By Paul Sancya, AP file Mary Hoefflin, left, and Lauren Densic hug after a 2010 tornado struck Millbury, Ohio, in June 2010. The Personal Localized Alerting Network (PLAN) will allow emergency officials to send geographically targeted text messages to cellphones in areas where danger threatens. "The traditional alerts on radio and TV are still important, and they will continue, but more and more,