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

“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

WRF GNR Great North Run 3 nests with feedback between nests; 81 vertical levels; Domains are 356x x x328 Inner domain covers from Berwick to Nottingham

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

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

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 mb thickness

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

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

23/02/08: 12Z T+60

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

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

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

WRF GNR: 1km results

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

“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

COPS Convective and Orographically-induced Precipitation Study

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

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

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

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

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