FOG 
changes during the formation of fog. It is true that good 
work has been done along these lines at the University 
of California at Los Angeles, but it has dealt with a 
very specialized type of fog—the Southern California 
stratus. Elsewhere, the almost universal rule is that 
no use whatever is made of these elements either in 
understanding the causes of, or in forecasting, fog. 
Tt is highly significant that radiosondes are almost 
never used by workers in this field, yet this approach 
must offer rich possibilities. Perhaps, however, such 
use would require a method of obtaining more detailed 
information in the lowest 100 mb of the atmosphere. 
Winds in the lowest few thousand feet have been 
used extensively in synoptic fog research and are of 
obvious importance. Yet our knowledge of the diurnal 
changes in wind direction and velocity and, what is 
really the same problem, the relation of vertical wind 
sheer to stability considerations, is still far from a 
practical solution. 
A field that might be productive to some extent is 
that of surface characteristics. The different radiative 
properties of various ground covers and the day-to-day 
variations in lake and ocean temperatures, while cer- 
tainly not neglected, have never received the attention 
which they perhaps merit. 
Tt is particularly true of fog, as it is generally of most 
phases of meteorology, that no great discovery is about 
to solve all the problems, or even cause any sensational 
advance. Continued work on the physical aspects of 
the problem will be necessary for advancement and, 
at the same time, a great deal of so-called “pick and 
shovel” work in applied synoptic meteorology is ab- 
solutely essential if real progress is to be made. 
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oo 
rs 
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