Maximum 12-Hour Deepening (mb) 

 Travelling Cyclones only 



16 



12 



8 



nl 



Continental 

 Cyclones 



tlL. 



16 12 8 4 0-4 -8 -12 -16 

 Filling Deepening 



Atlantic Cyclones 



ITm-iir4l1 



jh 



4 ,0 -4 -8 -12 -16 -20 -24 -28 

 Filling . Deepening 



Figure 7. Maximum 12-hr deepening (positive numbers indicate filling) distri- 

 bution of traveling cyclones forming west of the Appalachians (con- 

 tinental cyclones) and east of the Appalachians (Atlantic cyclones) 

 (from Neilsen and Dole (1992)) 



Chapter 2 Operational Analysis Depictions 



11 



