Most of Massachusetts is under a heat advisory through Wednesday, and forecasters are urging residents to look out for the high temperatures.

Mass General Brigham is partnering with IBM on an artificial intelligence tool to send bespoke heat alerts to the patients most at risk.

The Storms Prediction Center has placed portions of our entire area in a "slight" risk, or level 2. The SPC also has increased the risk of some damaging, straight-line winds Friday afternoon and evening, particularly from Worcester County and areas south-westward.

Widespread heat indexes of 105 or higher will cover the eastern Plains, the Midwest, Mid-South and Southeast including Florida. Similar conditions are expected up the East Coast to the east of the Appalachians,

Tuesday is shaping up to be our hottest day of the week. Thermometers will climb into the mid to upper 90s in the afternoon. When factoring in humidity, it’ll feel right at or above 100 degrees.

Mayor Michelle Wu declared a heat emergency for Boston from Wednesday through Friday, with the heat index predicted to fluctuate from 91 to 97 degrees with little overnight relief, the city announced.

A heat advisory is in effect in Boston and several other Massachusetts communities through 7 p.m. on July 17. The National Weather Service warned of "dangerous heat and humidity" with heat indices soaring to 95 to 100 degrees. Boston Mayor Michelle Wu also declared a heat emergency for the City of Boston from July 16 to 18.

Extreme heat is returning to Massachusetts starting Monday and Boston could see its third heat wave of the summer this week. The WBZ Next Weather Team has issued a Next Weather Alert for the heat.A Heat Advisory goes into effect for most of Massachusetts on Monday at 11 a.