METEOROLOGICAL MEASUREMENTS 
9 JUNE 1943 
OFF BOON ISLAND 
HEIGHT, FEET 
§ 13 OCT 1943 
NEAR DEER ISLAND 
Ficure 5. M curves from the Massachusetts coast showing strong ducts. 
forecasting. They are particularly significant at 
coasts when off-shore winds or land and sea breezes 
are present. Sensitive and carefully calibrated 
anemometers with ordinary wind vanes prove 
adequate for measurements of this type. Special 
equipment such as supersensitive anemometers, 
developed for particular purposes such as chemical 
warfare problems, are not usually needed because 
the large area covered by radio transmission paths 
or radars renders too detailed measurements useless. 
“SJ 
/ 1105 
MARCH 9, 1944 
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HEIGHT, FEET 
0 
355 360 365 370 375 375 380 
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REPRESENTATIVE OBSERVED 
M CURVES 
A small catalogue of WM curves that have been 
actually measured in various parts of the world by 
means of the equipment described previously con- 
cludes this chapter. Most of the curves presented 
were taken over the ocean merely because the 
majority of experimental measurements have been 
made there. Experience indicates that there is not 
Ficure 6. M curves from Taboga Island near Balboa, Canal Zone. 
