* WHAT...For the Heat Advisory, daytime temperatures up to 99

degrees today. For the Excessive Heat Warning, dangerously hot

conditions with temperatures up to 104 expected.

* WHERE...Calabasas and Agoura Hills, Santa Susana Mountains, and

Southeastern Ventura County Valleys.

* 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.

Drink plenty of fluids, stay in an air-conditioned room, stay out of

the sun, and check up on relatives and neighbors.