“the jet stream forms a boundary between the cold north and the warmer south, but the lower temperature difference means the winds are now weaker.
“the jet stream forms a boundary between the cold north and the warmer south, but the lower temperature difference means the winds are now weaker.
jet stream:62
jet stream
if two air masses, one cold and dense to the north and the other hot and less dense to the south, are separated by a vertical boundary and that boundary should be removed, the difference in densities will result in the cold air mass slipping under the hotter and less dense air mass.