14 
E. Data 
Many meteorological data are obtained by U. S. Weather Bureau First 
and Second Order stations, Canadian Meteorological Division Class I sta- 
tions, U. S. Coast Guard installations, U. S. Naval Air Stations, and 
U. S. Air Force Bases. The distinctions between U. S. Coast Guard Sta- 
tions, as far as their meteorological observations are concerned, are 
made on page 15. U. S. Naval Air Stations and Air Force Bases are 
equipped and staffed to record the data called for by WBAN (Weather 
Bureau-Air Force-Navy) Form 10; hence, for the purposes of this report, 
they are placed in the same classification as U. S. Weather Bureau First 
and Second Order stations. 
The distinctions between U. S. Weather Bureau First and Second Order 
stations are as follows: First Order stations are staffed by full-time 
Civil Service personnel. The stations may or may not operate 24 hours 
per day, they may or may not be equipped with full instrumentation, 
hence they may or may not take special or synoptic observations. Those 
First Order stations that do not operate at all times or take full ob- 
servations are functionally important in the work of the Bureau; there 
are only one or two included in this report. Second Order stations are 
staffed by certificated personnel to take full synoptic weather observa- 
tions; they may or may not be Civil Service personnel. Examples of 
Second Order stations are U. S. Coast Guard Stations and Civil Aeronau- 
tics Administration communications stations at airports otherwise without 
Weather Bureau personnel. 
A substation of the U. S. Weather Bureau is staffed by a volunteer 
individual or organization to make at least one observation per day. He 
is furnished with equipment to record precipitation and/or temperature 
extremes; he may or may not have equipment for measuring additional 
weather elements. This type of data source is referred to in this report 
as a USWB Cooperative. 
The Canadian Meteorological Division Class II station also fits this 
description. Canadian Class III stations are equipped only with a rain 
gauge; Canadian c stations are equipped only with a sunshine recorder 
and/or an anemometer. These stations are referred to in this report, 
respectively, as CMD I, CMD II, CMD III, and CMD c. 
To avoid lengthy repetition of citing the data in the tabulations 
that are recorded by USWB First and Second Order stations, CMD Class I 
stations, and U. S. Coast Guard, Naval Air, and Air Force stations, the 
parameters taken by each group are specified below. In Table I, a page 
and paragraph reference is given in the Other column under Meteorological 
Data, referring to the following parameters measured at each station: 
