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RISThe Life Cycle of a Thunderstorm in Three Dimensions
Publisher: American Meteorological Society
Abstract: The results of an isolated three-dimensional thunderstorm simulation are reported. An initial wind shear of 1.54 m sec?1 km?1 is specified in the x direction and symmetry is assumed in the y direction about the central x-z ...
On the Thermodynamic Equation for Deep Convection
Publisher: American Meteorological Society
Abstract: A review is given of six equations that are used to approximate reversible saturated parcel ascent. These approximations are compared with the aid of several examples and their appropriateness for use in modeling deep ...
The Pressure Perturbation and the Numerical Modeling of a Cloud
Publisher: American Meteorological Society
Abstract: The adaptation of the deep convection equations of Ogura and Phillips to moist convection results in an implicit relationship between temperature, potential temperature, pressure, and saturation vapor pressure. Typically, ...
Hodograph Curvature and Updraft Intensity in Numerically Modeled Supercells
Publisher: American Meteorological Society
Abstract: A set of numerical simulations of supercell thunderstorms has been carried out with a range of low-level curvatures in the environmental hodograph and midlevel shears. They cover a range of hodograph ?shape,? as measured ...
Simulation and Analysis of Tornado Development and Decay within a Three-Dimensional Supercell Thunderstorm
Publisher: American Meteorological Society
Abstract: A three-dimensional numerical simulation using a two-way interactive nested grid is to study tornado-genesis within a supercell. During a 40-minute period, two tornadoes grow and decay within the storm's mesocyclone. The ...
The Numerical Simulation of Non-Supercell Tornadogenesis. Part I: Initiation and Evolution of Pretornadic Misocyclone Circulations along a Dry Outflow Boundary
Publisher: American Meteorological Society
Abstract: High-resolution three-dimensional simulations are used to study misocyclone initiation and development along the leading edge of an outflow boundary. Model conditions were designed such that this development could be ...
The Numerical Simulation of Nonsupercell Tornadogenesis. Part III: Parameter Tests Investigating the Role of CAPE, Vortex Sheet Strength, and Boundary Layer Vertical Shear
Publisher: American Meteorological Society
Abstract: Nonsupercell tornadogenesis has been investigated in a three-part numerical study. Building on the results of Parts I and II, Part III addresses the sensitivity of nonsupercell tornadogenesis to variations in convective ...
A Three-Dimensional Numerical Simulation of Splitting Severe Storms on 3 April 1964
Publisher: American Meteorological Society
Abstract: A three-dimensional numerical storm model is used to investigate the observed splitting of several reflectivity echoes on 3 April 1964 in Oklahoma. Representative soundings from this day exhibit a nearly one-directional ...
A Simulation of the Development of Successive Cells Along a Cold Outflow Boundary
Publisher: American Meteorological Society
Abstract: A three-dimensional numerical simulation is presented in which five new cells (clouds) develop in succession over a 4 h period. The cells that develop have common characteristics including a lifetime of ?40 min. They form ...
The Dependence of Storm Longevity on the Pattern of Deep Convection Initiation in a Low-Shear Environment
Publisher: American Meteorological Society
Abstract: he sensitivity of storm longevity to the pattern of deep convection initiation (e.g., multiple, quasi-linearly arranged initial deep convective cells versus an isolated deep convective cell) is examined using idealized ...