Although Thursday’s weather map looks very similar to 24 hours ago – a slow moving front interacting with energetic disturbances aloft – there has been an important, subtle shift: the front separating cooler and warmer air and serving to focus storms has sagged south just a bit.
A southward move of the front puts yesterday’s hard-hit Boston Metro into the cooler, less humid air, meaning fuel is very limited for substantial storm development.
Instead, the Boston area will find showers and then a period of late day rain, but the threat for flash flooding today shifts south to the Hartford-Providence corridor, with Cape Cod seeing heavy rain and thunder arriving late afternoon through evening and some poor drainage flooding possible.
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Summer air will try to return Saturday but will clash with the recent cooling, and this should mean stubborn Saturday clouds with a few showers possible, particularly in Northern and Western New England, but it's not expected to be a day-jeopardizing event.
Sunday should be a great day, as summer air returns, leading to a classic summer pattern next week that will include high temperatures in the 80s with some afternoon storms in the exclusive Early Warning Weather 10-day forecast.