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What is Storm Relative Velocity?

Daphne Thompson
Jun 16, 2016 9:35:11 AM

If you’ve ever looked at your RadarScope velocity menu, you have seen super-res velocity, base velocity, and this product named Storm Relative Mean Velocity. But what is it and how does it differ from other velocity products?

 

Storm Relative Mean Velocity is base velocity with the average storm motion subtracted out. When storms are moving quickly, their motion can mask rotation in the storm. If we remove the storm motion, it gives us data as if the storm was stationary. Looking at the two images below, you can see a velocity couplet in Figure 1, but it doesn’t show up well in Figure 2. However, if we look at the interesting area near the bottom, we can see that the velocity couplet becomes much more apparent. Using this product can sometimes make it easier to spot velocity couplets that are indicative of rotation.

 

Velocity Images

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