Quadrant-Averaged Structure and Evolution Mechanisms of a Northeast Cold Vortex during Its Mature Stage  | 
	
|   Figure 4   Vorticity budget results units: 10 -10  s -2  during the mature stage of the NCCV 0000 UTC 3 July to 18 UTC 3 July 2013: a-d HAV; e-h VAV; i-l TIL; and m-p STR. Panels q-t show the quadrant-averaged vorticity budget terms units: 10 -10  s -2  at 500 hPa.  | 
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