Rare Wave-Like Clouds Crest Over Pa. Turnpike

PITTSBURGH (KDKA) – While clouds are nothing new to Western Pennsylvania, some pretty rare clouds were spotted over the Turnpike.
KDKA viewer Ken Jones captured a photo of rare wave-shaped clouds that he saw over the Turnpike on the way to Philadelphia.(Photo Credit: Ken Jones)
KDKA meteorologist Ray Petelin says these are Kelvin-Helmholtz clouds, “a very rare cloud pattern that is caused by velocity shear.”
“Velocity shear occurs when winds are traveling at different spe