How’d you know that? You originally from the Plains states? I used to tell easterners about the green sky, and they’d laugh, until they saw it!
Here in Colorado, green like that has always been bad.
The US Geological Survey considers parts of Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming to be part of the Great Plains, the western most portion of the vast North American Interior Plains.