* WHAT...Dangerously hot conditions with temperatures in the low to mid 90s. Locally in the upper 90s.
* WHERE...Eastern San Fernando Valley, Eastern San Gabriel Mountains, Los Angeles County San Gabriel Valley, Santa Clarita Valley, Western San Fernando Valley, and Western San Gabriel Mountains and Highway 14 Corridor.
* WHEN...Until 9 PM PDT Thursday.
* IMPACTS...There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors.