TABLE 23 (Cont'd) 

 Conversion from 1936 International Meteorological Organization Code to the 



WMO Code il501 



30 

 31 

 32 

 33 

 3^ 

 35 

 36 

 37 

 38 

 39 



1^0 

 Ui 

 k2 



h3 

 kk 



hi 

 h9 



50 

 51 

 52 

 53 

 5i^ 

 55 

 56 

 57 

 58 

 59 



DUST STORMS AKD STORMS OF DRIFTING SNOW 

 (Visibility less than 1,000 m., 1,100 yards) 



Dust or sand storm. 

 Dust or sand storm, has decreased. 

 Dust or sand storm, no appreciable change. 

 Dust or sand storm, has increased. 

 Line of dust storms . 

 Storm of drifting snow. 

 Slight storm of drifting snow- 

 Heavy storm of drifting snow 

 Slight storm of drifting snow 

 Heav;y storm of drifting snow 



generally low. 

 generally high. 



WMO 

 Code 

 4501 

 (equivalent) 



3 

 3 

 3 

 3 



3 

 3 

 3 

 3 

 3 



FOG 



(Visibility less than 1,000 m., 1,100 yards) 



Fog. 



Moderate fog in last hour | ^^^ ^^^ ^^ ^^^ ^^ observation. 

 Thick fog in last hour ) 



I has become thinner during last hour. 

 I no appreciable change during last hour 



( 



Fog, sky discernible 



Fog, sky not discernible 



Fog, sky discernible 



Fog, sky not discernible 



Fog, sky discernible 



Fog, sky not discernible 

 Fog in patches. 



has begun or become thicker during 

 last hour 



DRIZZLE 

 (Precipitation consisting of numerous minute drops) 



Drizzle 



Intermittent 



Continuous 



Intermittent 



Continuous 



Intermittent 



Continuous 



Drizzle and fog. 



Slight or moderate | ^^^^^^ ^^ ,,^1^. 



Thick ) 



slight drizzle, 

 moderate drizzle, 

 thick drizzle. 



k 

 k 

 k 



k 

 k 

 k 

 k 

 k 

 k 

 k 



5 

 5 

 5 

 5 

 5 

 5 

 5 



5 

 5 



67 



