From tomorrow through Monday, the Los Angeles area is in for stifling heat, the National Weather Service says. "Life-threatening" temperatures could break records as they enter the triple digits, with Antelope Valley facing potential 115-degree heat. Los Angeles County is opening 89 cooling centers, the Los Angeles Times reports, and the Weather Service says people and pets should stay in the shade and any physical exertion should be restricted to the early morning or evening. (More National Weather Service stories.)