Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

* WHAT...For the Heat Advisory, daytime temperatures up to 97 degrees today. For the Excessive Heat Warning, dangerously hot conditions with daytime temperatures up to 105 degrees. * WHERE...Eastern Santa Monica Mountains Recreational Area and Western Santa Monica Mountains Recreational Area. * WHEN...For the Heat Advisory, until 10 AM PDT Wednesday. For the Excessive Heat Warning, from 10 AM to 8 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. * ADDITIONAL DETAILS...Overnight low temperatures will offer little reprieve from the heat.