Highly likely (probability greater than around 85%) or certain Possible but not likely (probability less than or equal to around 50%) Not expected to occur (probability around 0) likely (probability greater than around 50%) Certainty unknown Pollution and other environmental Fire suppression and rescue Geophysical (inc. landslide) Medical and public health Utility, telecommunication, other non-transport infrastructure Meteorological (inc. flood) Other events Rescue and recovery General emergency and public safety Law enforcement, military, homeland and local/private security Public and private transportation Extraordinary threat to life or property Minimal threat to life or property Possible threat to life or property Significant threat to life or property Severity Unknown Refers to an event that is moderately probable in the near future Refers to an event that is imminent (within next hour) Refers to an actual event that has occurred recently or is occurring Refers to an event that occurred in the past (not requiring further action) Urgency not known