Weather Code. If preceded by an X, weather is coded according to Table 3. 

 A numeric two-digit entry indicates weather according to WMO Code 4677. 



Cloud Codes. 



Type. Cloud type is coded according to Table 4. 

 Amt. Cloud amount is coded according to Table 5. 



NODC Station Number. This number is assigned by NODC for data storage- 

 retrieval purposes. The reference and NODC station number combined, uniquely 

 define each station in the NODC archives. 



Water. 



Color Code. Water color is given according to the Forel-Ule code in 



Table 6. 



Trans, (m). Transparency in meters as determined by Secchi disk. 



Wind. 



Dor. Direction from which the wind is blowing, in tens of degrees, 

 according to Table 1. 



Speed or Force. If preceded by S, wind speed is in knots; if preceded 

 by F, wind force is coded according to the Beaufort Code. 



Barometer (mbs.). Barometric pressure of the atmosphere is coded in mil- 

 libars with the hundreds and thousands digits omitted. (Range 945.1 to 

 1044.7). 



Air Temp. °C. 



Dry bulb. Dry-bulb air temperature to the nearest tenth of a degree 



Celsius. 



Wet bulb. Wet-bulb air temperature to the nearest tenth of a degree 



Celsius. 



Vis. Code. Visibility is coded according to Table 7. 



Messenger time or Cast no. The time (GMT) of release of the messenger is 

 given in hours and tenths of hours. If a multiple cast series extends past 

 midnight (GMT), 24 hours are added to those times. If the messenger time is 

 not given, the cast number is entered in this column. 



Card type. 



OBS . Indicates an observed or sample depth. 



STD. Indicates an interpolated standard depth. Interpolation of temper- 

 ature, salinity, oxygen, etc., computed by a modified 3-point LaGrange 

 formula. 



*STD. Indicates standard depth interpolation by the originator or by 

 hand at NODC. 



LIT. Interpolated standard depth values; original observed values not 

 available. 



Note: Both OBS. and STD. lines are printed when a valid observed level 

 and a standard level coincide. 



48 



