The skies above #NorthFortMyers, #Florida, were graced with a fleeting sight that only the most observant #weather watcher can spot. Tony Greene captured a #horseshoe vortex #cloud formation on Nov. 16 after a bout of unsettled weather. While this beautiful little cloud won't produce any rain, it will shower luck on those who spot it. It's considered one of the world's rarest cloud formations and one of the fastest clouds to disappear. Certain weather conditions must be perfectly aligned for this unique cloud to form. #flwx