I’ve never seen it other than before/during bad weather, one way or the other. Here’s an interesting Scientific American article discussing the phenomenon:
Interesting article. Thanks for sharing. Having grown up in Marin Co. In the bay area, any lightning storm was a rare occurance. Then a trip to yucca valley and witnessing that green sky, shortly to be followed by the worst lighting storm I had ever experienced, well, needless to say I’m not a great fan of lightning storms. I remember seeing six bolts of lightning hit at once off in the distance that night. The storm lasted for hours.