7:25AM
DAYS 1-5 (JUNE 26-30)
The final 5 days of June will have a bit more summer feel to them overall, but don’t look for a heatwave as we are not in the pattern for it. Do expect higher humidity the next few days in general, probably today being the most humid but Friday ending up as the warmest day. The only weather system of note will be a weak trough that approaches from the west today and passes by early Thursday. This triggers thunderstorms to the west of the region that run out of gas due to lack of support as they head east this evening, and while the dying version may reach the western portions of the WHW forecast area, the eastern areas will never see them. There is a slight risk of a pop up shower over the interior areas on Thursday, and high pressure should exert enough control to eliminate that risk during Friday. For the weekend, this is when things are less clear. What we do know is that one disturbance will pass by sometime Saturday, and a small but potent upper low will drop out of eastern Canada Sunday. Both of these will bring threats for some kind of unsettled weather, and my current leaning is for faster timing of system #1 as a wave of low pressure coming from the Great Lakes, bringing some wet weather late Friday night and early Saturday, then with a lingering trough the potential for some pop up showers and thunderstorms during the day Saturday. Sunday’s event, I’m also leaning toward faster timing, will consist of a lobe of cold air aloft and a surface cold front, both of which will likely help ignite at least scattered showers and thunderstorms, but all of which may be done on the earlier side rather than later. For what it’s worth, 2 of the major medium range models flip flopped on this in the latest runs, with one moving away from this thinking while the other moved toward it. Gotta love models. Will update my thoughts as needed on the weekend situation. For now, at days 4 & 5, the forecast wording will be generalized.
Forecast details…
TODAY: Low overcast and areas of fog to start, burning off to sunshine. Some clouds advance from the west late-day with a shower or thunderstorm possible by evening southwestern NH and central MA. Humid. Highs 77-84. Wind light variable, coastal sea breezes.
TONIGHT: Partly cloudy evening. Mostly cloudy with patchy fog overnight. Humid. Lows 60-67. Wind light S.
THURSDAY: Mostly cloudy early, then partly sunny. Slight risk of an isolated shower interior southern NH and MA. Slightly less humid. Highs 79-86. Wind light W.
THURSDAY NIGHT: Partly cloudy. Lows 62-69. Wind light W.
FRIDAY: Partly cloudy. Highs 83-90. Wind W up to 10 MPH.
FRIDAY NIGHT: Clouding over. Rain or showers overnight. More humid. Lows 60-67. Wind light variable.
SATURDAY: Cloudy with areas of fog and a chance of rain early, then partly sunny with scattered showers and thunderstorms. Humid. Highs 79-86. Wind variable 5-15 MPH.
SATURDAY NIGHT: Partly cloudy. Patchy fog. Humid. Lows 60-67. Wind W 5-15 MPH.
SUNDAY: Variably cloudy. Chance of showers/thunderstorms, favoring morning-midday. Humid, but drying late. Highs 76-83. Wind W 10-20 MPH shifting to N.
DAYS 6-10 (JULY 1-5)
The majority of this period will see dry weather, with weak disturbances around July 3 and 5 bringing a possibility of a shower or thunderstorm. Temperatures start out slightly below normal then warm to generally seasonable levels. No major heat expected.
DAYS 11-15 (JULY 6-10)
A general westerly flow, seasonably warm pattern with a couple opportunities for showers/thunderstorms, but dry weather most of the time.