1. DYnamical and Microphysical Evolution of Convective Storms Thorwald Stein, Robin Hogan, John Nicol DYMECS

2. MetOffice Nimrod data Rainfall radar images 1km res 5min interval 1/32=0.03125 mm/hr 50 100 150 200 250 Rainfall [mm/hr] for 7 August 2010 06:10:00 Centered around the Chilbolton radar location

3. 0.5 mm/hr Labelling algorithm Threshold for minimum rainfall Threshold for minimum feature size (4km 2 ) 50 100 150 200

4. 2.0 mm/hr Labelling algorithm Threshold for minimum rainfall Threshold for minimum feature size (4km 2 ) 50 100 150 200

5. 1.0 mm/hr Labelling algorithm Threshold for minimum rainfall Threshold for minimum feature size (4km 2 ) 50 100 150 200

6. 1.0 mm/hr Keep label consistent between images (red) Register break ups (yellow) Highlight new storms (green) Store track (magenta) and lifetime 50 100 150 200

7. Per storm, store: – Area – Azimuth – Range – [u,v] – Centroid – Bounding box – Et cetera... Local rainfall maxima within storm (core, cell) work in progress... 50 100 150 200

8. Scan scheduler: – Read nimrod scene – Prioritize storms – Issue radar commands Scan strategy: – 4 RHI scans through each core in (clockwise- most) storm 1 – PPI volume scan (10 PPIs) through storm 1 – Repeat for next storm (anti-clockwise) – Finish with low-level PPI back to 1 50 100 150 200 26 th August Flooding South Wales

9. 26 th August 2011 (Floods in South Wales)

10. 093248 095442

11. 105917 112904

12. 154050 155927

13. 160955 161948

14. Stats at 2deg/s 32 pulse pairs About 0.5% of all rays are missing (data not written?) At 1deg/s and 64 pulse pairs, <<1% is missing.

15. Erroneous scans

16. Further issues 1.No phase parameters beyond 180km 2.Radar error no position received occurs after 10-20% of commands 3.AR_NEW recorded in netCDF, not FRATE when WI>180