Columns 6^-66 CLOUD TYPE MD AMOUM' 



Enter type (genus) of cloud in Column 65 according to WMO Code O5OO 

 shown in Table 25- 



Enter cloud amount (fraction of the sky covered by clouds) in eights 

 in Column 66 according to WMO Code 2700 shown in Table 26. 



Column 67 VISIBILITY 



Enter visibility according to WMO Code U3OO shown in Table 27. 



Columns 68-72 SPECIAL OBSERVATIONS 



Special observations may be entered in this field; however, the ori- 

 ginator must indicate in the Remarks space of the data form the nature of 

 the special observations, decimal places, units, and/or codes used. When 

 reporting special observations, enter a red dash in Column 72. As mentioned 

 previously, these columns also may be used for the continuation of the 

 originator's station number when exceeding three digits (see page J, Columns 

 31-33, ORIGINATOR'S STATION NUMBER), but in this case no other information 

 may be placed in this field. 



Columns 73-80 PROCESSING NUMBERS 



No entries are required on the coding form. The Cruise Number 

 (Columns 73-75) is assigned by the NODC. These numbers are unique within 

 each country. The entry in Columns 73-75 is combined with the entry in 

 Columns 1-2 and, together, they comprise the NODC Reference Identity Number. 



The NODC assigns numbers to each station consecutively in the order in 

 which they are submitted on the coding form or in the order in which they 

 appear in published source material. 



The NODC enters the numeral one (l) in both the coding fonn and the 

 punch card to identify the station Master Card. 



10 



