An analysis of the axisymmetric three‐dimensional low level wind field in a tornado using mobile radar observations

[1] The purpose of this letter is to present an analysis of the three-dimensional wind field retrieved from mobile Doppler radar data of the 12 May 2004 Harper, KS tornadoes. The derived three-dimensional vortex structure and its surrounding flow show marked temporal and spatial variability. This has significant implications on the numerical modeling of tornado-scale flow.

[1]  Wen-Chau Lee,et al.  Diagnosed Three-Dimensional Axisymmetric Structure of the Mulhall Tornado on 3 May 1999 , 2005 .

[2]  Andrew L. Pazmany,et al.  Observations of Tornadoes and Other Convective Phenomena with a Mobile, 3-mm Wavelength, Doppler Radar: The Spring 1999 Field Experiment , 2000 .

[3]  Vincent T. Wood,et al.  On the Interpretation of Single-Doppler Velocity Patterns within Severe Thunderstorms , 1991 .

[4]  J. Xia,et al.  The Influence of a Local Swirl Ratio on Tornado Intensification near the Surface , 2000 .

[5]  Howard B. Bluestein,et al.  Tornadoes and Tornadic Storms , 2001 .

[6]  Wen-Chau Lee,et al.  Tropical Cyclone Kinematic Structure Retrieved from Single-Doppler Radar Observations. Part I: Interpretation of Doppler Velocity Patterns and the GBVTD Technique , 1999 .

[7]  Bin Wang,et al.  Reexamining the Near-Core Radial Structure of the Tropical Cyclone Primary Circulation: Implications for Vortex Resiliency , 2005 .

[8]  Erik N. Rasmussen,et al.  Fine-Scale Doppler Radar Observations of Tornadoes , 1996, Science.

[9]  Erik N. Rasmussen,et al.  Design and Deployment of a Portable, Pencil-Beam, Pulsed, 3-cm Doppler Radar , 1997 .

[10]  Curtis R. Alexander,et al.  Centrifuging of Hydrometeors and Debris in Tornadoes: Radar-Reflectivity Patterns and Wind-Measurement Errors , 2005 .

[11]  Wen-Chau Lee,et al.  Tropical Cyclone Kinematic Structure Retrieved from Single-Doppler Radar Observations. Part III: Evolution and Structures of Typhoon Alex (1987) , 2000 .

[12]  Vincent T. Wood,et al.  Effects of Radar Proximity on Single-Doppler Velocity Signatures of Axisymmetric Rotation and Divergence , 1992 .

[13]  An unexpected pattern of distinct weekly periodicities in climatological variables in Germany , 2007 .

[14]  Curtis R. Alexander,et al.  The 30 May 1998 Spencer, South Dakota, Storm. Part II: Comparison of Observed Damage and Radar-Derived Winds in the Tornadoes , 2005 .

[15]  Swarndeep Gill,et al.  Finescale Radar Observations of the Dimmitt, Texas (2 June 1995), Tornado , 2000 .