* WHAT...FOR THE HEAT ADVISORY, HIGH TEMPERATURES IN THE 90SEXPECTED. FOR THE EXTREME HEAT WARNING, DANGEROUSLY HOT CONDITIONS WITH HIGH TEMPERATURES IN THE MID 90S TO 104 EXPECTED.

* WHERE...SAN DIEGO COUNTY MOUNTAINS COUNTY.

* 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.

* ADDITIONAL DETAILS...LOW TEMPERATURES 5 TO 10 DEGREES ABOVE NORMAL WILL LIMIT RELIEF FROM THE HEAT. INCREASING TEMPERATURES INTO THE MIDDLE OF NEXT WEEK WILL INCREASE THE THREAT OF HEAT-RELATED ILLNESS ACROSS POPULATIONS.