Active AlertsDescanso, CA

What: Dangerously hot conditions with temperatures of 90 to 100.
Where: San Diego County Mountains.
When: Until 8 PM PDT this evening.
Impacts: Heat related illnesses increase significantly during extreme heat events.
Additional Details: Low temperatures 10 to 15 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.