Here's a little green flash I caught last night. I almost missed it because I was taking a series to show what it looks like when it's going to FLASH and the dang camera was taking its own sweet time downloading the next-to-last shot. Some green flashes are greener than others. This is a yellowish, smallish green flash, but still counts. The picture was taken about 1/2 a second past the flash's prime. By all means click on the thumbnail and take a close look at it.
Green flashes are actually pretty common in the spring and fall, when the atmosphere is dry and relatively cloudless. During the summer you don't see many flashes because they're hidden by clouds building up over the Gulf of Mexico. I wonder if y'all Left Coasters see many of these?
Maybe it should be called something besides the "green flash", something like the "emerald wink" or the "don't blink or you'll miss it", or the "no, it's not an after-image on your retina", or "look, it only lasts for a second or less, so don't turn away and start arguing about it." Maybe there would be fewer nonbelievers then.