Extreme Heat Warning

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the upper 90s to mid 100s on Thursday with morning low temperatures in the 70s and lower 80s expected.

* WHERE...San Bernardino and Riverside County Valleys-The Inland Empire.

* 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.