Hey, what's that sound? Well, it's a sound everyone should know, so PLEASE SHARE THIS VIDEO. The new Hi-Lo Siren is a European Siren that will be used throughout Napa, Sonoma, Solano and Lake Counties. This "unfamiliar sound" will have a major role in alerting the public of emergencies. The plan was developed by Napa County Sheriff John Robertson and we are thrilled our neighboring counties have joined us in implementing this siren which enhances communication during disasters. The Bay Area Media (KTVU, KGO, KPIX, KRON4, NBC Bay Area, Univision, Telemundo, KCBS, KQED, The Napa Valley Register and Vallejo Times Herald were at our office to cover this story today. We want to thank the media for helping us get the word out to the public.