick in both temperature and humidity, but still quite nice! A weak cold front approaches later Sunday, but outside of a slight chance of a late-day or evening shower making it into northern areas, I don’t expect there will be much evidence of its presence, so we do have a really nice weekend coming up…
TODAY: Sun/cloud mix. Potential thunderstorms central MA / southwestern NH by evening. Highs 88-95, coolest South Coast. Dew point 70+ but can fall below 70 in some down-slope areas on lee sides of hills. Wind SW increasing to 10-20 MPH.
TONIGHT: Variably cloudy. Showers and thunderstorms progress eastward in clusters / segments but also diminish with time, then end most places except potentially lingering into overnight to the south of Boston. Areas of fog forming late evening / overnight especially South Coast region. Lows 70-77. Dew point upper 60s to lower 70s. Wind SW to variable 5-15 MPH, but can be strong and gusty for brief times around any thunderstorms.
THURSDAY: Variably cloudy with most clouds including areas of fog South Coast in the morning, then a sun/cloud mix. Highs 80-87. Dew point lowering into and through the 60s from northwest to southeast. Wind variable to NW 5-15 MPH.
THURSDAY NIGHT: Clearing. Patchy interior lower elevation ground fog. Lows 58-65, warmest urban areas. Dew point upper 50 to lower 60s. Wind NW under 10 MPH.
FRIDAY: Sunny – few fair weather clouds. Highs 78-85, coolest at the coast. Dew point upper 50s. Wind variable up to 10 MPH with coastal sea breezes.
FRIDAY NIGHT: Clear. Patchy interior lower elevation ground fog develops. Lows 57-64. Dew point middle to upper 50s. Wind variable under 10 MPH.
SATURDAY: Mostly sunny. Highs 81-88, a bit cooler though in some coastal areas. Dew point upper 50s. Wind variable up to 10 MPH with coastal sea breezes.
SATURDAY NIGHT: Mostly clear. Lows 60-67. Dew point upper 50s. Wind SW up to 10 MPH.
SUNDAY: Sunny to partly cloudy. Maybe an evening shower reaches southern NH. Highs 82-89. Dew point lower 60s. Wind SW 5-15 MPH.
DAYS 6-10 (JULY 22-26)
Higher humidity returns next week but probably without a hot spell. Shower/thunderstorm chances are highest in the July 23-25 period.
DAYS 11-15 (JULY 27-31)
A push of drier air early period then humidity returns again with a few showers / storms possible. No prolonged major heat indicated at this time.