09L: Hurricane Ike

Patrick Martin said:
Ah...thank you. Old habits of looking at the lowest degree of tilt are not broken so easily. Looking at the higher tilt, the eye looks very consistent. Thanks for setting me straight.
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No problem..with regards to velocity too use the level 3 product..The level 2 it seems is sometimes harder to interpret as you have to dealias it etc..theres artifacts and its like data you have to further process for lack of a better word. Velocity data can be difficult to interpret even in regular thunderstorms sometimes..
 
Jeff Snyder said:
Those markers are just beyond the edge of the first pulse that's used to retrieve radial velocity (at this VCP, there are at least two scans as each of the low-level elevation angles). Note how the quality of the radial velocity data decrease rapidly and abruptly >90 mi away from the radar. All of this is to say that you really shouldn't trust the shear markers beyond 90 miles in this situation. Perhaps Jim can explain it a bit better (since he's more familiar with the VCPs) and the 88D scanning strategies.
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Sure, a good site to look at is our fundamentals of Doppler radar page. More specifically, we talk about the Doppler Dilemma here. If there's an echo beyond the maximum unambiguous range for velocity (the first ring of purple haze), the radar's gonna think it returned after the most recent pulse, not the pulse before. The software attempts to guess whether or not the echo came from outside the range by comparing the echo intensity of the short pulse with that of a long pulse interval (longer unambiguous range). But in a big rain shield, that task becomes more difficult and so you see speckles of rejected velocity data. Adjacent velocity data may not be rejected but may not be accurate either and so you may see strange shear markers. It takes longer to explain this so check out the site.
 
SevereStudios is looking for more phone reports. We will take info from all chasers. Call 605-770-1624 to be part of the show.
 
12:42 AM CDT - I'm pretty sure a streaker ran behind Jorma Duran as he was reporting live at this precise moment. Did anyone else catch this? It was some dude.
 
rdale said:
Level II velocity is better - use software that dealiases and you'll be happier than NIDS.
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You're correct.. it is better but just takes some working with it but easy to get fooled if you arent familiar with dealiasing etc..
 
Steve Miller is reporting Eye Wall is in Galveston - Live Phone Report next on SS Storm Center Live Feed in five minutes. Going to discuss damage and storm surge. Surge is rising fast.
 
Level II velocity is better - use software that dealiases and you'll be happier than NIDS.
Click to expand...

The Level II high-res velocity is freaking gorgeous. I wish I was at work ... I only have GR3 at home. :(

Gerraldo just asked the pretty fox "b-met" if the wind was going to shift and she had no idea ... "ummm ... it will still be counterclockwise" ...
 
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