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A PROPOSED MECHANISM OF SQUALL LINES: THE PRESSURE JUMP LINE
Journal of Meteorology, 1950Abstract The squall line of 16 May 1948 in the area of the Cloud Physics Project, U. S. Weather Bureau micro-meteorological network of weather recording stations near Wilmington, Ohio, is analyzed by means of one-minute synoptic maps, x–t diagrams and isochrone maps. The relative behavior of the pressure jump, wind shift, temperature fall, maximum wind
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Generation and propagation of African squall lines
Quarterly Journal of the Royal Meteorological Society, 1984AbstractA study of squall lines affecting Minna, Nigeria during 1974–1976 emphasizes two particular aspects of their dynamics: that a strong jet around 650 mb is essential for their development, and that the forward edge of the squall line moves slightly faster than the maximum jet speed.
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Structure and motion of tropical squall‐lines over Venezuela
Quarterly Journal of the Royal Meteorological Society, 1976AbstractThe 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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Effective Buoyancy in Squall Lines
Journal of the Atmospheric SciencesAbstract 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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Mesoscale Structure of an Oklahoma Squall Line
Monthly Weather Review, 1981Abstract A squall line, which passed through the National Severe Storms Laboratory measonetwork in Oklahoma on 26 April 1969, is analyzed to determine the mesoscale structure. The analyses are based on data from 23 rawinsonde ascents, 29 automatically recording surface stations, and radar PPI coverage.
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Initiation of West African squall lines
Meteorology and Atmospheric Physics, 1989It is proposed that squall lines are initiated through the growth (with time) of wave-like perturbations along the surface of discontinuity between the monsoon southwesterlies and the dry northeasterlies in West Africa. Out of the many possible modes of different growth rates, the modes with the largest amplification could block the 650-mb mid ...
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Organization of deep convection into squall lines
The organization of deep convection into squall lines is not represented in global climate models, despite being among the biggest storms on Earth and having a huge impact on precipitation and extremes in tropical regions such as the Sahel or the Amazon [1, 2].Malek Segueni +2 more
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A Wave-CISK Model of Squall Lines
Journal of the Atmospheric Sciences, 1984Abstract The wave-CISK model of Raymond incorporating lag effects in the updraft and downdraft is implemented as an initial value problem in physical space. Examples of both midlatitude and tropical squall lines are successfully simulated. Diagnosis of the model shows that condensational heating in the updraft is the primary driving mechanism of a ...
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The Squall Line Thunderstorm: Numerical Experimentation
Journal of the Atmospheric Sciences, 1973Abstract 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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