A Texas Amber Alert has been issued for Savanna Cardenas, a 15-year-old girl who was last seen in San Antonio, according to local officials. Anyone with information is urged to call 911 immediately. Savanna was last seen at around 6 a.m. on Thursday at 191 W Loop 1604 in San Antonio, according to the amber alert. Specific details about the circumstances of her disappearance were not immediately released. Savanna is believed to be with a 45-year-old unidentified female. She is only known to have blonde hair. They are believed to be driving in a silver Ford Fusion with unknown license plates. Sa…