TROPICAL CYCLONES 
tion of all observational data from tropical cyclones for 
statistical and physical analysis is badly needed. Evi- 
dence is far from conclusive about the actual facts with 
respect to the shape of inner isobars, the symmetry or 
asymmetry of distribution of certain elements around 
the storm, pressure-gradient and wind relationships, 
and many other characteristics which are taken more 
or less for granted at the present time. 
2. Further studies are required to determine the 
exact relationship between the computed cyclostrophic 
term of the gradient wind and the observed wind, as a 
function of wind direction, velocity, storm movement, 
and other characteristics. More data on the actual pres- 
sure-gradient and wind-velocity relationships are 
needed. 
3. Theories on the exact mechanics of evacuating 
air from the storm area are mainly deductive in nature, 
and data are insufficient to substantiate or disprove 
them. It should not be too difficult to obtain the neces- 
sary data from properly equipped airplanes. 
4. A flight by Wexler [21] into a tropical cyclone in a 
plane equipped with a radio altimeter indicated areas 
of convergence considerably at variance with the nor- 
mal concept of convergence and divergence in the 
storm area. It should be noted, however, that the 
storm was in an advanced stage of recurvature. Again 
the accumulation of data required for an answer to 
this question should not be difficult. Traverses should 
be made into storms at lower latitudes. 
5. By means of planes or parachute radiosondes, 
more observational data, including rate of descending 
air, should be secured from the eye of the storm. 
REFERENCES 
1. Cuine, I. M., Tropical Cyclones. New York, Macmillan, 
1926. 
2. DEPPERMANN, C. H., Some Characteristics of Philippine 
Typhoons. Manila, Bureau of Printing, 1939. 
3. —— Outlines of Philippine Frontology. Manila, Bureau of 
Printing, 1936. 
4. —— “Notes on the Origin and Structure of Philippine 
Typhoons.” Bull. Amer. meteor. Soc., 28: 399-404 (1947). 
901 
5. Dunn, G. E., Brief Survey of Tropical Atlantic Storms. 
Univ. of Chicago, Inst. of Tropical Meteor., Rio Piedras, 
P.R., 1944. 
6. Durst, C.§., and Surcuurre, R. C., “The Importance of 
Vertical Motion in the Development of Tropical Re- 
volving Storms.” Quart. J. R. meteor. Soc., 64: 75-84 
(1938). 
7. GuErzI, H., Typhoons of 1936. Zi-ka-wei Observatory, 
Shanghai, China. 
8. GUTENBERG, B., ‘‘Microseisms and Weather Forecasting.” 
J. Meteor., 4: 21-28 (1947). 
9. Havurwitz, B., “‘Internal Waves in the Atmosphere and 
Convection Patterns.”” Ann. N. Y. Acad. Sci., 48: 727- 
748 (1946). 
10. —— ‘The Height of Tropical Cyclones and of the ‘Eye’ 
of the Storm.’’ Mon. Wea. Rev. Wash., 63: 45-49 (1935). 
11. Mitcneny, C. L., ‘West Indian Hurricanes and Other 
Tropical Cyclones of the North Atlantic Ocean.’’ Mon. 
Wea. Rev. Wash., Supp. No. 24, 47 pp. (1924). 
12. Riwut, H., “On the Formation of West Atlantic Hurri- 
canes.’’ Dept. Meteor. Univ. Chicago, Misc. Rep., No. 24, 
64 pp. (1948). 
13. —— ‘On the Formation of Typhoons.” J. Meteor., 5: 247- 
264 (1948). 
14. —— and Suarer, R. J., ‘The Recurvature of Tropical 
Storms.” J. Meteor., 1: 42-54 (1944). 
15. Scuacur, E., ‘‘A Mean Hurricane Sounding for the Carib- 
bean Area.” Bull. Amer. meteor. Soc., 27: 324-827 (1946). 
16. Simpson, R. H., ‘‘On the Movement of Tropical Cyclones.” 
Trans. Amer. geophys. Un., 27: 641-655 (1946). 
17. Stevenson, T., ‘Observations on the Relation Between 
the Height of Waves and Their Distance from the Wind- 
ward Shore.’’ Hdinb. new phil. J., 53: 358-359 (1852). 
18. Tanneniuy, I. R., Hurricanes. Princeton, Princeton Uni- 
versity Press, 1938. : 
19. Vinus, B., Cyclonic Circulation and Translatory Movement 
of West Indian Hurricanes. U.S. Weather Bureau, Wash- 
ington, D. C., 1898. 
20. VisHER, S., Tropical Cyclones of the Pacific. Bernice P. 
Bishop Museum, Bull. 20, Honolulu, Hawaii, 1925. 
21. Wexier, H., “The Structure of the September 1944 Hur- 
ricane When off Cape Henry, Virginia.”’ Bull. Amer. 
meteor. Soc., 26: 156-159 (1945). 
22. —— “Structure of Hurricanes as Determined by Radar.”? 
Ann. N.Y. Acad. Sct., 48: 821-844 (1947). 
