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Original Articles

A study of planetary wave errors in a spectral numerical weather prediction model

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Pages 197-211 | Received 27 Sep 1977, Published online: 15 Nov 2010
 

Abstract

A series of fifteen 96‐h forecasts made with a spectral numerical weather prediction model is studied with reference to errors in the planetary wavelengths. The major contributor to the short (less than 48‐h) range forecast error is identified as an external mode. The medium range forecast error (96 h) is internal in character and reflects a deficiency in the simulation of the quasi‐stationary components.

Résumé

Les erreurs de simulation des ondes planétaires atmosphériques ont été étudiées à l'aide d'un ensemble de quinze prévisions numériques de 96 h tirées d'un modèle spectral. Il est démontré qu'un mode externe est engrande partie responsable de l'erreur de prévision à courte échéance (moins de 48 h). L'erreur de prévision à moyenne échéance (96 h) est de caractère interne, et reflète une déficience du modèle à simuler adequatement les composantes quasi‐stationnaires.

Notes

Present affiliation: Atmospheric Environment Service, Toronto, Ontario.

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