The National Weather Service issued a tornado warning for all of San Diego County Tuesday afternoon, 10News reported.The warning was initially for several cities in the North County and was supposed to end at 2:30 p.m. However, the NWS expanded the warning to include the entire county and extended the end time to 3:15 p.m.According to the NWS' Doppler radar, a severe thunderstorm capable of producing a tornado was moving northeast at about 30 MPH.Experts said the safest place to be during a tornado is in a basement. If no basement is available, experts urge residents to seek shelter on the lowest floor of the building in an interior hallway or room such as a closet. A blanket or pillow should be used to cover your body, and experts said to always stay away from windows.People inside a mobile home or vehicle should evacuate them and get inside a substantial shelter. If no shelter is available, experts recommend laying flat in the nearest ditch or other low spot and covering your head with your hands.