Is That Viral Quadruple Rainbow Picture Real?

This morning a picture tweeted by Nineteenth Amendment CEO Amanda Curtis on Long Island quickly went viral: It shows what looks like a quadruple rainbow! I got some folks asking me if it's real, and my immediate reaction is: Yup. Seriously, this doesn't look faked to me, because I've seen this sort of thing before. Double rainbows are fairly common (despite the meme). I've seen dozens of them; they're caused when the sunlight hitting raindrops is particularly bright. The primary rainbow (the one...