midnight blizzard is kind of a spoof.
know one knows why. if you find 2 "midnight blizzards" and breed them you will get normal blizzards.
no one knows if its cause by temps or if its actually a genetic thing.
It could be a Murphy Patternless. They can be brown with a purplish tail and as adults look almost identical to blizzards. You should have more of an idea after its been properly cared for and lightens up in a few weeks.