When emergencies hit, San Francisco plans to be ready with information citizens need to respond appropriately. As a report on the Emergency Management website explains, Crisis Mode is an online crisis map developed by Google's charitable arm, Google.org, in conjunction with SF emergency preparedness officials.
In the event of a major fire, for instance, the map would show a warning and pinpoint streets to avoid due to fire activity. In a more massive emergency like an earthquake, the map would show street closures but also other pertinent details, for example shelter locations with updates as new shelters open.
Tweets providing updates from FEMA and the city's Department of Emergency Management will be displayed on the map, along with unofficial ones crowdsourced from other Twitter accounts.