Sign up for San Francisco Fleet Week emergency text alerts from AlertSF. Simply text FLEETWEEKSF to 888-777 to sign up for emergency text message alerts. AlertSF will send alerts and instructions following a natural disaster, major police, fire, or health emergencies, or significant transportation disruptions to your mobile device. AlertSF is a service provided by the San Francisco Department of Emergency Management. Visit www.AlertSF.org to learn more.