What: Dangerously hot conditions with increased relative humidities and temperatures up to 115, or locally higher, possible.
Where: Coachella Valley and San Diego County Deserts.
When: From 10 AM Wednesday to 8 PM PDT Thursday.
Impacts: Heat related illnesses increase significantly during extreme heat events. Risk for heat-related illnesses for most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.