Shear Markers

No, live radars don't do shear markers. He was talking about the WSI / VIPIR stuff that shows multiple shear scits for the same storm because they don't filter out, and/or they show tilt 2-4 shears.
 
rdale said:
No, live radars don't do shear markers. He was talking about the WSI / VIPIR stuff that shows multiple shear scits for the same storm because they don't filter out, and/or they show tilt 2-4 shears.
Click to expand...
That's news to me because I've seen local OKC stations have shear markers overlaid on their station's radar (and 88D stuff). So does that mean they are putting 88D detections on their radar images? :confused: I think I just confused myself beyond hope. :o
 
Yes - all the software allows for that... Lives can't because they don't do volume scans, so there's no way to interrogate a storm for rotation. All you could get was one level GtG and that certainly isn't a proxy for tornado.
 
So we don't really know what a shear marker's position indicates when zoomed in, as in center of rotation, point of max shear or boundary of sheared area? I didn't see this addressed at the GRL forum--if no one here knows, I'll post the question over there.
 
Dave - all depends on what you're talking about as all software is different... This post was in relation to the TV packages used from WSI / Baron / etc. GR's forum would have more info if you're referring to GRLevelX stuff.
 
I have noticed, when using MTN, that tornadoes only tend to occur when the "shear marker" gives a velocity (I'm assuming a GTG shear) of over 100mph, and often above 120mph. I have always believed the multiple markers situation arises from MTN showing markers from all radar sites, as it says in the handbook. From page 26:

"As a result of processing the data from all of the radars across the
country, multiple SCITs may be displayed in and around one storm.
This is because each radar with different operational conditions can
provide new and valuable information on the parameters of a particular​
storm cell."
 
Paul Knightley said:
I have noticed, when using MTN, that tornadoes only tend to occur when the "shear marker" gives a velocity (I'm assuming a GTG shear) of over 100mph, and often above 120mph. I have always believed the multiple markers situation arises from MTN showing markers from all radar sites, as it says in the handbook. From page 26:

"As a result of processing the data from all of the radars across the
country, multiple SCITs may be displayed in and around one storm.
This is because each radar with different operational conditions can
provide new and valuable information on the parameters of a particular​
storm cell."
Click to expand...

Paul this is the same thing I wrote before but probably I didn't express clearly: I've noticed too that when you see more than 100mph you have a good probability to see a tornado; I'm not referring to the value that you see when you click the shear marker, but I'm telling about the velocity.
 
Mike G. and Greg Stumpf replied to my question at the GRLX forum. Meso markers are placed "on the centroid of the shear region."

"The NMD centroids are defined as the halfway point of a line connecting the maximum inbound and the maximum outbound at the lowest elevation angle of detection."

Thanks to you both.
 
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