* WHAT...FOR THE HEAT ADVISORY, HIGH TEMPERATURES IN THE 90S IN THEWESTERN VALLEYS TO AROUND 105 IN THE FAR INLAND VALLEYS. FOR THE EXTREME HEAT WARNING, DANGEROUSLY HOT CONDITIONS WITH HIGH TEMPERATURES IN HE UPPER 90S TO 109 EXPECTED.

* WHERE...SAN DIEGO COUNTY VALLEYS.

* WHEN...FOR THE HEAT ADVISORY, UNTIL 10 AM PDT TUESDAY. FOR THE EXTREME HEAT WARNING, FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY.

* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING EXTREME HEAT EVENTS. HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.