Tornado Warning San Diego, Tornado Warning San Diego Weather News. A surprise tornado warning in Southern California was issued Tuesday. Most of Southern California has been under a tornado warning watch for Tuesday afternoon, from Los Angeles down to San Diego. A storm of heavy rains and winds hit Southern...Tornado Warning San Diego. The National Weather Service has issued a tornado warning to the following cities of northwestern San Diego County and southeastern Orange County includes the cities of Vista, Oceanside, Fallbrook, Encinitas and Carlsbad. The tornado was hit around 2:30 p.m until 3:15 p.m.