After a relatively comfortable July 4th, the extreme heat is returning to Massachusetts and the National Weather Service has issued a heat advisory because of how hot it will feel through Monday.The WBZ Weather Team is implementing a NEW NEXT Weather Alert given heat-related dangers ahead Sunday and Monday.

At 12:43 p.m. on Friday, the National Weather Service released a heat advisory valid from Sunday 7 a.m. until Monday 8 p.m. for Northern Worcester and Southern Worcester as well as Franklin, Middlesex,

Meteorologist Jacqueline Thomas says another hot, humid day can be expected Monday with highs in the 90s and a chance for afternoon thunderstorms.