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Convection Initiation Near Mesoscale Convective Vortices

Convection Initiation Near Mesoscale Convective Vortices. Christopher A. Davis and Stanley B. Trier National Center for Atmospheric Research Boulder, Colorado, USA. Global View of MCCs (MCVs?). 60-h Radar Composite Animation (00 UTC 11 June – 12 UTC 13 June, 2003).

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Convection Initiation Near Mesoscale Convective Vortices

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  1. Convection Initiation Near Mesoscale Convective Vortices Christopher A. Davis and Stanley B. Trier National Center for Atmospheric Research Boulder, Colorado, USA

  2. Global View of MCCs (MCVs?)

  3. 60-h Radar Composite Animation (00 UTC 11 June – 12 UTC 13 June, 2003)

  4. Mesoscale Convective Vortices • Produced within organized convection • Dynamically balanced • Longevity depends on initiating new convection • Potential for QPF skill enhancement • Lifting and moistening above the PBL: a mesoscale imprint

  5. Bow Echo and MCV Experiment (BAMEX) NRL P-3 20 May – 6 July, 2003 WMI Lear Jet NOAA P-3 NRL P-3 MIPS

  6. 150 km IOP 1 IOP 4 IOP 5 1500 UTC 24 May 0600 UTC 1 June 1100 UTC 5 June X X X X IOP 8 IOP 15 MCV Origins X X X 0600 UTC 11 June 0500 UTC 29 June

  7. IOP 5 Mean Wind Profile 800 hPa dBz 2120 UTC 5 June 70 60 50 40 30 20 10 Locally Unstable T(ºC) m/s

  8. Mean Wind Profile IOP 15 750 hPa 2050 UTC 29 June dBz 70 60 50 40 30 20 -3º 10 Widespread Instability m/s

  9. IOP 8 Mean Wind Profile 900 hPa 1730 UTC 11 June dBz 70 60 50 X 40 30 20 10 Widespread Instability m/s

  10. Balance of MCVs Average Tinside RMW – Toutside RMW Thin line: balanced; Heavy line: obs Based on nonlinear balance Tv’ (K) Tv’ (K)

  11. Vertical Motion and Vertical Displacement:Idealized Simulations • Vertical Velocity (Turquoise < -3; Blue – 1 to –3; Orange 1 to 3; Red > 3 cm/s) • Vertical Displacements (200-m contour interval, negative values dashed) • Curves with arrowheads denote back trajectories from max upward displacement area • X denotes approximate vortex center Trier et al. 2000, Mon. Wea. Rev.

  12. Summary • Vortex-induced vertical displacement imprints mesoscale organization of convection • Convection downshear • Subsidence upshear • Balanced vortices amenable to data assimilation • Convective initiation points: coupling between PBL and mesoscale features.

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