07-13-04 Tornadoes Rated: IL & WI, Roanoke IL F3 so far

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
810 PM CDT WED JUL 14 2004

...INITIAL SURVEY RESULTS OF ROANOKE TORNADO ON JULY 13...

...DAMAGE POTENTIALLY GREATER THAN F3 -- FURTHER SURVEYS TO BE
CONDUCTED ON THURSDAY...

http://kamala.cod.edu/offs/KILX/0407150110.nous43.html

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
525 PM CDT TUE JUL 13 2004

...RESULTS OF THE NATIONAL WEATHER SERVICE STORM DAMAGE SURVEY FOR
BUREAU COUNTY IN NORTHWEST ILLINOIS...
http://kamala.cod.edu/offs/KDVN/0407132230.abus34.html

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
605 PM CDT WED JUL 14 2004

...RESULTS OF STORM DAMAGE SURVEY IN MANITOWOC COUNTY...
http://kamala.cod.edu/offs/KGRB/0407142303.abus34.html

Some additional links on the Roanoke storm:

http://www.pantagraph.com/
http://www.pjstar.com/
http://week.com/Default.asp
http://www.hoinews.com/
http://www.wmbd.com/news.asp
http://www.crh.noaa.gov/ilx/events/jul132004/jul13.php

Mike
http://mgweather.com
 
It was amazing footage. My only regret is that I couldn't drive (broken right foot) because the storms were about two hours away from Elgin and I could have gone down there and chased them :evil: :(
 
It was amazing footage. My only regret is that I couldn't drive (broken right foot) because the storms were about two hours away from Elgin and I could have gone down there and chased them :evil: :(

I feel your pain, (well not literally lol).
I sat here like an idiot and watched the supercell pass aboout 75 miles to my east, beautiful overshooting top. I kept thinking something would fire off to the west closer to my area where the cape was near 7,000!! The towers in my area were rather healthy, but they just couldn't break that strong 700mb cap. At one point the temperature was 92, with a 79Td making the heat index 108.

I'm just very glad no one was severely injured or killed from this tornado!
 
It was amazing footage. My only regret is that I couldn't drive (broken right foot) because the storms were about two hours away from Elgin and I could have gone down there and chased them :evil: :(

I feel your pain, (well not literally lol).
I sat here like an idiot and watched the supercell pass aboout 75 miles to my east, beautiful overshooting top. I kept thinking something would fire off to the west closer to my area where the cape was near 7,000!! The towers in my area were rather healthy, but they just couldn't break that strong 700mb cap. At one point the temperature was 92, with a 79Td making the heat index 108.

I'm just very glad no one was severely injured or killed from this tornado!

It was actually those supercells that saved northern IL/IN/OH from a pretty intense derecho. The subsidence behind the supercells supressed any further convection across northern IL, even with good instability/shear...
Kind of ironic...
 
Here's a quote from the Northern Illinois University's meteorology website....




"By the way, I have been
informed that a National Weather Service senior storm analyst from
Washington DC is heading for Roanoke, IL. That tornado on Tuesday,
produced by this frontal system, may be an F4 or F5 intensity tornado on
the Fujita damage scale (winds of 260 MPH or higher). Two homes were
scoured away in Roanoke. He will be on site this afternoon to do a
detailed analysis. If this is an F4 or higher...it will be the first
since the May 9, 1995 Cantrall, IL tornado, which was rated F4."

:shock:
 
An F4-F5 rating is definitely possible. The two home that got destroyed were blown completely apart and off their foundations. That has been indicative of 260+mph before. That plant got completely to'up from the flo'up. It looks at least F3-F4. If it is F5, that would be the first one in IL since Aug 28, 1990. Good tornado, high contrast stovepipe to almost a wedge. I'm glad nobody was hurt.
 
It was amazing footage. My only regret is that I couldn't drive (broken right foot) because the storms were about two hours away from Elgin and I could have gone down there and chased them :evil: :(

I wouldn't of headed down there unless I had some chase equipment like all these professionals. That supercell's outflow managed to fire off numerous other storms. Could of really been dangerous. The shield of mammatus clouds was just amazing. :D
 
"It was actually those supercells that saved northern IL/IN/OH from a pretty intense derecho. The subsidence behind the supercells supressed any further convection across northern IL, even with good instability/shear... "

How did that prevent the stuff in WI many hours later from forming to begin with? Why did the storms in MI moves east instead of southeast?

- Rob
 
How did that prevent the stuff in WI many hours later from forming to begin with? Why did the storms in MI moves east instead of southeast?

- Rob

My guess is that the air was still "sinking" across that region... Storms in WI did actually develop, but they never reached into the northern IL region (where the subsidence was).
My guess as to the storm motion would have to be the way the 500mb trough was moving, as well as the 1000-500mb thickness, and mid level winds... These components are all easterly here in MI, whereas across southern IL, they are more southerly (and when looped, the convection does follow the heights/thickness/wind).

The lack of development in northern IL may have saved IN/OH from an already initiated line of convection moving through (that that other individual storms/lines couldn't form).

Here is an image with the 1km satellite with various parameters overlayed:
[Broken External Image]:http://www.waveformpc.com/subsidence2.gif

BTW Rob... The new static IP is slated for Tuesday... I don't have much experience in "allow lines" using the LDM, so I may need to run through the man pages (send me a PM with any suggestions on this)...
 
Wish there was some sort of upper-air ob in that area! I didn't have a chance to save the data and review due to work issues...

- Rob
 
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