A NOAA Weather Radio.

I know it sounds strange, but hear me out. Florida is the lightning capital of the world. And also sees its fair share of tornadoes. I don't take it into the parks with me, but if I am gone and a weather alert is issued (a Watch or a Warning) when I get back my radio will let me know if one was issued via a digital readout.

And the National Weather Service updates it quicker than the Weather Channel.

Every room has smoke detectors, so why not a "Weather Detector"?