Extreme Heat Warning

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures of 90 to 100 on Thursday. Morning low temperatures in the 70s expected.

* WHERE...Orange County Inland Areas.

* WHEN...Until 8 PM PDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat events.

* ADDITIONAL DETAILS...Major HeatRisk through today. Moderate to major HeatRisk on Thursday. Warm overnight temperatures will limit relief from the heat.