* WHAT...Temperatures of 90 to 110 degrees, hottest on Wednesday and over interior areas.
* WHERE...A portion of southwest California.
* WHEN...From 10 AM Tuesday to 8 PM PDT Thursday.
* IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.
* ADDITIONAL DETAILS...Humid conditions will add to the heat to potentially worsen heat impacts. Effects of the heat will build through the week, with warm overnight low temperatures providing little relief from the heat.