DATA PROCESSING SEABIRDS — KING, WATSON, GOULD 



25 



Within sight during the 

 last hour. 



y Not falling as showers. 



17 Thunder heard, but no pre- 



cipitation at the ship. 



18 Squall(s) 



19 Funnel cloud(s) (tornado or 



waterspout). 



20-29 Precipitation, fog or thunderstorm at the ship during the pre- 

 ceding hour but NOT at the time of observation. 



20 Drizzle (not freezing). 



21 Rain (not freezing). 



22 Snow. 



23 Rain and Snow. 



24 Freezing drizzle or freezing 



rain. 



25 Shower(s) of rain. 



26 Shower(s) of snow, or of rain 



and snow. 



27 Shower(s) of hail or of hail 



and rain. 



28 Fog. 



29 Thunderstorm (with or without 



precipitation). 

 30-39 Duststorm, sandstorm or drifting snow. 



30 Slight or moderate duststorm Has decreased during 



or sandstorm. 



31 Slight or moderate duststorm 



or sandstorm. 



32 Slight or moderate duststorm 



or sandstorm. 



33 Severe duststorm or 



sandstorm. 



34 Severe duststorm or 



sandstorm. 



35 Severe duststorm or 



sandstorm. 



36 Slight or moderate drifting 



snow. 



37 Heavy drifting snow. 



38 Slight or moderate drifting 



snow. 



39 Heavy drifting snow. 



preceding hour. 



No appreciable change dur- 

 ing preceding hour. 



Has increased during 

 preceding hour. 



Has decreased during 

 preceding hour. 



No appreciable change dur- 

 ing preceding hour. 



Has increased during 

 preceding hour. 



Generally low. 

 Generally high. 



