Rossby wave

Rossby wave, in meteorology, large horizontal atmospheric undulation that is associated with the polar-front jet stream and separates cold polar air from warm tropical air. These waves are named for Carl-Gustaf Arvid Rossby, who first identified them and explained their movement. Rossby waves are formed when polar air moves toward the Equator while tropical air is moving poleward. Because of the temperature difference between the Equator and the poles due to differences in the amounts...