'Extremely Dangerous Heat' To Envelop East Coast, Including MA

MASSACHUSETTS — Is it a new heat wave, or just a continuation of the last one?

Temperatures will rise to potentially dangerous levels again across Massachusetts this week, with another round of heat set to scorch the Eastern seaboard through Wednesday, according to the National Weather Service.

Temperatures between Worcester and Boston could peak in the mid-90s on Tuesday, book ended by temperatures still in the 90s on Sunday, Monday and Wednesday, forecasts show. But adding humidity, heat indices could range between 95 and 100 during the first half of the week.

"Confidence is increasing in extremely dangerous, potentially deadly heat, particularly for urban areas in the Southeast and East Coast beginning Monday," the National Weather Service Weather Predication Center said. "Many daily record highs are possible for the East Coast, and numerous warm overnight lows will provide little relief from the heat overnight. Heat stress will build rapidly for those without adequate cooling or hydration."

The National Weather Service Weather Predication Center has Massachusetts in its "major" heat risk category — the second-highest risk level — for July 13 to 17. The National Weather Service in Boston on Friday indicated heat advisories could come as early as Sunday.

Here are the maximum temperatures we could see:

The peak temperatures on Tuesday may be enough to break local records. Boston's record high for July 16 came in 1983 at 99 degrees. It's possible Worcester could more easily break a record for July 16, with the highest recorded temperature for that date measured in 1901 at 92 degrees.

Massachusetts will, however, be one of the cooler spots along the East Coast. Cities like Raleigh, NC, and most of New Jersey will see temperatures at about 100 during the peak of the new wave — but heat indices will make it feel like about 110 in those areas.