Table 1. Cloud Information Contained in Synoptic Weather Reports
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        Symbol       	Meaning                      	 Codes*
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          N		Total cloud cover            	 0-8 oktas
                                        		 9= sky obscured
          Nh        	lower cloud amount           	 0-8 oktas
          h         	lower cloud base height      	 0-9
          CL         	low cloud type                	 0-9
          CM         	middle cloud type             	 0-9
          CH         	high cloud type               	 0-9
          ww         	present weather               	 00-99
          Ix         	present weather indicator     	 1-6
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       * Any category for which information is lacking to the
         observer is coded as "/".