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Dual-Doppler analysis of shear features within a convective rainband of Hurricane Frances (2004)

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Dual-Doppler analysis of shear features within a convective rainband of Hurricane Frances (2004) Scott Gunter and John Schroeder Texas Tech University Lubbock Severe Weather Conference February 17, 2010 . Research Objectives.

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Dual-Doppler analysis of shear features within a convective rainband of Hurricane Frances (2004)

Scott Gunter and John Schroeder

Texas Tech University

Lubbock Severe Weather Conference

February 17, 2010

research objectives
Research Objectives
  • A robust dataset was collected as Hurricane Frances made landfall on the eastern coast of Florida on 5 September 2004. This dataset included dual-Doppler coverage of a convective cell in an outer rainband. Using this dataset, the objectives of this research are:
    • To characterize the kinematic structure of the convective cell and compare it to current conceptual models.
    • Examine changes in the kinematic structure of the convective cell as it crosses the coastline.
conceptual models previous research
Conceptual Models/Previous Research

 Powell (1990)

Hence and Houze (2008) 

hurricane frances smart r deployment
Hurricane Frances SMART-R Deployment
  • SR-1 deployed at Merritt Island Regional Airport
  • SR-2 deployed at the Space Coast Regional Airport in Titusville.
  • Both radars sampled the northern portions of Frances, including the convective outer rainband.
  • Several shear features are evident
data processing
Data Processing
  • Radar data were processed through REORDER and CEDRIC resulting in 35 x 20 x 2.2 km grids of reflectivity, velocity, and horizontal convergence with 100 m spatial resolution.
  • Two radar volumes were processed:
        • When the convective cell was immediately off shore
        • When the convective cell was immediately on shore
  • Roughly 5 minutes elapsed between radar volumes
preliminary analysis summary
Preliminary Analysis Summary
  • Preliminary analysis shows:
  • The convective cell compares nicely with conceptual models: convergence on inside of convection and speed max on outside
  • The convective cell seems to straddle the shear feature
  • The shear feature most pronounced at the lowest levels (especially the speed minimum)
  • Horizontal convergence decreases substantially with height
  • Horizontal convergence also decreases as the cell makes landfall
next steps
Next Steps…
  • Compute vertical velocity and vorticity for both volumes.
  • Construct vertical slices to evaluate dBz structure and kinematic properties
  • Compare with WSR-88D
references
References
  • Hence, D.A. and R.A> Houze Jr., 2008: Kinematic structure of convective-scale elements in the rainbands of Hurricanes Katrina and Rita (2005). Journal of Geophysical Research, 113, D15108, doi:10.1029/2007JD009429.
  • Powell, M.D., 1990a: Boundary layer structure and dynamics in outer hurricane rainbands. Part I: Mesoscale rainfall and kinematic structure. Monthly Weather Review , 118, 891-917.
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