National Weather Service issued an Extreme Heat Warning for San Diego County deserts, with dangerously high temperatures of 110 to 115. * Stay inside or shaded areas. Drink lots of water. * If you feel sick from the heat, call 9-1-1. * Never leave young children or pets alone in vehicles. Find a cool place to go and tips to beat the heat at www. coolzones. org . Visit the National Weather Service for information, updates, and a map.