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RISA Modeling Study of Nonstationary Trapped Mountain Lee Waves. Part I: Mean-Flow Variability
Publisher: American Meteorological Society
Abstract: The impact of mean-flow variability on finite-amplitude trapped mountain lee waves is investigated by conducting two-dimensional mountain wave simulations for a set of idealized, time-dependent background flows. The lee-wave ...
A Modeling Study of Nonstationary Trapped Mountain Lee Waves. Part II: Nonlinearity
Publisher: American Meteorological Society
Abstract: The generation of nonstationary trapped mountain lee waves through nonlinear wave dynamics without any concomitant change in the background flow is investigated by conducting two-dimensional mountain wave simulations. These ...
Evaluating the Use of a Nonlinear Two-Dimensional Model in Downslope Windstorm Forecasts
Publisher: American Meteorological Society
Abstract: Severe downslope windstorms are a mesoscale, primarily wintertime, phenomenon that affect regions in the lee of large mountain ranges. The resolution of current weather prediction models is too coarse to explicitly predict ...
A Comparison of the Accuracy of Three Anelastic Systems and the Pseudo-Incompressible System
Publisher: American Meteorological Society
Abstract: The accuracy of three anelastic systems (Ogura and Phillips; Wilhelmson and Ogura; Lipps and Hemler) and the pseudo-incompressible system is investigated for small-amplitude and finite-amplitude disturbances. Based on ...
Observations of Precipitation Size and Fall Speed Characteristics within Coexisting Rain and Wet Snow
Publisher: American Meteorological Society
Abstract: Ground-based measurements of particle size and fall speed distributions using a Particle Size and Velocity (PARSIVEL) disdrometer are compared among samples obtained in mixed precipitation (rain and wet snow) and rain in ...
Beyond the Basics: Evaluating Model-Based Precipitation Forecasts Using Traditional, Spatial, and Object-Based Methods
Publisher: American Meteorological Society
Abstract: hile traditional verification methods are commonly used to assess numerical model quantitative precipitation forecasts (QPFs) using a grid-to-grid approach, they generally offer little diagnostic information or reasoning ...
Observations of Nonclassical Frontal Propagation and Frontally Forced Gravity Waves Adjacent to Steep Topography
Publisher: American Meteorological Society
Abstract: Through the integrated analysis of remote sensing and in situ data taken along the Front Range of Colorado, this study describes the interactions that occurred between a leeside arctic front and topographically modulated ...
Mesoscale Model Evaluation Testbed (MMET): A Resource for Transitioning NWP Innovations from Research to Operations (R2O)
Publisher: American Meteorological Society
Abstract: wide range of numerical weather prediction (NWP) innovations are under development in the research community that have the potential to positively impact operational models. The Developmental Testbed Center (DTC) helps ...
The Developmental Testbed Center and its Winter Forecasting Experiment
Publisher: American Meteorological Society
Abstract: The Weather Research and Forecasting (WRF) Developmental Testbed Center (DTC) was formed to promote exchanges between the development and operational communities in the field of Numerical Weather Prediction (NWP). The WRF ...