* WHAT...DANGEROUSLY HOT CONDITIONS WITH HIGH TEMPERATURES IN THE MID90S TO 105 EXPECTED. LOW TEMPERATURES WILL BE MOSTLY IN THE 70S.

* WHERE...ORANGE COUNTY INLAND AREAS.

* WHEN...UNTIL 8 PM PDT FRIDAY.

* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING EXTREME HEAT EVENTS.

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