OBJECTIVE WEATHER FORECASTING 
of the considerable amount of subjectivity that may 
appear in the graphical analysis. More rigorous methods 
are needed, although it must be noted that difficulties 
seem to arise only when scatter diagrams are analyzed 
with too few data, or when there is no rational physical 
model underlying the selection of variables and the 
pattern of isograms drawn on the scatter diagram. 
In spite of these difficulties, the methods illustrated 
in recent literature have had a rather astonishing suc- 
cess in producing useful forecasts, and it can be recom- 
mended that more forecasters attempt such mvestiga- 
tions of their own local forecasting problems. 
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