Dual-Doppler analysis of shear features within a convective rainband of Hurricane Frances (2004)
This presentation is the property of its rightful owner.
Sponsored Links
1 / 24

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


  • 38 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

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

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Dual doppler analysis of shear features within a convective rainband of hurricane frances 2004

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 2004

Hurricane Frances (2004)


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


Shear features 1 and 2

Shear Features 1 and 2


Shear feature 3 from the melbourne fl wsr 88d

Shear Feature 3 from the Melbourne, FL, WSR-88D


Shear feature 3

Shear Feature 3


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.


  • Login