In this exercise we're gonna change the storm motion in the radar display controls and set the DMD filters. 

So first let's go to WFO scale under the scales menu. Under the frames count we're gonna go to 120 frames. And then under kcri we're gonna load zero point or the all tilts based data. Right when this comes up we're gonna go ahead and hit the dot key on the keypad to toggle over to reflectivity. Then we're going to use the up arrow to tilt upward. And it's gonna cycle over to the 0.5 degree tilt to 23:38. So we're gonna look at this storm way up to the northeast on the Oklahoma, Kansas border up here. I'm gonna left click and drag on that and then zoom in using the scroll wheel. So now I've got this storm long distance from the radar at 23:38. I'm gonna drag it and move it over there, and we're gonna use the left arrow keys to step backward in time to 23:06. Give you a second to catch up to this. 

Meanwhile we'll look at this segment in here. If I hit the dot key on the keypad to see what velocity looks like, we see that there's some cyclonic shear in here in this middle cell in this line segment, if we look at the upper left panel. And if we look at the base velocity on the upper right then those velocities, if I go ahead and zoom in and I have my mouse settings set so that if I just double click and hold and I can roam around this display. The long left click set to a sampling. Got 75 knot outbound velocities on one side. So there's cyclonic shear there. But if you notice, it's really dominated by the outbound velocities with this velocity display. You can see a couple in there, but it really doesn't pop out much. A little bit better on the SRM with a 289 at 14 storm motion. But your storm motion will be different than mine because that was what was entered the last time this motion was entered in the custom store motion. 

So let's go ahead and under the Tools menu, we're gonna load the radar display controls. Alright, when that comes up, we can see that the custom storm motion being used is 289 degrees at 14 knots. And I'm going to drag this over a little bit, so I can see this a little bit better. Alright, so let's say we want to update the storm motion and I have done some analysis outside of this and the motion should be more like 270 at 34 for this cell that's it's kind of gusting out, moving eastward. So, I'm gonna dial my direction down and I can just hold down this to go to 270 degrees and 34 knots. So let's look at what that did to the velocity display. I zoom in on that, we see that in the upper right again you really, your eye is distracted by is very strong outbound velocities in the base velocities. But what the effect of that motion estimate did was to increase the inbound velocities and enhance that peak. So it kind of pops out a little bit more and if I toggle over to kind of reflectivity here again, we could just kind of see that pattern stand out a little bit more when you have the the peak inbound and the peak outbound velocities being more balanced. Now it just so happens that for a lot of storms with mesocyclones, if in inside the reference frame of the the storm motion, that if if you look at it from that perspective, those couplets are usually pretty balanced. It's when you have really strong translating velocities that it kind of changes the perception of the rotation signature on the radial velocity display. 

So all we're doing is we're entering a storm motion to bring out the appearance of those peak velocities just so our eyes can see it better. When we do a rotational velocity calculation across this, it doesn't matter what storm motion you estimate. The velocity difference and rotational velocity you calculate on base velocity and SRM will always be the same. Because that's a it's a rotationally invariant quantity. It's a Galilean invariant. And so it really doesn't depend on reference frame for the shear calculation. So this is just purely to make these signatures pop out a little bit better for mesocyclones when we're you know we know we're looking for mesos, so let's get the storm motion right so we can see these peak velocities on the inbounds and outbounds a bit better. 

There's a couple other storm motion techniques we can use. We can use one from the average storm ocean from STI from the STI product. And if we use that, we see that the inbound velocities actually show up a little bit more pronounced and that pattern kind of gets drawn out a little bit better than it does with base velocity. So it really doesn't matter that much which one you use, as long as those those peaks are drawing your attention to features that are important. Obviously most of the time want to use the actual storm motion, but it's just one of those things that's mainly for convenience of the human eye, kind of picking out these patterns. If we tried the storm motion from Warngen track, my motion track was 240 at 49. And it really brings out the inbound velocities almost too much, so this is probably not representative for this storm. But you can see there's again that storm motion from Warngen track that comes from the distance speed tool. It's the same one that's used from the Tools menu. So if you're doing Warngen, the last one that used the distance speed tool, it'll use that motion. If you've, if you're doing the distance speed tool from the tools menu, it'll also use that motion, that last one that you've you've set. So I'll go ahead and I will go back to my custom storm motion. Kind of leave it there for now. 

And we'll go on to another feature of the radar display controls, and that's the minimum feature strength. If we go ahead to the kcri menu, we go down here to the algorithm overlays, and go to DMD, the digital mesocyclone detection product. If we zoom out and look at all these circles that the DMD tracks and again it tracks all sorts of features from very weak ones to very strong ones. My minimum feature strength is set at 3. So if I want to see, if I want to filter out more of those circles, then maybe go to the basic definition of a mesocyclone with the DMD is usually more a strength rank of 5. And that's where that moderate rotation when you're getting around 30 knot rotational velocity. So it's starting to become more moderate rotation. It's right at the kind of the border there. I just want to look at strong, you know moderate to strong rotation, then if I do a filter out everything underneath the seven then I see I only have a few detections in my display. If I'm in the situation with like tropical rain bands and they're producing tornadoes with very weak rotational velocities, sometimes I might dial this down to something very small just to be able to pick out whatever shear is out there if it's a situation that doesn't have a lot of shear in the environment. Now this situation has tons of circulations everywhere and that's probably, that is definitely too much to to try and in view through. So it's all user adaptable, so the user gets to choose how much of the circles and how much tracking you want to, you want to display. So there's other radar display controls for some of the algorithms that we won't cover. They aren't used as much. But the main ones is custom storm motion and the DMD filter. The other thing is, I'll point out, the enable SAILS frame coordinator is checked on on the bottom here. that's important. Do not touch that, let that be. That's going to allow your extra SAILS tilts that are those 0.5 degree tilts that are the extra ones and the volume scan. If you have this selected, when you're on one of those extra sales tilts and you tilt upward and it's going to go to the next highest tilt in the volume scan. 

Let's go ahead and we can look for a display here. I'm gonna toggle off the DMD by left clicking on it. And we'll step through and we'll see. Here we are on a SAILS tilt 23:08. If we tilt upward with the enable SAILS frame coordinator checked, it's going to go to the 23:06 0.9 degree tilt. So, this way you're always kind of able to sample, you know, to step through a volume of radar data whether you're on the extra SAILS tilt or not. And this is the most intuitive way to view all tilts data. Just like gr2 analyst, so don't touch the SAILS frame coordinator button. Always leave it on. If you check it off and you're on that extra SAILS tilt, you try and go up it doesn't go anywhere. It's very unintuitive. It's easy to get lost. It's hard to navigate through volumes. And you just don't need that when you're looking at all tilts. So leave that checked and you're gonna be fine. And as long as you don't deselect it, then that should be the most intuitive. 

So that's a quick introduction to the radar display controls for the storm motion and the DMD filters. And don't touch the SAILS frame coordinator