Results 181 to 190 of about 13,520 (224)

The Squall Line Thunderstorm: Numerical Experimentation

Journal of the Atmospheric Sciences, 1973
Abstract The structure and mechanism for maintenance of the Great Plains squall line thunderstorm are studied through formulation of a two-dimensional, time-dependent numerical model. The environmental conditions known to be favorable for squall line development and maintenance include a convectively unstable air mass whose motion is characterized by ...
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THE MERIDIONAL GROWTH OF SQUALL LINES

Journal of Meteorology, 1954
Abstract Squall lines that form ahead of an accelerating cold front are sometimes observed to grow in length. In this paper an attempt is made to explain this interesting property of squall lines, and to deduce a mathematical formula by which this growth may be forecasted.
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Structure and motion of tropical squall‐lines over Venezuela

Quarterly Journal of the Royal Meteorological Society, 1976
AbstractThe characteristics of squall‐lines observed during the second Venezuelan International Meteorological and Hydrological Experiment (VIMHEX‐1972) are compared with the predictions of Moncrieff and Miller (1976). These squall‐lines are highly organized, propagate in a distinctive fashion, and effect a significant modification on both the ...
AK BETTS, RW GROVER, MW MONCRIEFF
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ENTWICKLUNG VON SQUALL-LINES IM ALPENVORLAND

1999
Seit über zehn Jahre werden im Alpenvorland sowohl in Deutschland als auch in der Schweiz Experimente durchgeführt, um die Entstehung von Gewittern und Squall-lines zu untersuchen und zu verstehen. Die aus den Experimenten erfaßten Daten wurden dazu verwendet, konvektive Systeme anhand von synoptischen Bodenanalysen zu erfassen.
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Potential Vorticity Anomalies Associated with Squall Lines

Monthly Weather Review, 1991
Abstract This study involves observations and model simulations of potential vorticity anomalies in the wake of midlatitude squall lines. Using data from the Oklahoma–Kansas PRE-STORM experiment, we analyze potential vorticity fields near two squall lines—one with and one without a trailing stratiform region. From this observational analysis we suggest
Rolf F. A. Hertenstein, Wayne H. Schubert   +1 more
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Mesoscale Observations of a Prefrontal Squall Line

Monthly Weather Review, 1985
Abstract Phase I of the Cold Fronts Research Programme was carried out during November/December 1980 in south-eastern Australia. Data from a frontal event on 27 November are analyzed, with particular emphasis on a squall line that formed over the Southern Ocean and moved across the predominantly land-based network. Potential instability between 750 and
W. L. Physick, W. K. Downey, A. J. Troup, B. F. Ryan, P. J. Meighen   +4 more
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Tropical Squall Lines of the Arizona Monsoon

Monthly Weather Review, 1989
Three cases of squall lines composed of strong to severe thunderstorms that formed over Arizona, and Sonora (Mexico) on July, 16-17 and 17-18, 1984, and August 2-3, 1986, are examined. Data, which included satellite imagery, VISSR-derived fields, surface data, and records or cloud-to-ground lightning strikes, indicate that the initiation, growth, and ...
Walter P. Smith, Robert L. Gall
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The two-dimensional dynamics of West African squall lines

Quarterly Journal of the Royal Meteorological Society, 1987
AbstractThe two‐dimensional dynamics of multicell and unicell squall lines are examined using a numerical model. Both types feature a convective jump updraught with extensive, deep, rearward‐extending anvils. the multicell case contains travelling convection cells and is unsteady but persistent, whereas the unicell case is quasi‐steady.In the multicell
J. Dudhia, M. W. Moncrieff, D. W. K. So
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Effective Buoyancy in Squall Lines

Journal of the Atmospheric Sciences
Abstract Squall lines consist of a buoyancy discontinuity with positive buoyancy extending hundreds of kilometers behind their leading edge. Because of this structure, conceptual models for isolated deep convective updrafts, which have a comparatively limited horizontal extent, fail to explain squall-line thermodynamics.
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A NUMERICAL EXPERIMENT OF SQUALL-LINE FORMATION

Journal of Meteorology, 1959
Abstract The formation of a prefrontal squall line is studied, based on a numerical method of solving the modified equation of motion, continuity (mass and moisture content), and thermodynamics simultaneously. Due to the limited capacity of the electronic computer used (IBM 650), computations in this experiment are necessarily simplified, and this ...
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