Yes, I did it on purpose to show that the words used make them easy to reverse.

I think one word should be stronger, or unambiguous.

Tornado sighting

Tornado alarm

Tornado touchdown

Tornado lookout

Tornado conditions

Tornado possibility

I go by Elk crossing warning signs a lot. They display all the time, giving their warning, not just when there's a recent sighting.

It's like saying the "red/black" rhyme about coral snakes is fine. It is, if you remember it exactly. And it's also incredibly easy to mix it up.