"The greatest impacts will be felt Tuesday evening into the overnight hours, where we'll be seeing winds sustained of 25 to 35 miles per hour, with gusts up to 40 to 50 miles per hour," Dunham said. "Can't rule out a very isolated spot that may see winds up to 60, so that would lead to downed trees and power outages."
He told WBZ NewsRadio that anyone considering going to the beach Tuesday or Wednesday should be careful with rip currents along South-facing beaches.
The expected time span between between 8 p.m. Tuesday to 3 a.m. on Wednesday, which could feel the worst effects of the storm. Dunham said with tropical storms that move onto land, tornadoes are not off the table.
"You cannot rule out the risk of seeing a tornado over the Eastern half of Massachusetts," Dunham said.
A tornado touched down in Western Mass. Sunday evening in Blandford. That storm system also made its way to Connecticut from eastern New York, according to WBZ-TV.
Following Wednesday morning, Dunham expects there might be remaining showers and a breeze, but the storm will be on its way to Maine.
According to the National Weather Service, Isaias is expected to make landfall as a hurricane in Florida Monday night.
(Photo: Tropical Storm Isais in Florida. Getty Images)