* WHAT...DANGEROUSLY HOT CONDITIONS WITH HIGH TEMPERATURES AS HOT AS100 TO 110 FOR THURSDAY THROUGH SATURDAY AND LOW TEMPERATURES AS WARM AS THE MID 70S TO UPPER 80S FOR FRIDAY AND SATURDAY EXPECTED.

* WHERE...APPLE AND LUCERNE VALLEYS.

* WHEN...FROM 10 AM THURSDAY TO 8 PM PDT MONDAY.

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

* ADDITIONAL DETAILS...AREAS OF MAJOR HEATRISK. ELEVATED LOW TEMPERATURES WILL LIMIT OVERNIGHT RELIEF FROM THE HEAT.