DAX Radar
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Storm Relative Motion
When looking for rotation in thunderstorms (trying to determine if there is a tornado) the overall motion of the storm can mask any storm circulation as seen in a Base velocity image. If the overall motion of the storms is subtracted from the velocity, the wind circulation relative to the storm itself will become more evident. It is a picture of the wind circulation around a storm when the overall motion of the storm is subtracted. In effect, what is seen is the wind’s motion as if the storm was stationary. As before, the radar will only see the radial velocity. For small scale thunderstorm circulations, from which tornadoes often form, will typically be indicated by strong inbound wind located along side strong outbound wind relative to the radar. When looking at Storm Relative Motion it is very extremely to know where the radar is located.  Tornadic circulations are cyclonic (counter-clockwise). So adjacent red and green colors need to be on the proper side in order to determine if there is a possible tornadic signature.