Sonoma County’s top elected and administrative leaders all agree if another major disaster struck the region today, one key aspect of their response would be different than when the historic wildfires ignited five months ago: They’d use mass cellphone alerts to warn the public about the emergency. And if rainfall from this latest storm triggered dangerous debris flows in the county’s fire-scarred hillsides, a team of designated staff members would immediately jump into action. Officials are already prepared to send targeted emergency alerts at a moment’s notice to residents living in areas burned during the October wildfires, according to County Administrator Sheryl Bratton.