India, June 21 -- A big wave of dangerous heat is about to hit much of the US starting Friday. The National Weather Service says it will be the first major heat wave of the summer, and it's going to feel extremely hot in many places - like over 100 degrees.

"Summer has taken its time arriving in the Northeast, but it's coming in HOT," the NWS wrote in a post on X. "Triple-digit heat indices will be common through next week, with oppressive humidity."

"Record-breaking heat will be dangerous to those working and playing outdoors so take precautions," it added.

In Philadelphia, the city gave a code red warning to help move homeless people inside, as per WHYY reports. This happens when the heat index is expected to be over 95 degrees for t...