1. Federal Department of Home Affairs FDHA Federal Office of Meteorology and Climatology MeteoSwiss WG5-Report from Switzerland: Verification of COSMO in the year 2007 Francis Schubiger, Pirmin Kaufmann, Christophe Hug, Emanuele Zala, Guy de Morsier, Daniel Leuenberger MeteoSwiss COSMO General Meeting 2007 WG5 Parallel Session 18 September 2007

2. 2 WG5-Report from Switzerland: Verification of COSMO in 2007 Surface over Switzerland (1h-steps, ANETZ) T2m, Td2m, 10m wind, cloud cover and precipitation Surface (3h-steps, SYNOP) psred, ps, T2m, Td2m, 10m-wind, cloud cover and precipitation Upper-air (TEMP) T,  RH, wind integrated water vapor content with GPS data Precipitation with RADAR weather-type dependant verification with RADAR and TEMP Fluxes at Payerne Windprofiler Payerne and Kloten VAD (locations of swiss radars) COSMO: Verification packages

3. 3 WG5-Report from Switzerland: Verification of COSMO in 2007 Verification of surface weather parameters WP 5.1.1 and WP 5.1.7 verification of COSMO surface weather parameters with SYNOP stations (every 3h) and with ANETZ (every 1h) operational, ongoing as in 2006 extension to compute diurnal cycle in 3h-steps with SYNOP data results sent to the COSMO website 2m-temperature: mean error -> exaggerated diurnal amplitude and too high max in Spring 2007 spring 2007 summer 2007

4. 4 WG5-Report from Switzerland: Verification of COSMO in 2007 2m-temperature Spring 2007 SYNOP stations mean error SYNOP & COSMO-7

5. 5 WG5-Report from Switzerland: Verification of COSMO in 2007 2m-temperature Spring 2007 Switzerland (ANETZ) gridpoints < 800m increasing bias with lead time

6. 6 WG5-Report from Switzerland: Verification of COSMO in 2007 Summary / main results in 2007 2m-temperature: in Spring exaggerated amplitude, too high max precipitation: extreme high positive bias at the borders of the model (N and E) since Autumn 2006

7. 7 WG5-Report from Switzerland: Verification of COSMO in 2007 Dependency of lead-time for COSMO-2 22.06.07-09.07.07: 8 daily fcst up to +69h +3 +12 +24 +36 +48 +60 +69 standard deviation of errors at SYNOP-locations 2m-temperature 2m-dewpoint

8. 8 WG5-Report from Switzerland: Verification of COSMO in 2007 +3 +12 +24 +36 +48 +60 +69 Dependency of lead-time for COSMO-2 22.06.07-09.07.07: 8 daily fcst up to +69h standard deviation of errors at SYNOP-locations pressure msl pressure

9. 9 WG5-Report from Switzerland: Verification of COSMO in 2007 +3 +12 +24 +36 +48 +60 +69 Dependency of lead-time for COSMO-2 22.06.07-09.07.07: 8 daily fcst up to +69h standard deviation of errors at SYNOP-locations 10m-wind direction 10m-windspeed

10. 10 WG5-Report from Switzerland: Verification of COSMO in 2007 +3 +12 +24 +36 +48 +60 +69 Dependency of lead-time for COSMO-2 22.06.07-09.07.07: 8 daily fcst up to +69h standard deviation of errors at SYNOP-locations cloud cover precipitation

11. 11 WG5-Report from Switzerland: Verification of COSMO in 2007 Verification of test chains in 2007: main results Runge-Kuttta shows a positive impact on temperature, wind and humidity in the atmosphere and for precipitation (reduction of the overestimation) Forecasts with newest BC from IFS (i.e. from 00 UTC instead of 18 UTC) shows some improvements but not as much as expected from an earlier testchain with also a later assmilation cycle with newest BC 6.6 km version (0.6 deg instead of 0.625 deg) gives very similar results

12. 12 WG5-Report from Switzerland: Verification of COSMO in 2007 Runge Kutta testchain: verification with SYNOP: pressure opr RK opr RK Period: 10-23.01.2006

13. 13 WG5-Report from Switzerland: Verification of COSMO in 2007 Runge Kutta testchain: verification with SYNOP: precipitation Period: 10-23.01.2006 operational

14. 14 WG5-Report from Switzerland: Verification of COSMO in 2007 Runge Kutta testchain: verification with SYNOP: precipitation Period: 10-23.01.2006 Runge Kutta reduction of precipitation overestimation, due to much less high amounts (10 mm/12h)

15. 15 WG5-Report from Switzerland: Verification of COSMO in 2007 Runge Kutta testchain: verification with TEMP: temperature 4 periods: 10-23.01.2006 15-28.05.2006 15-28.11.2006 02-15.08.2007 Runge Kutta operational

16. 16 WG5-Report from Switzerland: Verification of COSMO in 2007 Runge Kutta testchain: verification with TEMP: windspeed Runge Kutta operational 4 periods: 10-23.01.2006 15-28.05.2006 15-28.11.2006 02-15.08.2007

17. 17 WG5-Report from Switzerland: Verification of COSMO in 2007 Testchain new soil model verification with TEMP: geopotential Period: 1-31.12.2005 much better results due to newest BC in assimilation cycle and forecasts ? new soil model operational

18. 18 WG5-Report from Switzerland: Verification of COSMO in 2007 Testchain newest BC in forecast verification with TEMP: geopotential period: 17-31.03.2007 newest BC operational newest BC = IFS BC from fcst of 00 UTC instead of 18 UTC

19. 19 WG5-Report from Switzerland: Verification of COSMO in 2007 Testchain newest BC in forecast verification with TEMP: geopotential period: 09-23.06.2007 newest BC operational newest BC = IFS BC from fcst of 00 UTC instead of 18 UTC

20. 20 WG5-Report from Switzerland: Verification of COSMO in 2007 Verification of aLMo integrated water vapor content with GPS data WP 5.4.3 ongoing as in 2006 Validation of near-surface boundary layer processes WP 5.5.1 ongoing as in 2006 extension for verification of the windprofiler at Payerne (for selected days/months or selected heights)

21. 21 WG5-Report from Switzerland: Verification of COSMO in 2007 Exchange of maps at the COSMO website WP 5.1.6 new in 2007: charts on the common same area

22. 22 WG5-Report from Switzerland: Verification of COSMO in 2007 24h-precipitation 06.09.07 00 UTC: +6..+30h COSMO-DE [DWD]

23. 23 WG5-Report from Switzerland: Verification of COSMO in 2007 24h-precipitation 06.09.07 00 UTC: +6..+30h COSMO-7 [MeteoSwiss]

24. 24 WG5-Report from Switzerland: Verification of COSMO in 2007 24h-precipitation 06.09.07 00 UTC: +6..+30h COSMO-PL [IMGW]

25. 25 WG5-Report from Switzerland: Verification of COSMO in 2007 24h-precipitation 06.09.07 00 UTC: +6..+30h COSMO-I7 [ARPA-SIM]

26. 26 WG5-Report from Switzerland: Verification of COSMO in 2007 24h-precipitation 06.09.07 00 UTC: +6..+30h COSMO-ME [CNMCA]

27. 27 WG5-Report from Switzerland: Verification of COSMO in 2007 2m-temperature errors (DMO & kalman) vs obs Davos April 2006 – March 2007 +0.. +24h +48.. +72h +24.. +48h cases with snow in model COSMO-7 blue dots : DMO green dots: kalman Vanessa Stauch Project OptiControl

28. 28 WG5-Report from Switzerland: Verification of COSMO in 2007 +0.. +24h +48.. +72h +24.. +48h 2m-temperature errors vs obs Davos April 2006 – March 2007 only cases with snow in model blue dots : DMO green dots: kalman Vanessa Stauch Project OptiControl

29. 29 WG5-Report from Switzerland: Verification of COSMO in 2007 Probability density function 2m-temperature Davos April 06 – March 07 blue dots : DMO green dots: kalman Vanessa Stauch Project OptiControl

30. 30 WG5-Report from Switzerland: Verification of COSMO in 2007 Subjective verification of COSMO-7 vs COSMO-2 by the forecasters of the three MeteoSwiss forecasting centres in Spring 2007