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RISCan Gradient Information Be Used to Improve Variational Objective Analysis?
Publisher: American Meteorological Society
Abstract: A variational scheme for the analysis of scalar variables is developed and compared to two-pass and three-pass versions of the Barnes analysis scheme. The variational scheme, appropriate for diagnostic studies, is similar ...
Simulating Flash Flood Events: Importance of the Subgrid Representation of Convection
Publisher: American Meteorological Society
Abstract: The Pennsylvania State University?NCAR Mesoscale Model is used to simulate six flash flood events that occurred in the central and eastern United States. Results suggest that standard model simulations of 24-h accumulated ...
Computing Divergence from a Surface Network: Comparison of the Triangle and Pentagon Methods
Publisher: American Meteorological Society
Abstract: Two methods for creating gridded fields of divergence from irregularly spaced wind observations are evaluated by sampling analytic fields of cyclones and anticyclones of varying wavelengths using a surface network. For the ...
A Quantitative Comparison between Traditional and Line Integral Methods of Derivative Estimation
Publisher: American Meteorological Society
Abstract: For diagnostic purposes, the ?traditional? approach to estimating derivatives employs objective analysis to provide a gridded field from the original observations, which are typically not uniformly distributed in space. ...
Diagnosis of an Amplifying and Decaying Baroclinic Wave Using Wind Profiler Data
Publisher: American Meteorological Society
Abstract: Kinematic and thermodynamic quantities derived from wind profiler triangles are used to help describe the structure of both an amplifying and decaying baroclinic wave as they traversed portions of the wind profiler ...
A Four-Dimensional Objective Analysis Scheme and Multitriangle Technique for Wind Profiler Data
Publisher: American Meteorological Society
Abstract: A 4D Barnes objective analysis scheme for wind profiler data is developed in order to improve upon previously developed 2D analysis schemes. A significant shortcoming of the 2D schemes is their sensitivity to gaps in the ...
Choosing the Smoothing Parameters within a Multiple-Pass Barnes Objective Analysis Scheme: A Cautionary Note
Publisher: American Meteorological Society
Abstract: Various combinations of smoothing parameters within a two-pass Barnes objective analysis scheme are applied to analytic observations obtained by regular and irregular sampling of a one-dimensional sinusoidal analytic wave ...
A Comparison of Two Objective Analysis Techniques for Profiler Time-Height Data
Publisher: American Meteorological Society
Abstract: Two methods for objective analysis of wind profiler data in time-height space are proposed and compared. One is a straightforward adaptation of a procedure developed by Doswell for introducing time continuity into a sequence ...
The National Severe Storms Laboratory Mesocyclone Detection Algorithm for the WSR-88D
Publisher: American Meteorological Society
Abstract: The National Severe Storms Laboratory (NSSL) has developed a mesocyclone detection algorithm (NSSL MDA) for the Weather Surveillance Radar-1988 Doppler (WSR-88D) system designed to automatically detect and diagnose the ...
Improved Detection of Severe Storms Using Experimental Fine-Resolution WSR-88D Measurements
Publisher: American Meteorological Society
Abstract: Doppler velocity and reflectivity measurements from Weather Surveillance Radar-1988 Doppler (WSR-88D) radars provide important input to forecasters as they prepare to issue short-term severe storm and tornado warnings. ...