1. The MJO Precipitating Cloud Population over the Central Indian Ocean as seen by the TRMM PR Hannah C. Barnes Robert A. Houze, Jr. University of Washington MJO Field Data and Science Workshop 5 March 2013, Hapuna Beach Resort, Kohala Coast, Hawaii

2. Precipitating Cloud Population By Phase Isolated, Shallow EchoesDeep Convective CoresBroad Stratiform Regions Active Suppressed

3. Relationship Between Precipitating Cloud Population and Large-Scale Conditions Pre-ActiveActivePost-Active Phase1234 DCCPeakDecrease WCC, BSRIncreasePeakDecrease Mid-Level Relative Humidity Sharp Increase Slower Increase PeakDecrease 1000-750 hPa Shear IncreasePeak 750-500 hPa Shear IncreasePeak

5. Large-Scale Conditions Solid lines = active, dashed = suppressed Relative Humidity (%) Pressure (hPa) 8 1 2-32-3 4 Zonal Wind (ms -1 ) 1 2 32 3 4

6. MJO Phase Large-Scale 1000-750 hPa Shear ms -1 Frequency (%) ISE DCC WCC BSR Shading = shear magnitude Number

7. MJO Phase Large-Scale 750-500 hPa Shear ms -1 Frequency (%) ISE DCC WCC BSR Shading = shear magnitude

8. Acknowledgements Funding DOE DE-SC0001164 / ER-64752 and DE-SC0008452 DYNAMO – NSF AGS-1059611 PMM-NASA Grant NNX10AH70G