10/29/09 Disc: LA/AR

[jshields]

storm surveys are out for the tornado that went through downtown shreveport. they don't have any pics up, but it sounds like alot of damage!

http://forecast.weather.gov/product.php?site=SHV&product=PNS&issuedby=SHV

also other survey for a tornado earlier in the day in LA that crossed I-20

http://forecast.weather.gov/product.php?site=SHV&issuedby=SHV&product=PNS&format=CI&version=2&glossary=0

 

[Rob Sermon]

Now that roads are open, I'll post pics with lat and long. The only exception will be Green Acres Place. As I don't live there, the police ain't about to let me in.

 

[Chad Cowan]

Posting here to get some input from others as to what this feature might be. Any ideas? Video here: http://www.chasethestorms.com/102909 (I was fighting to turn off the autofocus so the first part is a bit shaky. That's what happens when you don't use your camera for three months!).

I don't know what to think of it but given the environment it warrants a closer look. 0-1km SRH was over 600 m2/s2 at the time! I'm thinking the 25kt se'rly wind ramping up that mountain helped out with the lift, and compensated for the marginal thermodynamics.

1943z sfc map, with 75F isotherm:

 

[Skip Talbot]

Very interesting shot, Chad. I wish we could say for certain if this feature is tornadic, but its difficult to say just looking at the picture and the video. I did run a contrast enhance on the image to see if the feature is ahead of or behind the hill, and it looks like its behind, although I can't say for certain. What I did notice is that there appears to be a hole in it, just above the powerline in the middle. This leads me to believe its probably a ragged part of the base or rising scud:

This would be a great shot for a spotter class if we could definitively identify it.

 

[Joshua Nall]

Here's an updated summary on the tornadoes in the Arklatex. 16 total, with 3 tornadoes touching down in Magnolia, AR. The first two produced by the same storm back to back and then the 3rd one about an hour later. I was fortunate enough to witness the 2nd one. All 3 rated EF1. The most significant tornado touched down in Shreveport, LA rated EF2 and was on the ground for 13 miles.

http://www.srh.noaa.gov/shv/?n=october27-292009floodingandtornadoes

 

[Chad Cowan]

Very interesting shot, Chad. I wish we could say for certain if this feature is tornadic, but its difficult to say just looking at the picture and the video. I did run a contrast enhance on the image to see if the feature is ahead of or behind the hill, and it looks like its behind, although I can't say for certain. What I did notice is that there appears to be a hole in it, just above the powerline in the middle. This leads me to believe its probably a ragged part of the base or rising scud:

This would be a great shot for a spotter class if we could definitively identify it.

I noticed that white spot too and I did think it was a hole at first but after playing with brightness and contrast in my video editor I've come to the conclusion that it is a small cloud on the near side of that feature and not a hole through it. If you look at the video at 0:14 you can see this cloud more clearly.

Definitely a noodle scratcher.

 

[John Robinson]

Chad,

I think you have a tornado there. The Logan County emergency manager called us this past Friday or Saturday about a possible tornado on the Scott/Logan County line, with the damage having occurred on Thursday afternoon, October 29th.

Due to spending so much time with the damage in South Arkansas, we couldn't get over to western Arkansas to do a survey until this past Tuesday.

A resident, who had some damage on his property, drove us around, and we also talked to two U.S. Forest Service employees, and some residents who lived near the start of the track.

The track began not too far north of Arkansas 248 in Scott County, passed near the Grayson community and the Knoppers Ford Rec. Area, then ended in the Jacks Creek area in southern Logan County. We were told by the USFS employees that the FS had flown the track, and that it matched with our ground survey. Since most of this land is in the national forest, there was not much in the way of structural damage.

The PNS with the survey results is here:
http://www.srh.noaa.gov/lzk/?n=pns110309txt.htm

Oops...Should have been posted in the DISC:LA thread, not here. Mods please move and add AR to LA.