Results 141 to 150 of about 402 (177)
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Mesoscale Observations of a Prefrontal Squall Line
Monthly Weather Review, 1985Abstract 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 +4 more
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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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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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Mesoscale study of a squall line system
1985This item was digitized as part of a project to share McGill's intellectual legacy with the public. If you are the copyright holder or a relative of the copyright holder who is deceased, you may request withdrawal by emailing escholarship.library@mcgill.ca.
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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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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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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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STRUCTURE AND MECHANISM OF THE PREFRONTAL SQUALL LINE
Journal of Meteorology, 1950Abstract Using upper-air soundings taken by the Thunderstorm Project and surface and serological data available through teletype distribution, a detailed three-dimensional analysis of a prefrontal squall line is presented and certain new observational features of squall-line structure are shown. It is shown that squall-line thunderstorms appear in some
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