A Numerical Investigation of Severe Thunderstorm Gust Fronts PDF Download
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Author: Kenneth E. Mitchell
Publisher:
ISBN:
Category : Fronts (Meteorology)
Languages : en
Pages : 124
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Book Description
Author: Kenneth E. Mitchell
Publisher:
ISBN:
Category : Fronts (Meteorology)
Languages : en
Pages : 124
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Book Description
Author: Keith L. Seitter
Publisher:
ISBN:
Category : Atmospheric turbulence
Languages : en
Pages : 34
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Book Description
The thunderstorm gust front is an important feature for both the maintenance and initiation of storms. Previous studies have shown that the thunderstorm outflow producing the gust front can be treated as an atmospheric density current to a good approximation. In this study, a new version of the density current speed equation, based on the surface pressure rise, is derived. This equation is shown to give much better results than other commonly used forms when applied to twenty previously reported gust front observations. A two-dimensional numerical model is used to investigate the dynamics of atmospheric density currents. Simulations with this model show the effects of the environmental wind relative to the storm and the wind shear on the propagation of the gust front and the depth of the thunderstorm outflow. The results of these simulations are discussed in terms of the conditions necessary for the gust front to remain in a position that is beneficial for the maintenance of the storm. Moist processes are included in the model and simulations are made to investigate atmospheric density current propagation through a moist atmosphere. The lifting that occurs during gust front passage is calculated and it is found that even when this lifting is sufficient to bring moist parcels above their level of free convection; deep convection is prohibited by other aspects of the circulation. The generation of an arc cloud by the gust front is found to result in a less intense and slower gust front compared to an outflow that did not produce an arc cloud. This result is interpreted in terms of the gust front speed equation based on the surface pressure rise. (Author).
Author: Keith L. Seitter
Publisher:
ISBN:
Category : Atmospheric turbulence
Languages : en
Pages : 40
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Book Description
The thunderstorm gust front is an important feature for both the maintenance and initiation of storms. Previous studies have shown that the thunderstorm outflow producing the gust front can be treated as an atmospheric density current to a good approximation. In this study, a new version of the density current speed equation, based on the surface pressure rise, is derived. This equation is shown to give much better results than other commonly used forms when applied to twenty previously reported gust front observations. A two-dimensional numerical model is used to investigate the dynamics of atmospheric density currents. Simulations with this model show the effects of the environmental wind relative to the storm and the wind shear on the propagation of the gust front and the depth of the thunderstorm outflow. The results of these simulations are discussed in terms of the conditions necessary for the gust front to remain in a position that is beneficial for the maintenance of the storm. Moist processes are included in the model and simulations are made to investigate atmospheric density current propagation through a moist atmosphere. The lifting that occurs during gust front passage is calculated and it is found that even when this lifting is sufficient to bring moist parcels above their level of free convection; deep convection is prohibited by other aspects of the circulation. The generation of an arc cloud by the gust front is found to result in a less intense and slower gust front compared to an outflow that did not produce an arc cloud. This result is interpreted in terms of the gust front speed equation based on the surface pressure rise.
Author: A. J. Bedard
Publisher:
ISBN:
Category : Fronts (Meteorology)
Languages : en
Pages : 28
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: United States. National Oceanic and Atmospheric Administration
Publisher:
ISBN:
Category : Radar meteorology
Languages : en
Pages : 252
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Book Description
Author: Kenneth Earl Wilk
Publisher:
ISBN:
Category : Thunderstorms
Languages : en
Pages : 196
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Book Description
The scales of severe thunderstorm phenomena in the Midwest are described and the time and space resolution of observational data used in the investigation of severe local storms in Illinois is discussed. A detailed analysis of radar, TIROS I, and synoptic data acquired for the specific storm of 16 May 1960 shows the complete storm system contains several distinct thunderstorm complexes. Radar echo composites, which were constructed for 4 standard pressure levels for this storm system, disclosed that only one or two major thunderstorms within a complex were responsible for the observed severe weather. (Author).
Author: United States. Federal Aviation Administration. Systems Research and Development Service
Publisher:
ISBN:
Category : Thunderstorms
Languages : en
Pages : 122
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Book Description
Author: Alexander Baklanov
Publisher: Springer Science & Business Media
ISBN: 0387743219
Category : Science
Languages : en
Pages : 239
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Book Description
This volume presents peer-reviewed papers from the NATO Advanced Research Workshop on Atmospheric Boundary Layers held in April 2006. The papers are divided into thematic sessions: nature and theory of turbulent boundary layers; boundary-layer flows: modeling and applications to environmental security; nature, theory and modeling of boundary-layer flows; air flows within and above urban and other complex canopies: air-sea-ice interaction.
Author:
Publisher:
ISBN:
Category : Meteorology
Languages : en
Pages : 1164
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Book Description
