Articles | Volume 6, issue 5
Nat. Hazards Earth Syst. Sci., 6, 755–760, 2006
https://doi.org/10.5194/nhess-6-755-2006

Special issue: Advances in radar, multi-sensor and hydrological modelling...

Nat. Hazards Earth Syst. Sci., 6, 755–760, 2006
https://doi.org/10.5194/nhess-6-755-2006

  04 Sep 2006

04 Sep 2006

A case study carried out with two different NWP systems

P. Kållberg1 and A. Montani2 P. Kållberg and A. Montani
  • 1SMHI, S-601 76 Norrköping, Sweden
  • 2ARPA-SIM, Viale Silvani 6, 40122 Bologna, Italy

Abstract. A model intercomparison between two atmospheric models, the non–hydrostatic Lokal Modell (LM) and the hydrostatic HIgh Resolution Limited Area Model (HIRLAM) is carried out for a one-week period, including a case of cyclogeneis leading to heavy precipitation over Northern Italy. The two models, very different in terms of data-assimilation and numerics, provide different results in terms of forecasts of surface fields. Opposite diurnal biases for the two models are found in terms of screen level temperatures. HIRLAM wind speed forecasts are too strong, while LM precipitation forecasts have larger extremes. The intercomparison exercise identifies some systematic differences in the weather products generated by the two systems and sheds some light on the biases of the two numerical weather prediction systems.

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