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Programs that issue alerts, advisories and warnings to inform the public of an impending event such as a major fire, flood, hurricane or tornado which has the potential to cause loss of life, personal injury, property destruction or damage and wide-spread community disruption. Disaster warnings may include safety instructions for people who are likely to be affected by the event, may communicate information about measures, such as curfews, that the authorities have taken to minimize the effects of the incident, and may provide crucial information about the status of the physical environment (e.g., roads and bridges that are impassable) following the event.