Browsing by Subject "Dual-doppler"
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Item Examination of the Coastal Transition Zone in Hurricane Frances (2004)(2011-05) Hirth, Brian D.; Schroeder, John L.; Weiss, Christopher C.; Smith, Douglas A.Understanding the structure of the coastal internal boundary layer (IBL) during the landfall of a tropical cyclone has important ramifications on operational forecasting, structural design, and post-storm damage assessment. Despite these important issues, it is unclear how the structure of the IBL evolves at the coastline on micro- and meso-scales during a landfalling hurricane. Knowledge of the vertical kinematic structure within tropical cyclones over water has improved greatly through aircraft reconnaissance missions and the advent of GPS dropsondes and the Stepped Frequency Microwave Radiometers. Unfortunately, reconnaissance and research aircraft are limited to over-water missions resulting in a poor understanding of vertical kinematic structure near the coastal interface where changes in IBL structure are expected due to changes in coastal geometry and surface roughness. Additionally, IBL structure may evolve due to the passage of convective precipitation and associated downdrafts. A unique observational dataset was collected from the coastal transition zone in the onshore flow region of Hurricane Frances (2004) over Cape Canaveral, FL. Single- and dual-Doppler radar data collected by the Shared Mobile Atmospheric Research and Teaching radars provide the ability to discern horizontal and vertical mean IBL structure over a complex coastal interface while assessing the influence of a variable underlying surface and the passage of transient convective wind gusts. Additional wind speed data were collected by a meso-network of surface towers operated by the Cape Canaveral Air Force Station and Kennedy Space Center along with a portable surface tower deployed by Texas Tech University. Radar and tower data analyses reveal that IBL mean structure over the Cape Canaveral remains quite consistent during the landfall of Hurricane Frances, though IBL growth is suppressed when compared to empirical growth models. Additionally, transient convective gusts commonly perturb the mean structure at the top of the IBL, though the higher momentum associated with these gusts is typically not able to descend to the surface within an established IBL.Item Observations of convective cells in an outer rainband of Hurricane Frances (2004)(2010-12) Gunter, William; Schroeder, John L.; Leary, Colleen; Bruning, EricAs Hurricane Frances made landfall on the eastern coast of Florida on 5 September 2004, Texas Tech University’s Hurricane Research Team deployed two mobile Doppler radars (the SMART-Rs) in the Cape Canaveral area. The dual-Doppler data collected during the deployment included a convective outer rainband that contained two cells with cyclonically rotating shear features. The data were synthesized with the purpose of documenting both the kinematic structure of the cells and the evolution of the cells as they crossed the coastline.