Extreme Heat Warning

* WHAT...High temperatures 100 to 103 degrees in the valleys each afternoon. Low temperatures 60 to 65 degrees in the valleys each night. This will result in a major risk for heat-related illnesses for much of the population, especially those without effective cooling.

* WHERE...Humboldt County.

* WHEN...For the Heat Advisory, until 6 AM PDT Friday. For the Extreme Heat Warning, from 6 AM to 11 PM PDT Friday.

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