1 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Update on Weather-Situation Dependent COSMO-7 Verification against Radar Data Results of 2006 Emanuele Zala, Daniel Leuenberger MeteoSwiss

2 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger 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 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Data Sets and Methodology RADAR fields mapped on COSMO-7 grid:

4 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Weather Type Classification subjective mainly based on 500hPa geopotential/winds classes: yearlowhighflatNNEESESSWWNW

5 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Weather Class „LOW“ (20 days)

6 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Weather Class „HIGH“ (91 days)

7 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Weather Class „FLAT“ (41 days)

8 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Weather Class „NORTH“ (17 days)

9 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Weather Class „SW“ (75 days)

10 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Weather Class „WEST“ (49 days)

11 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger Weather Class „NW“ (50 days)

12 COSMO GM, Athens/2007 | E. Zala; D. Leuenberger 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