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John Molinari and Michael Dudek

326 MONTHLY WEATHER REVIEW VOLUME 120Parameterization of Convective Precipitation in Mesoscale Numerical Models: A Critical Review JOHN MOLINARI AND MICHAEL DUDEKDepartment of Atmospheric Science, State University of New York at Albany, Albany, New York(Manuscript received 30 November 1990, in final form 24 June 1991) Current approaches for incor0orating

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Andrew Staniforth and Jean Côté

2206 MONTHLY WEATHER REVIEW VOLUME 119Semi-Lagrangian Integration Schemes for Atmospheric Modeis--A Review ANDREW STANIFORTH AND JEAN C(~T~Recherche en pr~vision nurndrique, Service de l'environnernent atmosph~rique, Dorval, Quebec, Canada(Manuscript received 24 September 1990, in final form I March 1991) The semi-Lagrangian methodology is described for a hierarchy of applications (passive advection

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Loïk Berre and Gérald Desroziers

representation of effects from data density variations and atmospheric spatial variabilities was noted, and positive impacts were observed on the forecast quality of the Météo-France NWP system. Deriving flow-dependent local variances from an ensemble variational assimilation was then attempted by Kucukkaraca and Fisher (2006) , with encouraging results on cases of midlatitude storms and tropical cyclones. Another possible step is to relax the application of the homogeneity assumption with respect to

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Paul M. Markowski

(37%) of the hook echoes associated with the first tornado produced by a supercell were detected after the reported 3 tornado formation times. Forbes (1981) found a false alarm rate of just 16% when using hook echoes to detect tornadoes. But because hook echoes were relatively rare (as he defined them), a less restrictive shape (a “distinctive echo”, e.g., appendages, line-echo wave patterns, etc.) also was considered. Distinctive echoes were associated with a probability of detection of

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Craig S. Schwartz and Ryan A. Sobash

produced and interpreted, it is impossible to fully comprehend verification results. 3. Demonstration of differences between NEP and NMEP NEPs and NMEPs from convection-allowing ensemble forecasts were objectively verified. Our goal is not to thoroughly validate ensemble performance, but, rather, to simply demonstrate how NEP and NMEP can yield statistically significant different conclusions about model performance. a. Forecast model The National Center for Atmospheric Research’s (NCAR

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