7:26AM
DAYS 1-5…
The old frontal boundary is just about gone, but today’s kicker for potential thunderstorms will be a disturbance or trough moving through from north to south during the afternoon and a couple of convergence zones between weak sea breezes and weak land breezes. The most likely chance to see activity today will be within 30 miles of the coast of NH and the eastern coast of MA. A few initial storms may fire up along a boundary in southeastern MA as early as noon or 1PM, but it’s unclear if storms will be able to form here because of a layer of warm/dry air at mid levels of the atmosphere. Eventually that layer should move away. Whether those initial storms form or not, another area of showers/thunderstorms should get going in southeastern NH and/or northeastern MA and redevelop their way south and southeast along the coastal plain of MA during the course of the afternoon. Because of the variability of convection, some storms may be strong to even marginally severe in some areas and barely impact others, so it will be important to follow the trends during the day. By tonight, all activity diminishes. Wednesday, a stronger layer of warm air above will probably impede any storm development, but by Thursday, an approaching cold front will bring a much better chance of showers/thunderstorms, possibly in squall line form, by later in the day or sometime at night, depending on timing. Some areas will see a heatwave today through Thursday, but Boston likely will not, as I don’t think they will make 90 due to the earlier onset of a sea breeze there. Friday/Saturday will both be very warm to hot days but with lower humidity than the next 3 days have.
TODAY: Partly sunny and hazy. Scattered showers and thunderstorms mainly in southeastern NH and eastern MA midday and afternoon. Humid. Highs 78-85 coast, 85-92 interior. Wind light SW to W except coastal sea breezes developing.
TONIGHT: Partly cloudy and hazy. Muggy. Lows 66-73. Wind light SW.
WEDNESDAY: Hazy sunshine. Humid. Highs 88-95. Wind SW 5-15 MPH.
THURSDAY: Partly cloudy and hazy. Chance of late day and nighttime t-storms. Humid. Lows 68-75. Highs 88-95.
FRIDAY: Mostly sunny. Less humid. Lows 65-72. Highs 85-92.
SATURDAY: Mostly sunny. Lows 63-70. Highs 86-93.
DAYS 6-10 (AUGUST 2-6)…
Hot and humid with isolated thunderstorms August 2. Warm and humid with a daily risk of showers and thunderstorms August 3-5. Dry, warm, less humid by August 6.
DAYS 11-15 (AUGUST 7-11)…
Ridges of high pressure in the central US and off the East Coast with a very weak trough between. This pattern is typically warm and humid here with a few episodes of showers and thunderstorms.