By CBS3 Staff

PHILADELPHIA (CBS) – Dangerous and potentially deadly heat is gripping the Delaware Valley. From Philadelphia to the Jersey shore, temperatures could feel like we are in the triple digits on Thursday. A heat health emergency in Philadelphia has been extended until Monday at 11 p.m.

Millions of people across the country are under heat alerts, including the Delaware Valley. Many areas could even break heat records over the weekend.

This afternoon is expected to be steamy with some scattered thunderstorms. The high will be 91 degrees but it will feel like a 100 degrees.

CBS3’s Meteorologist Lauren Casey says a storm which has a history of bringing pea-sized hail will be moving into the area around 2 p.m. Thursday.

Friday through Sunday is set to stay sunny, hazy and dry during the height of the excessive heat.

On Saturday, a forecast high temperature of 100 degrees would be the first 100-degree day in seven years in Philadelphia. Heat index values on this day could reach their highest level, possibly to 115 degrees.

Most of the region remains under an excessive heat warning until Sunday night.