Much of the primary damage swath appeared to have been created by the low-level vortex. Rather, the primary damage swath was found north of the bow apex, collocated with a low-level vortex that formed on the leading edge of the bow echo. Careful superposition of the damage survey analysis and Weather Surveillance Radar-1988 Doppler (WSR-88D) data from Saint Charles, Missouri (KLSX), showed that the primary straight-line wind damage swath was not collocated with the bow echo apex as has been suggested in previous studies. A bow echo formed just east of Saint Louis, Missouri, and produced a continuous straight-line wind damage swath approximately 8 km in width and 50 km in length along with five F0–F1 tornadoes. The inset diagram in (a) displays storm-relative radial velocities in the area of the dashed box.ĭetailed radar and damage survey analyses of a severe bow echo event that occurred on 10 June 2003 during the Bow Echo and Mesoscale Convective Vortex (MCV) Experiment are presented. Surface data are also plotted in (a), showing the winds, temperature, and dewpoint following the convention used in Fig. Thin-dashed lines are the range–azimuth grid lines for the KLSX radar. The thick-dashed line represents the approximate location of the RIJ. The inset radial velocity data in (a) are relative to mesovortex 6. The blue contour represents the 25 m s −1 radial velocity isopleth observed at 2.4° with values greater 30 m s −1 filled. Couplet locations and time stamps are indicated along the mesovortex tracks. In all panels, the positions of tornadic and nontornadic mesovortices are shown as solid and dashed black lines, respectively. 7 superimposed on KLSX 0.5° radar reflectivity data (dB Z) and ground-relative radial velocities at (a) 2300, (b) 2310, (c) 2320, (d) 2330, and (e) 2340 UTC.
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