A couple of 5/31/2013 maps

Tim Vasquez

Tim Vasquez

EF5
Joined
Dec 4, 2003
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I composed these maps Saturday. I caution that these are DRAFTS since my time was cut short due to previous travel plans to San Antonio and I haven't yet really explored the fine scale structures in the storm. The maps are based entirely on circulations as interpreted from the KCRI and KTLX radar imagery, and aren't refined with any ground survey data. For the text blocks I chose to use ground relative radial velocities.

High winds (along either KCRI or KTLX radial) and significant circulations.

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Outflow outer leading edge isochrones as interpreted from KCRI and KTLX spectrum width and reflectivity. Circle diameters intersect max +/- radial velocity, so are proportional to circulation size and does not indicate whether it is a tornado or not.

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There you can see slowing as the storm goes through two later tornadic phases: one in S OKC and the other in east Norman.

Tim
 
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Does anyone have images of the 1kmEHI, 1km Storm Relative Helicity, Significat Tornado Parameter, Supercell Composit and the Norman sounding for Friday evening? I did not have time to look at these products during the chase and I would be curious as to what this products looked like that night.
 
OUN 00z Sounding. Note that PW is at 1.66.


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With respect to the mesonet data, I recall a few key points. Dewpoints in the part of the state between 35 and front/dryline were in the mid 70s and also had the most backed winds. The winds ahead of the cell in El Reno at one point I recall were turning almost easterly. With that being right along the boundary, it is hard to say without a closer look whether that was the storm enviroment causing this or the boundary was slipping that far south. One of the MPEX soundings taken a bit before the storms fired had 90/77 in the Chickasha, which also corresponded with a 75 dewpoint at the mesonet there.
 
Here's a link to a zip file containing the south sector SPC mesoanalysis parameters for May 31st 17z to 3z (Jun 1): http://sdrv.ms/18XDWfp

It's my first time using Skydrive to share anything, so let me know if it doesn't work

FYI: If there's a 0kb file in any of the folders, it's because it wasn't there on SPC, my script just had a list of everything to download, so it created a file whether or not it actually got one :)
 
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Nick Nolte said:
It's my first time using Skydrive to share anything, so let me know if it doesn't work
Click to expand...

Just as a sidebar; I have to compliment MS on Skydrive. It definitely makes my life easier on business trips. I never paid much attention to the benefits of cloud computing, but I am hooked now.

Thanks for the maps.
 
Does anyone have saved images from GrLv3 or similar from the El Reno tornado that shows radar and spotter positions with names. I'd like to see where I was in relationship to the tornado and my friends. I am especially looking around 6:05 to 6:20 PM CDT time period. Bill Hark
 
Hi Bill, I'm not sure if this is exactly what you're looking for since I don't have spotter position info, but maybe this will be of use.

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This is from the KCRI research radar in Norman, which is a little closer than TLX. I chose the 0.9 deg tilt here since I find that it tends to be a bit cleaner for storms within 30 nm, at least with TLX. This storm was heavily aliased due to the extreme velocities, but it was less of a problem at 0.9 compared to 0.5.
 
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