* WHAT...Dangerously hot conditions with temperatures in the middle to upper 90s possible. Hottest Wednesday.
* 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...From 8 AM Tuesday to 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.
* ADDITIONAL DETAILS...Higher humidity will have the potential to add to the heat discomfort in the afternoons. Temperatures are expected to cool slightly after Thursday.