Hazards Air Quality Cold Weather Communicable Diseases Earthquake Electric Outages Fire Heat Heat Severe Storms Terrorism Tornadoes Tsunamis Urban Flooding SFCityNow Forecast: Visit the National Weather Service for the updated forecast. Alerts: Sign up for AlertSF to receive emergency text alerts. Simply text your zip code to 888-777 or visit alertsf.org. Map Guide Expand Map SFDEM Updates From Twitter Tweets by SF_emergency Partner Updates From Twitter Tweets by SF_emergency Transportation Status From 511.org Tweets by SF_emergency