1. http://www.ncas.ac.uk This is the footer WRF : “Great North Run” and COPS Ralph Burton, NCAS (Leeds) Alan Gadian, NCAS (Leeds) Alison Coals, NCAS (Leeds)

2. http://www.ncas.ac.uk “Operational use” : a 1-km forecast model for the north of the UK “Research use” COPS (Convective and Orographically-induced Precipitation Study) WRF: examples of use

3. http://www.ncas.ac.uk WRF GNR Great North Run 3 nests with feedback between nests; 81 vertical levels; Domains are 356x196 (@9km) 319x322 (@3km) 391x328 (@1km) Inner domain covers from Berwick to Nottingham

4. http://www.ncas.ac.uk WRF GNR A useful exercise for PhD students / Postdocs In Leeds, every Thursday there is a “Chatmosphere” (students and staff discuss the forecast, interesting weather, etc.) Get students to perform a WRF forecast for the North of England Takes approx 2 x 2hr teaching sessions for students to be able to do the forecast independently

5. http://www.ncas.ac.uk WRF GNR Ongoing WRF verification / evaluation Each week a set of forecast plots is produced, allowing an ongoing evaluation of WRF performance Forecast plots are archived

6. http://www.ncas.ac.uk WRF GNR Routinely, every Wednesday WRF is run, and the plots produced on Thursday morning. Plots produced, for T=0, 1, 2,..., 60: Sea – level pressure, surface temps and winds Precipitation Skew-T for Leeds-Bradford Airport 850mb theta_e 1000-500mb thickness

7. http://www.ncas.ac.uk WRF GNR SLP, surface winds and temps Precip in last hour

8. http://www.ncas.ac.uk WRF GNR: comparison with satellite data 23/02/08: 12Z T+60

9. http://www.ncas.ac.uk 23/02/08: 12Z T+60

10. http://www.ncas.ac.uk WRF GNR: comparison with satellite data 23/02/08: 12Z T+60 Cloud water mixing ratio = 0.1g / Kg

11. http://www.ncas.ac.uk Cloud water mixing ratio = 1g / Kg 23/02/08: 12Z : T+60

12. http://www.ncas.ac.uk WRF GNR Skew-T for 23/02/08 12Z: T+60: Nottingham WRF Observed

13. http://www.ncas.ac.uk WRF GNR: 1km results

14. http://www.ncas.ac.uk WRF GNR: 1km results 23/02/08: 12Z (T+60)

15. http://www.ncas.ac.uk “Operational use” : a 1-km forecast model for the north of the UK “Research use” COPS (Convective and Orographically-induced Precipitation Study) WRF: examples of use

16. http://www.ncas.ac.uk COPS Convective and Orographically-induced Precipitation Study http://www.cops2007.de

17. http://www.ncas.ac.uk COPS WRF Note the location and orientation (SW-NEish) of the storm cloud 15 th July: isolated deep convective cloud

18. http://www.ncas.ac.uk WRF COPS 3 Domains: 300 x 300 301 x 301 199 x 199 (6.3km, 2.1km, 700m)

19. http://www.ncas.ac.uk COPS WRF Upward moisture flux at surface; 10m wind vectors 15/07/07 15Z Strong convergence; relatively high upward moisture flux “upwind” of the convergence line

20. http://www.ncas.ac.uk COPS WRF 10m wind vectors over orography with cross-section of W over the convergence line; 15Z +ve vertical velocities not appreciable above 5km Wave-like features +ve W -ve W

21. http://www.ncas.ac.uk COPS WRF... but: no cloud in the WRF run! We think we know why this, is and work is still ongoing. Summary WRF is used at the University of Leeds in a routine forecast manner WRF is being used to investigate the 15 th July cloud