Extreme Heat Warning

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the mid 90s to 106 with low temperatures in the 70s expected. For the Heat Advisory, high temperatures in the 90s to 102 expected.

* WHERE...San Diego County Valleys.

* WHEN...For the Extreme Heat Warning, until 8 PM PDT Wednesday. For the Heat Advisory, from 8 PM Wednesday to 8 PM PDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses.

* ADDITIONAL DETAILS...Major to locally Extreme HeatRisk. Elevated lows will limit overnight relief from the heat.