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Author: Norman A. Phillips
Publisher:
ISBN:
Category : Atmospheric circulation
Languages : en
Pages : 0
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Author: Norman A. Phillips
Publisher:
ISBN:
Category : Atmospheric circulation
Languages : en
Pages : 0
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Author: Jay W. Colucci
Publisher:
ISBN:
Category : Weather forecasting
Languages : en
Pages : 134
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Assessment of the performance of the National Meteorological Center's (NMC) new Eta numerical weather prediction model requires objective evaluation through direct comparison of model forecast output to its own analysis and to the analysis of other numerical models. The ultimate goal of the Eta Model is to provide accurate mesoscale weather forecasts through the late 1990's which are superior to those currently provided by the older NGM. To accurately evaluate the Eta Model, several model forecast output fields were compared to the NGM for a common population of extratropical cyclones over a period of five months. The separate model forecasts were also evaluated against their own analysis. Selected fields included central sea level pressure. 12h central pressure change 1000-500 mb thickness at the cyclone center, and both convective and total precipitation at the cyclone center. Results indicated a consistent negative bias in forecast central pressure values for the NGM. and a positive bias for the Eta Model. Mean forecast position errors were nearly identical for both models through 36h with the Eta forecast position errors only slightly larger at 48h. Both models exhibited a slight cold bias in 1000-500 mb thickness fields at the cyclone centers with the NGM being greater. The Eta Model tended to forecast more precipitation in general and in particular the precipitation was higher for stable precipitation.
Author: Wenbin Wang
Publisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 658
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Author: James E. Hoke
Publisher:
ISBN:
Category : Numerical grid generation (Numerical analysis).
Languages : en
Pages : 9
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Author: James E. Hoke
Publisher:
ISBN:
Category : Numerical analysis
Languages : en
Pages : 7
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"Work is underway at the National Meteorological Center to improve the numerical analysis and forecast system in preparation for the scheduled upgrade of computational capability this year. Under the new system, very high priority will be given to improving operational forecasting of major precipitation events. One of several numerical models under consideration to supplement the Limited-area Fine-mesh Model (LFM) in this effort is the NMC Nested Grid Model (NGM). In this paper we will describe our efforts to overcome a key hurdle in implementing a regional-scale forecast model such as the NGM--initialization. The application of normal mode initialization to regional-scale models has been studied recently at NMC. Investigation has followed two paths. One approach involves determining the normal modes of the regional-scale model itself. In the second, normal mode initialization of a global or hemispheric model provides the initial conditions for the regional scale model. Discussion of the latter approach will be presented here. Our experimental procedure, including description of the analysis and initialization steps, is provided in the next section. Section 3 details the results of the experiments, with concluding remarks in Section 4"--Introduction.
Author: James J. Tuccillo
Publisher:
ISBN:
Category : Numerical weather forecasting
Languages : en
Pages : 24
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Author: Paul Richard Janish
Publisher:
ISBN:
Category : Cold waves (Meteorology)
Languages : en
Pages : 314
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Author: Robert A. Beasley
Publisher:
ISBN:
Category : Precipitation (Meteorology)
Languages : en
Pages : 17
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Author:
Publisher:
ISBN:
Category : Numerical grid generation (Numerical analysis).
Languages : en
Pages : 8
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Author: Robert W. Jones
Publisher:
ISBN:
Category : Cyclones
Languages : en
Pages : 50
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