Table 2.  Cloud and Weather Type Definitions Used
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      	Shorthand                                                                    Extended
Level 	notation   	Meaning                 	Synoptic codes       	      codes#
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      	Tcc        	total cloud cover        	N = 0-9				0-8

      	Clr        	completely clear sky    	N = 0

      	Ppt        	precipitation            	ww=  50-75,77,79,80-99
       	D         	  drizzle                    	     50-59
       	R          	  rain                       	     60-69
       	S          	  snow                       	     70-75,77,79
       	Ts         	  thunderstorm,shower          		    	 80-99

Low                                       		CL=
      	Fg         	sky obscured by fog                 / with N=9 and ww=F*	11
      	St 	       	stratus                     	      6,7
      	Sc         	stratocumulus               	      4,5,8
      	Cu         	cumulus                     	      1,2
      	Cb         	cumulonimbus                          3,9,
                                                  		 or N=9 with ww=Ts	10

Mid                                       		CM=
      	Ns         	nimbostratus                        2,7, or N=9, with ww=DRS  12,11,10
                                       		            /  with ww=DRS and CL=0,7	10
                                             		    /  with ww= RS and CL=4-8	10
      	As         	altostratus 	                    1; 2 if not DRS
      	Ac         	altocumulus 		            3,4,5,6,8,9; 7

High                                      		CH=
      	Cs         	cirrostratus	                    5,6,7,8
      	Cic        	cirrus, cirrocumulus                1,4,9
      	Cid        	dense cirrus	                    2,3

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# Extended codes shown where they differ from synoptic codes.  In the extended code the 
value "-1", rather than "/", is used to signify missing information. * F represents the fog codes ww=10-12,40-49.