* WHAT...Dangerously hot conditions with high temperatures ranging from the low 80s to low 90s at the beaches to the uppers 90s for the mesas and other higher coastal terrain. Nights will be very warm with low temperatures in the low 70s.
* WHERE...San Diego County Coastal Areas.
* WHEN...Until 8 PM PDT Thursday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat events.