Results 101 to 110 of about 444 (139)
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Monthly Weather Review, 2021
AbstractThe time preceding supercell tornadogenesis and tornadogenesis “failure” has been studied extensively to identify differing attributes related to tornado production or lack thereof. Studies from the Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX) found that air in the rear-flank downdraft (RFD) regions of non- and ...
Kristofer S. Tuftedal +3 more
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AbstractThe time preceding supercell tornadogenesis and tornadogenesis “failure” has been studied extensively to identify differing attributes related to tornado production or lack thereof. Studies from the Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX) found that air in the rear-flank downdraft (RFD) regions of non- and ...
Kristofer S. Tuftedal +3 more
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Vorticity Evolution Leading to Tornadogenesis and Tornadogenesis Failure in Simulated Supercells
Journals of the Atmospheric Sciences, 2014Abstract A three-dimensional idealized cloud model was used to study the storm-scale differences between simulated supercells that produce tornado-like vortices and those that do not. Each simulation was initialized with a different Rapid Update Cycle, version 2 (RUC-2), sounding that was associated with tornadic and nontornadic ...
Jason Naylor
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The Tornadogenesis Optimization Algorithm
2017 IEEE 16th International Conference on Cognitive Informatics & Cognitive Computing (ICCI*CC), 2017The Tornadogenesis Optimization Algorithm (TOA), a new air mass population based meta-heuristic optimization (MHO) algorithm is devised in this paper. Implementation of TOA has taken its root from the formation of tornadoes, particularly at Oklahoma State of United States.
Ravi Kumar Saidala, Nagaraju Devarakonda
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Quarterly Journal of the Royal Meteorological Society, 1978
AbstractIn this paper we use a simple numerical model to study vortex growth in a flow configuration which broadly simulates the principal characteristics of a severe tornadic storm system, i.e. strong vertical forcing by intense cumulus or cumulonimbus convection in the presence of an organized field of rotation on the cloud scale.
RK SMITH, LM LESLIE
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AbstractIn this paper we use a simple numerical model to study vortex growth in a flow configuration which broadly simulates the principal characteristics of a severe tornadic storm system, i.e. strong vertical forcing by intense cumulus or cumulonimbus convection in the presence of an organized field of rotation on the cloud scale.
RK SMITH, LM LESLIE
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Idealized Simulations of Aerosol Influences on Tornadogenesis [PDF]
Geophysical Research Letters, 2008 Numerical simulations of an idealized supercell thunderstorm were performed to assess effects of increased aerosol concentrations acting as cloud condensation nuclei (CCN) and giant CCN (GCCN) on tornadogenesis. Initial background profiles of CCN and GCCN concentrations were set to represent “clean” continental and aerosol‐polluted environments ...
David G. Lerach +2 more
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An Electric Force Facilitator in Descending Vortex Tornadogenesis [PDF]
Journal of Geophysical Research D: Atmospheres, 2008 We present a novel explanation of the physical processes behind one type of cloud and ground‐level tornadogenesis within a supercell. We point out that the charge separation naturally found in these large thunderstorms can potentially serve to contract the preexisting angular momentum through the additional process of the electric force.
Sharon L Sessions, Gregory D Bothun
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Geophysical Research Letters, 2009 On the afternoon of 18 January 2003, wildfires swept through several outer suburbs of Canberra (Australia) producing, inter alia, a series of large pyro-cumulonimbus cells and at least one tornado.
Michael John Reeder, Philip Cunningham
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The Effect of Vertical Stability on Tornadogenesis
Journal of the Atmospheric Sciences, 1978Abstract A recent numerical study of vortex growth in a flow configuration which models the principal characteristics of a tornado cyclone (Smith and Leslie, 1978) is extended to take account of vertical stability. It is shown that for a given strength of convection and rotation (in the model, the driving effect of a ‘supercell’ updraft is simulated by
L. M. Leslie, R. K. Smith
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An Australian pyro-tornadogenesis event
Natural Hazards, 2012On 18 January 2003, fires had a devastating impact on Australia’s capital, Canberra. A series of reviews and scientific studies have examined the events of that day and indicate that the worst impacts were due to a series of violent pyro-convective events and resultant pyro-cumulonmibi.
Richard H. D. McRae +3 more
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A numerical study of tornadogenesis in a rotating thunderstorm
Quarterly Journal of the Royal Meteorological Society, 1979AbstractThe structure and dynamics of tornadoes and the mechanisms leading to their formation are explored in the context of an axi‐symmetric numerical model of a tornado cyclone. The paper extends a recent study of tornadogenesis by the authors to include explicit representation of moisture effects.The calculations show that the distribution of ...
R. K. Smith, L. M. Leslie
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