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RISMoist Convection at a Surface Cold Front
Publisher: American Meteorological Society
Abstract: The motion of a surface cold front in an environment that is unstable to moist convection is studied with the aid ofboth hydrostatic and nonhydrostatic two-dimensional models. Simulations with the hydrostatic model essentially ...
Trapping of Low-Level Internal Gravity Waves
Publisher: American Meteorological Society
Abstract: The characteristics of internal gravity waves propagating on a layer of high stratification near the ground with a deeper, weakly stratified layer above are examined with the aid of a nonhydrostatic numerical model. ...
Sensitivity of Moist Convection Forced by Boundary Layer Processes to Low-Level Thermodynamic Fields
Publisher: American Meteorological Society
Abstract: The sensitivity of moist convection to a number of low-level thermodynamic parameters is examined with a high-resolution, nonhydrostatic numerical model. The parameters examined are the surface temperature dropoff (defined ...
Understanding Hector: The Dynamics of Island Thunderstorms
Publisher: American Meteorological Society
Abstract: Linear and nonlinear models are used to examine the development of island thunderstorms, in particular the Hector convective system that forms over the Tiwi Islands just north of Australia. The linear model is used to ...
The Effect of Ambient Stratification and Moisture on the Motion of Atmospheric Undular Bores
Publisher: American Meteorological Society
Abstract: A numerical model is used to examine the effects of ambient stratification on the behavior of an atmospheric undular bore. It is shown that stratification reduces the amplitude of the disturbance at low levels by allowing ...
Dynamical and Microphysical Retrieval from Doppler Radar Observations Using a Cloud Model and Its Adjoint. Part I: Model Development and Simulated Data Experiments
Publisher: American Meteorological Society
Abstract: The purpose of the research reported in this paper is to develop a variational data analysis system that can be used to assimilate data from one or more Doppler radars. In the first part of this two-part study, the technique ...
Dynamical and Microphysical Retrieval from Doppler Radar Observations Using a Cloud Model and Its Adjoint. Part II: Retrieval Experiments of an Observed Florida Convective Storm
Publisher: American Meteorological Society
Abstract: The variational Doppler radar analysis system developed in part I of this study is tested on a Florida airmass storm observed during the Convection and Precipitation/ Electrification Experiment. The 3D wind, temperature, ...
Real-Time Low-Level Wind and Temperature Analysis Using Single WSR-88D Data
Publisher: American Meteorological Society
Abstract: A four-dimensional variational Doppler radar analysis system (VDRAS) has been developed and implemented at a weather forecast office to produce real-time boundary layer wind and temperature analyses using WSR-88D radar ...
Comparison of Thermodynamic Retrieval by the Adjoint Method with the Traditional Retrieval Method
Publisher: American Meteorological Society
Abstract: The adjoint technique for retrieval of the thermodynamic fields is compared with the traditional technique of Gal-Chen and Hane. The comparison is performed using both Doppler radar observations and simulated data. The ...
Assimilating Radar, Surface, and Profiler Data for the Sydney 2000 Forecast Demonstration Project
Publisher: American Meteorological Society
Abstract: A variational scheme for the analysis of low-level wind data is presented, and its performance during a recent field experiment is described. The analysis scheme finds an optimal fit to the data and a background field under ...