The National Weather Service warns that hot conditions around 100 degrees will be present for the San Diego County Valleys today from 10:00 a. m. to 8:00 p. m. * Stay inside or in 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 more information, updates, and a map.