Metro Boston, North Shore and Metro West: Over the past couple of days the humidity has been a main topic of conversation with dew points generally in the low 70s making it very uncomfortable to be outdoors. Most of the shower activity has remained to our west early this week, including pockets of severe weather with the coastal plain seeing very little action through Wednesday evening.
Today that all changes as the focus for the showers and thunderstorms shifts eastward making eastern Massachusetts the target for potential heavy rain and thunderstorms. The last of the tropical air mass is with us through a good portion of Wednesday but a cold front, located in western Massachusetts early this morning, finally pushes through here and offshore tonight. Behind this front it turns much more comfortable as dew points fall back into the 50s.
First we have to endure another day of humidity with the likelihood of showers and thunderstorms. A disturbance located along the front near Long Island will ride over southeast and eastern Massachusetts during Wednesday enhancing the potential for locally heavy downpours. With that in mind the National Weather Service has a Flash Flood Watch in place until 2 PM this afternoon as most of the heavy action should diminish during the afternoon. Temperatures will stay mainly in the mid to upper 70s with a southerly breeze at 8 to 15 mph.
Tonight, the front slowly moves offshore and this will keep it mostly cloudy with a threat for a few lingering showers through the evening hours. Behind the front winds turn west to northwest with low temperatures falling to the low and mid 60s.
On Thursday the front will be far enough offshore to allow skies to clear up and we can look forward to a mainly sunny day with lower humidity and temperatures hanging around 80 degrees. Temperatures cool down to the upper 50s to low 60s at night under a mainly clear sky.
With high pressure moving out of the central portion of the country and toward New England it looks like another stretch of nice days lie ahead for Friday and Saturday. Highs around 80, overnight lows around 60.
There should be more clouds around on Sunday but it should stay dry with temperatures inching into the low 80s.
North Shore beach outlook:
Wednesday: Not the best of beach days with showers and storms about, locally heavy downpours possible and very little if any sunshine. High temperatures in the low to mid 70s. South winds 8 to 15 mph. High tide near mid afternoon. Moderate risk of rip currents with seas at 2 to 4 feet. Ocean temperatures about 64 degrees.