15 
1. U. S. Weather Bureau First and Second Order stations, 
U. S. Naval Air Stations, U. S. Air Force Bases, and 
Canadian Meteorological Division Class I stations: 
ceiling height wind direction 
sky condition wind speed 
visibility air temperature 
present weather cloud types* 
obstructions to vision precipitation 
sea level pressure barometric tendency 
dew point unusual phenomena 
* Canadian Class I stations report cloud types in 
tenths of total sky covered; many record sunshine. 
2. U. S. Coast Guard installations 
a. Six-hourly reporting stations (data transmitted to 
U. S. Weather Bureau every six hours): 
sky cover ice, kind 
wind direction ice thickness 
wind speed ice, effect on navigation 
visibility ice, change 
present weather air temperature 
obstructions to vision temperature, wet bulb 
past weather water temperature 
waves, direction from sea level pressure 
wave period unusual phenomena 
wave height 
b. Four-hourly reporting stations (data retained at Coast 
Guard Headquarters, Washington, D. C.): 
wind direction present weather 
wind speed cloud types 
sea level pressure cloud direction 
air temperature cloud speed 
humidity lake state 
water temperature 
F. Second Page 
The "second pages" of Table 1 are pertinent only to those installa- 
tions which obtain hydrographic data. However, in order to maintain 
proper continuity, the serial numbers of all data sourcs, both meteor- 
ological and hydrographic, are entered on this page. 
The second column indicates the position in the Lake of the raw 
water intake. The first number refers to the distance (in feet) that the 
intake is located from the shore. The second number, enclosed in paren- 
theses, indicates the depth of the intake below the surface of the water 
in feet. This indicated depth must be taken as only an approximate 
figure in most cases, due to the difficulty in ascertaining the actual 
teference level used in computing the deprh. It is us’1illy the depth 
below mean lake level. 
