...EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 9 PM PDT WEDNESDAY... * WHAT...Dangerously hot conditions with temperatures up to 100. Hottest across interior areas to downtown Los Angeles through Sunday. * WHERE...Los Angeles County Inland Coast including Downtown Los Angeles. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor ac