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How Missoula County sends alerts: geotargeted Smart911, wireless emergency alerts and thresholds
Summary
Missoula County OEM explained alert thresholds—low advisories, geotargeted Smart911 notices for affected households, and countywide wireless emergency alerts reserved for the most serious incidents—and why residents should register and understand the difference.
Adrienne Beck explained that Missoula County uses a tiered alert system. At the lowest level are advisory messages (for example, traffic issues) that do not force a notification; at the middle level are geotargeted Smart911 alerts tied to registered addresses; and at the highest level are wireless emergency alerts (WEA) broadcast via the Integrated Public Alerts and Warning System for incidents that justify countywide disruption.
Beck said geotargeting is useful when only a small set of homes is threatened: “For an evacuation warning, for example, we put out a geotargeted smart 911 alert yesterday evening to notify the 8 to 10 homes that were in that evacuation warning area instead of sending a wireless emergency alert, which would light up the entire county for those 8 people,” she said. She recommended Smart911 registration to ensure residents receive alerts relevant to their specific residence.
The director also described how WEAs are delivered based on cell-tower coverage and do not require registration, but noted those alerts are reserved for the most disruptive events and are controlled at the federal level through the Department of Homeland Security’s systems.
