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WRF : “Great North Run” and COPS

WRF : “Great North Run” and COPS. Ralph Burton, NCAS (Leeds) Alan Gadian, NCAS (Leeds) Alison Coals, NCAS (Leeds). WRF: examples of use. “Operational use” : a 1-km forecast model for the north of the UK “Research use” COPS (Convective and Orographically-induced Precipitation Study).

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WRF : “Great North Run” and COPS

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

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

  3. 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. 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. 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. 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. WRF GNR SLP, surface winds and temps Precip in last hour

  8. WRF GNR: comparison with satellite data 23/02/08: 12Z T+60

  9. 23/02/08: 12Z T+60

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

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

  12. WRF GNR Skew-T for 23/02/08 12Z: T+60: Nottingham Observed WRF

  13. WRF GNR: 1km results

  14. WRF GNR: 1km results 23/02/08: 12Z (T+60)

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

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

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

  18. WRF COPS 3 Domains: 300 x 300 301 x 301 199 x 199 (6.3km, 2.1km, 700m)

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

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

  21. 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 15th July cloud

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