Severe storm just popped up out of the blue. If I wind up in Oz, do NOT come rescue me!!!

I don't know why, but every time somebody makes an Oz reference, I feel the need to share a bit of knowledge I learned several years ago. During an F5 tornado, the clouds are known to turn green. The slang term for this is the Emerald City. Presumably, Mr. Baum was aware of this.