* WHAT...For the Heat Advisory, temperatures between 93 to 103 expected. For the Extreme Heat Watch, dangerously hot conditions with temperatures between 97 and 107 possible. * WHERE...A portion of southwest California. * WHEN...For the Heat Advisory, from 10 AM to 8 PM PDT Wednesday. For the Extreme Heat Watch, from Wednesday evening through Monday evening. * 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. There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.