A frontal boundary lies to our south right now and we are on the colder side of that front. Temps in the upper 50s and low 60s…unseasonably cold for this time of year. That cold air is firmly entrenched in Southern New England while at the same time warm, moist air is riding up and over the chill…the result, periods of heavy rain now through tomorrow midday. In addition to this overrunning, an area of low pressure has developed along the front and will travel up and over the Cape early tomorrow morning. This will focus tropical rain over SE and Eastern MA during tomorrow morning’s commute. Because of the copious rain potential, the National Weather Service has issued a Flash Flood Watch through midday Friday. Temporary street and parking lot flooding may be an issue.
The low will cruise out of here by the afternoon and drier air will begin punching in leading to partial afternoon clearing. We will be between storms on Saturday with great Summer weather to look forward to…sunshine, no rain and temps in the 80s. But another slow moving front will approach for the afternoon on Sunday. Very humid air will slide back in and we may even have some low clouds form along the beaches. Along with the humid air, a line of showers and thunderstorms will work in from the West for the second half of the afternoon. The front will get hung up over us during it’s passage and showers will linger into Monday.