* WHAT. Dangerously hot conditions with temperatures up to 95 to 110 possible each day. Warm overnight low temperatures generally in the 70s. * WHERE. A large portion of the Southern California mountains, foothills, and valleys away from the coast. * WHEN. From Friday morning through Wednesday evening July 24. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures up to 95 to 112 expected each day. Warm overnight low temperatures generally in the 70s. * WHERE. A large portion of the Southern California interior mountains, foothills, and valleys away from the coast. * WHEN. From 10 AM Friday to 10 PM PDT Wednesday. * IMPACTS. There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.