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V. K. Saxena, J. N. Burford, and J. L. Kassner Jr.

subsaturations havebeen produced by Kocmond and Jiusto in a hazechamber which is essentially a modified thermal, diffusion chamber. Accompanying the increasing popularity of the thermal diffusion chamber as an important tool in cloudphysics, some improvements (Gagin and Terliuc, 1968)and modifications have been suggested in its designand operation from time to time. Storozhilova (1961)was the first to suggest a continuous flow thermaldiffusion chamber which ingeniously operates on adilution technique of

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Philip Duncan Thompson

JUNE 1956PHILIP D. THOMPSON251A THEORY OF LARGE-SCALE DISTURBANCES IN NON-GEOSTROPHIC FLOWBy Maj. Philip Duncan Thompson, U.S.A.F. Joint Numerical Weather Prediction Unit* (Manuscript received 11 April 1955)ABSTRACTThe primary aim of this article is to derive a complete system of modified hydrodynamical equationswhich govern a large class of "meteorological" motions of the atmosphere, but which cannot generatesolutions corresponding to sound and gravity waves. The latter have no

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Ulrike Wacker, Thomas Frisius, and Fritz Herbert

has come up again recently, mostly in connection with the design and development of a new generation of simulation models for the purpose of climate research and numerical weather prediction (NWP). Examples are presented by Satoh (2003) for a Japanese cloud ensemble model, Saito (1998) for the Japanese mesoscale NWP model, Ooyama (2001) and Bannon (2002) for models of moist convection, and L. Bonaventura et al. (2003, personal communication) for the design of the new German Icosahedral

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M. Segal, R. W. Arritt, and J. E. Tillman

analogous to outbreaks of continental cold air over Earth’s relatively warm oceans. The heat storage of the oceanic surface layer is almost unaffected by the outbreak; thus the water surface temperature is only mildly modified in most cases. Consequently, the enhanced H s values during such events result in significant modification of the cold air mass thermal characteristics within a relatively short period (e.g., Garratt 1992 ). Projecting from the Earth marine case, it is likely that analogous

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A. Lapidus and U. Shafrir

laboratory observations of ice crystal growth from the vapor. J. Atmos. Sci., 22, 64-69.Hindman, E. E., II, 1968a: Numerical simulation of supercooled fog dispersal. Preprints First Natl. Conf. Weather Modification, 28 April-1 May 1968, Amer. Meteor. Soc., 396403. , 1968b: Yellowstone Field Research Expedition VIII. Navy Weather Research Facility Tech. Paper No. 6-68, 12 pp. , and D. B. Johnson, 1970: Numerical simulation of ice hydrometeor development. Preprints Conf. Cloud Physics, 24

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M. M. Miglietta and R. Rotunno

, but it is such a large effect that it can render the atmosphere statically neutral or unstable locally even if it were stable to unsaturated displacements. In trying to understand the orographic-flow modification for an initially saturated flow, it is not possible to know a priori where the air will be saturated since the absence or presence of saturated regions depends on the flow itself, which is what one is trying to predict. Barcilon et al. (1979) carried out an analytical calculation of

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S. Twomey

reported forexample by Robinson (1958) and by Drummond andHickey (1971). The latter inferred cloud absorption of25-30% for thick clouds in the ROMEX area whereparticle layer absorption was measured at around 5%.REFERENCESDrummond, A. J., and J. R. Hickey, 1971: Large-scale reflection and absorption of solar radiation by clouds as influencing earth radiation budgets: New aircraft measurements. prints of Papers, Intern Conf. Weather Modification, Canberra, Australia Acad. Sci. and Amer. Meteor. Soc

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R. A. Maddox, D. J. Perkey, and J. M. Fritsch

1664 JOURNAL OF THE ATMOSPHERIC SCIENCES VOLUME3gEvolution of Upper Tropospheric Features during theDevelopment of a Mesoscale Convective Complex~ R. A. MADDOXNOAA, Environmental Research Laboratories, Office of Weather Research and Modification, Boulder, CO 80303 D. J. PERKEY:National Center for Atmospheric Research? Boulder, CO 80307 J. M

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L. Mahrt and Soon-Ung Park

derivative of the streamfunction tendency in the potential vorticity equationof each coordinate system. This stability parameter must be assumed constant for convenientanalytical treatment. The stability parametersresulting from developments in pressure coordinates,(Oek/Op)(O lnO/Op) [e.g., Haltiner, 1971, p. 154], inlog-pressure coordinates, .~ T~ (0 lnO/ Oz) [e.g., Phillips,1963-], and in isentropic coordinates, g(O lnO/Oz), areestimated from January radiosonde data averaged over10 years (U. S. Weather

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R. F. Griffiths and B. Vonnegut

. KEEFERDept. of Engineering Sciences, University of Florida, Gainesville 32611 (Manuscript received I July 1974, in revised form 2 August 1974)ABSTRACT Atmospheric pressure, temperature and wind speed were measured at the ground in Chinguetti, Mauritania, during the 1973 solar eclipse. The pressure measurements were intended to determine if barometricpressure changes were caused by the eclipse, but they produced a null result because of local weather conditions. Eclipse-induced temperature changes were

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