Thunderstorm Downdraft and Gust Front Structure as Revealed by a Numerical Simulation PDF Download
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Author: Eric Dale Skyllingstad
Publisher:
ISBN:
Category : Thunderstorms
Languages : en
Pages : 194
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Book Description
Author: Eric Dale Skyllingstad
Publisher:
ISBN:
Category : Thunderstorms
Languages : en
Pages : 194
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Book Description
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:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: United States. Weather Bureau
Publisher:
ISBN:
Category : Thunderstorms
Languages : en
Pages : 308
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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: R. C. Goff
Publisher:
ISBN:
Category : Aircraft
Languages : en
Pages : 142
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Book Description
Strong wind changes and turbulence encountered by aircraft arriving or departing an airport constitute hazards to safe flight. Most serious encounters are thunderstorm outflow related. The gust front structure as observed by Doppler radar, standard weather radar, a 461 m meteorologically instrumented tower, aircraft and other observations is presented. Gust front evolution as observed with a severe thunderstorm is shown. Turbulence and multiple surges are discussed. (Author).
Author: James Pollard Espy
Publisher:
ISBN:
Category : Storms
Languages : en
Pages : 620
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Book Description
Author: William R. Cotton
Publisher: Academic Press
ISBN: 0080916651
Category : Science
Languages : en
Pages : 826
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Book Description
Storm and Cloud Dynamics focuses on the dynamics of clouds and of precipitating mesoscale meteorological systems. Clouds and precipitating mesoscale systems represent some of the most important and scientifically exciting weather systems in the world. These are the systems that produce torrential rains, severe winds including downburst and tornadoes, hail, thunder and lightning, and major snow storms. Forecasting such storms represents a major challenge since they are too small to be adequately resolved by conventional observing networks and numerical prediction models. - Provides a complete treatment of clouds integrating the analysis of air motions with cloud structure, microphysics, and precipitation mechanics - Describes and explains the basic types of clouds and cloud systems that occur in the atmosphere-fog, stratus, stratocumulus, altocumulus, altostratus, cirrus, thunderstorms, tornadoes, waterspouts, orographically induced clouds, mesoscale convection complexes, hurricanes, fronts, and extratropical cyclones - Summarizes the fundamentals, both observational and theoretical, of atmospheric dynamics, thermodynamics, cloud microphysics, and radar meteorology, allowing each type of cloud to be examined in depth - Integrates the latest field observations, numerical model simulations, and theory - Supplies a theoretical treatment suitable for the advanced undergraduate or graduate level, as well as post-graduate
Author: L. Bengtsson
Publisher: Springer Science & Business Media
ISBN: 3642818668
Category : Science
Languages : en
Pages : 325
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Book Description
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
