Identify the incorrect statement describing the processes which contribute to a major 'Polar Vortex' weather event, such as the one that occurred in the US midwest this Winter:
Select one:
a. low pressure areas in the Arctic keep cold air trapped in the North
b. high pressure warm air moves north to disrupt the strength of the Jet Stream
c. longer, lingering, meandering, persistent heat waves and cold spells move across higher & lower latitudes
d. increased speed of the Jet Stream creates Rosby waves with wider amplitudes
