THE METHOD OF CHARACTERISTICS 
study of flow under an inversion. It is sincerely hoped 
that all meteorologists will keep this method in mind as 
a possible means of obtaining quantitative results in 
a problem. 
REFERENCES 
1. ABpuuiAn, A. J., ‘““Cyclogenesis by a Purely Mechanical 
Process.’’ J. Meteor., 6:86-97 (1949). 
2. Auprrt, L., ‘(Notes on the Weather and Climate of Sey- 
mour Island, Galapagos Archipelago.’”’ Bull. Amer. me- 
teor. Soc., 27:200-209 (1946). 
3. BercGREN, R., Bourn, B., and Rosssy, C.-G., ‘‘An Aero- 
logical Study of Zonal Motion, Its Perturbations and 
Break-Down.”’ Tellus, Vol. 1, No. 2, pp. 14-87 (1949). 
4. Brunk, I. W., ‘“‘The Pressure Pulsation of 11 April 1944.” 
J. Meteor., 6:181-187 (1949). 
5. Courant, R., and Frirpricus, K. O., Supersonic Flow 
and Shock Waves. New York, Interscience, 1948. 
6. Crocker, A. M., Gopson, W. L., and Penner, C. M., 
“Frontal Contour Charts.” J. Meteor., 4:95-99 (1947). 
7. Freeman, J. C., “An Analogy between the Equatorial 
Easterlies and Supersonic Gas Flows.”’ J. Meteor., 
§:138-146 (1948). 
8. —— “Reply: The Usefulness of Incompressible Models.” 
J. Meteor., 6:287 (1949). 
9. —— ‘Map Analysis in the Vicinity of a Pressure Jump.”’ 
Bull. Amer. meteor. Soc., 31:324-325 (1950). 
10. —— “The Wind Field of the Equatorial East Pacific as a 
Prandtl-Meyer Expansion.” Bull. Amer. meteor. Soc., 
31 :303-304 (1950). 
11. Harrison, H. T., and Orenporrr, W. K., “‘Pre-cold- 
12. 
frontal Squall Lines.”’ United Air Lines Meteor. Dept. 
Cire. No. 16 (1941). 
IsenBerG, J. S., The Method of Characteristics in Com- 
13. 
14. 
15. 
25. 
. Wixuuiams, N. 
433 
pressible Flow, Part I. Tech. Rep. No. F-TR-1173A-ND, 
Hdqtrs. Air Materiel Command, Wright Field, Dayton, 
Ohio, 1947. 
Maynarp, R. H., ‘‘Radar and Weather.” J. Meteor., 
2:214-226 (1945). 
McGurrin, M., The Principle of Open Channel Flow Ap- 
plied to the Formation of Tornadoes. Unpublished, avail- 
able at the Library of the U. 8. Weather Bureau, Wash- 
ington, D. C., 1942. 
Ricuarpson, L. F., Weather Prediction by Nwmerical 
Process. Cambridge, University Press, 1922. 
. Rosspy, C.-G., ‘On the Propagation of Frequencies and 
Energy in Certain Types of Oceanic and Atmospheric 
Waves.’ J. Meteor., 2:187—204 (1945). 
. — “On the Dynamics of Certain Types of Blocking 
Waves.”’ J. Chinese geophys. Soc., 2:1-13 (1950). 
. SHERMAN, L., ‘“‘The Neglect of Compressibility in the 
Flow of Gas at Low Speeds.” J. Meteor., 6 :286-287 (1949). 
. Tepper, M., ‘“‘A Proposed Mechanism of Squall Lines— 
The Pressure Jump Line.” J. Meteor., 7:21-29 (1950). 
. —— “On the Origin of Tornadoes.’”’ Bull. Amer. meteor. 
Soc., 31:311-314 (1950). 
. —— and Frerman, J. C., ‘Analogy between Equatorial 
[Easterlies] and Supersonic Flows.” J. Meteor., 6:226 
(1949). 
. U. 8S. WeatuEer Bureau, Atlas of Climatic Charts of the 
Oceans. W. B. Publ. No. 1247, Washington, D. C., 1938. 
. Wini1ams, D. T., “A Surface Micro-Study of Squall- 
Line Thunderstorms.” Mon. Wea. Rev. Wash., 76:239- 
246 (1948). 
R., ‘Development of Dust Whirls and 
Similar Small-Scale Vortices.’”’ Bull. Amer. meteor. Soc., 
29 106-117 (1948). 
Wexter, H., ‘Structure of Hurricanes as Determined by 
Radar.”? Ann. N. Y. Acad. Sci., 48:821-844 (1947). 
