Two tornadoes struck the Dallas area last night and were widely captured on video. The first one on the northwest side of town is shown in the radar images below (#1 on the map). I believe the one in the video at the bottom of this page is from the twister that was to the southeast of Dallas (the reports at #2; Dallas Metro area highlighted on the map below). You can read more about the storms and see pictures on Meteorological Musings.
In this 3-D visualization (images by GRAnalyst) the storm's core is shown at right with the hook echo producing the tornado at left.
With this cross-section we are looking the opposite direction with the hook echo and tornado on the right side of the image:
Here is the "classic" radar reflectivity image showing the hook echo. I also captured a storm-relative velocity image where you can see the couplet of red & green indicating rotation, and If you zoom out and go back in time a little, you can see the hook echo from the second tornado as well.
Here is the video of Tornado #2:
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