Kelvin-Helmholtz Waves In Fairbanks, AK

Here is a fun picture of Kelvin-Helmholtz waves near the surface at Fairbanks, AK, in December (I received it on 12/16). The diametrically-opposed power plant plumes, the higher one at the left, and the lower one on the right, help make this photo a unique teaching aid regarding the cause of Kelvin-Helmholtz waves, namely, opposed wind directions at different heights create wind shear that generates waves in stable air:

Downtown Fairbanks as viewed looking southward from the Borough's webcam on Cranberry Ridge. Left side plume is from the Aurora downtown power plant, blowing westward, and right side plume is from the University power plant blowing eastward.