Results 181 to 190 of about 11,493 (223)
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On the Generation of African Squall Lines
Journal of Climate, 1993Abstract Squall lines (SLs) form an important component of the meteorology of northern Africa, and in particular, contribute substantially to rainfall totals. Their generation requires the existence of a potentially unstable low-level supply of moisture overlain by dry desert air and vertical wind shear beneath the midlevel African easterly jet.
David P. Rowell, James R. Milford
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Extratropical Squall Lines and Rainbands
1986Squall lines and rainbands occur over both tropical and extratropical areas of the Earth in both oceanic and land areas. They affect society in major ways because of their wide geographical range and frequency of occurrence and because they typically contain high rainfall rates.
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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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Investigating extreme precipitation in tropical squall lines
2022<p>Squall lines are the consequence of the interaction of low-level shear with cold pools associated with convective downdrafts, and beyond a critical shear, squall lines tend to orient themselves. It has been shown that this orientation has the effect of reducing the incoming wind shear to the squall line and maintains equilibrium ...
Sophie Abramian +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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THE MERIDIONAL GROWTH OF SQUALL LINES
Journal of Meteorology, 1954Abstract 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, 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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ENTWICKLUNG VON SQUALL-LINES IM ALPENVORLAND
1999Seit 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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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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Tropical Squall Lines of the Arizona Monsoon
Monthly Weather Review, 1989Three 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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