DISASTER PREPAREDNESS: Alabama tornadoes: Storms show limits of warning sirens.

That’s why it’s good to have a weather radio. I have this one, and it’s been good. But some readers who have both say that this one is better.

UPDATE: Reader Jenny Parker writes: “Glenn, my weather radio (neither one of your links) wasn’t being reliable the other night, so we tried the Wx Alert USA app for our phones, and it was fantastic. We just programmed it to sound for tornadoes, but it will sound or message for whatever you like (only absent zombies, really). Gives off the hideous NOAA sound, sure to wake you from anything.” Hmm. I’ll have to give that one a try. Though the reviews seem uneven.