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Police explain new WeatherWarn siren activations as residents report confusion
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Summary
The chief of police told trustees the village joined a multi-jurisdiction WeatherWarn system and that National Weather Service guidance now allows siren activations for 70 mph straight-line wind events as well as tornado warnings; trustees and residents raised concerns about inconsistent voice messages and phone alerts.
The chief of police briefed the Village Board on April 21 about recent siren activations after Vernon Hills joined a consortium-based WeatherWarn activation system shared with neighboring jurisdictions.
He said the National Weather Service updated guidance in August 2025 to expand the kinds of severe events that can justify community siren activation and that the village's new system is linked to NWS tracking. "When the National Weather Service determines that part of our community is in the path of a severe weather event, these sirens activate," the chief said, adding that thresholds now include a "considerable severe thunderstorm warning" tied to straight-line winds of about 70 mph as well as tornado warnings.
The chief emphasized that sirens are intended primarily to alert those outdoors to seek shelter and that the system can deliver a prerecorded "take shelter" message or allow live messages when needed. He acknowledged the change may cause more frequent activations but said the village will continue shared public messaging and reassess activation thresholds with partner agencies.
Residents and trustees described confusion when sirens sounded without an audible voice message and noted that phone-based wireless emergency alerts can trigger at a higher threshold (an 80-mph "destructive thunderstorm" designation), which can create situations where sirens sound but phones do not. Trustee Schenck and other board members stressed the need for clearer public education about what different activations mean and urged the village to coordinate messages with schools and social media.
The chief said staff will continue to push common messaging across jurisdictions and to discuss thresholds with partner chiefs; he also advised residents to use TV, radio, weather radios or other personal devices for more detailed guidance after a siren activation.
Next steps: Police and partner emergency-service leaders will continue to review activation thresholds, and the village will expand public communications to explain the updated system.
