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Showing 1 to 20 of 64 for “"supercell"”.
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Entrainment in simulated supercell thunderstorms
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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The numerical simulation of non-supercell tornadogenesis
Non-supercell tornado is a name given to a class of tornadoes which occur with deep moist convection not displaying the strong mid-level rotation found in supercell thunderstorms. In recent years the severe storms community has acknowledged that a significant portion of the small tornadoes …
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Low-level curvature shear and supercell thunderstorm behavior
Tornadoes pose threats to lives and property, and accurately issuing warnings of their occurrence represents a challenge to operational meteorologists. One tool that will become increasingly important in responding to this challenge is Doppler radar which is used to detect rotation over several …
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Effects of environmental shear and buoyancy on simulated supercell interactions
… Using an idealized numerical model, 240 supercell interactions are simulated under systematically varied amounts of buoyancy and vertical wind shear. Small changes in buoyancy or vertical wind shear have signi cant impacts on post-interaction storm morphology. A wide amount of variation …
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Assessing the impacts of microphysical and environmental controls on simulated supercell storms
Supercell thunderstorms are some of the most dangerous single-cell storms on the planet. These storms produce many hazards to life and property, including tornadoes, floods, damaging straightline winds, strong updrafts and downdrafts, and lightning. Although these hazards are not unique to …
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Effects of Microphysical Parameterizations and Drop Breakup on Supercells and Supercell Cold Pools.
… microphysical parameterizations affect the supercell cold pool and the evolution of storm structure. Using in-situ data gathered by StickNet probes, the simulated cold pool can be objectively verified against the observations. This verification is done over the entire supercell and over the …
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The effects of entrainment in the developing and rotating stages of supercell thunderstorms
… rotating updrafts in some thunderstorms (i.e. supercells; produced in environments with specific characteristics of the vertical wind shear) might alter the amount of entrainment they experience. In the current study, idealized, 3D, high-resolution numerical simulations of supercell …
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The Role of Topography on the 7 June 2012 Tornadic Supercell near Wheatland, WY
… study of an EF2 tornado that occurred with a supercell thunderstorm on June 7th, 2012 near Wheatland, WY. It is hypothesized that the topography of the Rocky Mountains played a role in this storm’s formation, based on another study that showed that the mountains created low-level flow …
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Controls of updraft size, cold pool characteristics, and potential tornado intensity in supercell thunderstorms
… parameterization schemes. Here, the structure of supercell updraft width and its connection to attendant cold pool characteristics are examined using idealized simulations. This study finds that, within a supercell storm mode, updraft width is strongly dependent on environmental vertical wind …
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Internal vs. External Forcings in Supercell Interactions and Their Impact on Storm Morphology and Intensity
This study examines supercell interactions from a suite of fifty-two idealized numerical simulations. The relative positions of two storm cells are varied for each case, and a single-cell simulation serves as the control. Despite initializing each simulation with an identical convective available …
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A Case Study of a High-Precipitation Supercell-Bow Echo Transition on 4-5 June 2008
… make measurements from a high-precipitation (HP) supercell-bow echo (SBE) transition during Project MOBILE. Prior to crossing the StickNet array, this HP supercell interacted and merged with a nascent supercell before transitioning into a bow echo (BE). Surface kinematic and thermodynamic …
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Impact Of Choices When Creating Average Proximity Soundings As Applied To Lp/cl/hp Supercell Environments
… This exploration was applied to three groups of supercell proximity soundings: low-precipitation (LP), classic (CL), and high precipitation (HP) and the HA analysis from the Rasmusssen and Straka (RS98) paper are reanalyzed in both the FA and HA framework. The second half of this study …
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Terrain and Landcover Effects of the Southern Appalachian Mountains on the Low-Level Rotational Wind Fields of Supercell Thunderstorms
… for smaller-scale severe weather phenomena like supercells and tornadoes. This study examines how complex terrain may have influenced the rotational low-level wind fields of fourteen supercell thunderstorms in the Appalachians. The terrain variables include elevation, land cover, slope, and …
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The Utility of Total Lightning in Diagnosing Single-cell Thunderstorm Severity in the Central Appalachian Mountains Region
… classified as either single-cell or multicell/supercell storm modes. The classification of storms was determined using a storm index (SI) which was informed by current National Weather Service (NWS) identification techniques. The 36 days meeting the minimum threshold of lightning activity were …
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Clustered-dot periodic halftone screen design and ICC profile color table compression
… limitation, the microcells can be grouped into supercells. The challenge is then to determine the desired supercell shape and the order in which dots are added to the microcell. Using DBS to determine this order results in a very homogeneous halftone pattern. To simplify the design and …
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How does terrain influence the upscale convective growth of orographic deep moist convection?
… process. This case featured an orographic supercell that transitioned into a bowing mesoscale convective system over three-to-four hours. The simulation revealed enhanced low-level vertical wind shear along the eastern slopes of the Sierras de Córdoba that aided in the formation of a left …
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Characterizing and Forecasting Severe Convective Storms using Deep Learning
… the dynamics and predictability of tornadic supercell environments, leveraging advanced data analysis and machine learning techniques. Initial research established a foundation by examining the spatial and temporal variability of tornado-favorable parameters using reanalysis data. This work …
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Dilute nitride semiconductors : band structure, scattering and high field transport
… and mobility of dilute nitride alloys. In the supercell model we solve the single particle Hamiltonian for a very large supercell containing randomly placed nitrogen. This model predicts a gap in the density of states of GaNxAs1−x, where this gap is filled in the Green’s function model. …
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Tornadogenesis And Tornadogenesis Failure In Numerically Simulated Supercells
… failure. The simulations were initialized with supercell proximity soundings taken from the Rapid Update Cycle (RUC) model. Because of the large number of simulations performed, several objective techniques were developed and tested to assist in the simulations--including automated supercell and …
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Insights into tornadogenesis and tornado dynamics from idealized simulations
… by recent studies which suggest that all supercells have vertical vorticity maxima which could be intensified to tornado strength, but that the presence of a robust and strong low-level mesocyclone is the critical factor deciding about tornadogenesis success. To test this conclusion, the …
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