106 MANUAL OF MARINE METEOROLOGICAL OBSERVATIONS 



CODE TABLE 7 



Symbol W — Past weather 



Code 

 figures 



Description 



Cloud covering ],i or less of the sky through- 

 out period. 



Cloud covering more than \i of sky during 

 part of period, and less than }i during part 

 of period. 



Cloud covering more than }i of sky through 

 out period. 



Sandstorm or diiststorm or blowing snow. 



Fog or ice fog or thick haze. 



Drizzle. 



Rain. 



Snow or rain and snow mixed or ice pellets. 



Shower(s), 



Thunderstorm (s) withor without precipitation 



Notes 



1. In 0000, 0600, 1200 and 1800 G. C. T. reports "Past Weather" cover? the 

 preceding 6-hour period while in 0300, 0900, 1500, and 2100 G. C. T. reports, "W" 

 covers the preceding 3-hour period. 



2. The code figure for "W" is selected in order that "W" and "ww" together 

 give as complete a description as possible of the weather in the time interval 

 concerned. For example, if the type of weather undergoes a complete change 

 during the time interval concerned, the code figure selected for "W" wiU describe 

 the weather prevaihng before the type of weather indicated by "ww" began. If 

 however more than one code figure may be given to W with regard to past weather, 

 the higher code figure is reported. 



