Your concern of not having an outdoor warning siren system is valid. As a fire chief, I would recommend that you contact the officials in each city in the county (mayor, fire chief, etc.) on your concerns. They could pressure the county to install, maintain and use a warning siren system.
It is really ridiculous not to have an outdoor warning system. Particularly in the parts of the county that have recreation area (parks, beaches, lakes, campgrounds, etc.) that have many visitors who are outside, no landline phones and need adequate warning to take shelter for inclement weather.
Your EMA director needs to wake up or get fired IMHO.
Well, our county has a few sirens, but there is only one in the city (which is a Sentry 16V1T-B) and it's located on the back side of Industrial Park. Our city has a very small system already in place, but we need more than just one siren in the city limits that is not in a low-populated industrial area. Elsewhere in the county, there is a Federal Model 5 at a VFD in Burns and another Federal Model 5 in White Bluff on a water tower. Those are still nowhere near the city limits of Dickson, their just in the county.