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Update on Weather-Situation Dependent COSMO-7 Verification against Radar Data Results of 2006

This study evaluates the performance of the COSMO-7 model using radar data, focusing on precipitation sums and weather type classification. The results highlight biases in different weather patterns, particularly in weak advection and flat terrain.

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Update on Weather-Situation Dependent COSMO-7 Verification against Radar Data Results of 2006

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  1. Update on Weather-Situation Dependent COSMO-7 Verification against Radar DataResults of 2006 Emanuele Zala, Daniel Leuenberger MeteoSwiss

  2. Data Sets and Methodology RADAR • Radar: 24h precipitation sums from 06 UTC to 06 UTC • MeteoSwiss network composite „rain“ product • horizontal resolution: 2x2km • visibility-, clutter- and bias-corrected COSMO-7 model: • +06h to +30h precipitation sums from all 00UTC runs • horizontal resolution 7x7km BIAS correction map of radar data against rain gauges (Long-term corrections)

  3. Data Sets and Methodology RADAR fields mapped on COSMO-7 grid:

  4. Weather Type Classification • subjective • mainly based on 500hPa geopotential/winds • classes:

  5. Weather Class „LOW“ (20 days)

  6. Weather Class „HIGH“ (91 days)

  7. Weather Class „FLAT“ (41 days)

  8. Weather Class „NORTH“ (17 days)

  9. Weather Class „SW“ (75 days)

  10. Weather Class „WEST“ (49 days)

  11. Weather Class „NW“ (50 days)

  12. Conclusions • Smaller biases in weak advection • Overestimation on upstream side of topography • Tendency to underestimation in flat terrain • Special: SW-flow: Large underestimation over Jura mountains and Swiss Plateau • Similar results in 2004 and 2005

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