8/24/04 NOW: Midwest

rdale

EF5
Where'd that storm come from?!? Cell west of Chicago showing nice rotation and good hook as it moves northeast...

-
Unfortunately NWS Chicago has not figured out this whole "88D" thingy and has stopped producing some of the radar products while switching into VCP12...
 
Now a TOR with it! I don't see anything in the form of a boundary that would trip me to issue one on such a weakly rotating storm though. Nothing on sat or METAR's that says it'd drop a tube and shear is minimal (30kts at 30 miles away, 2300ft.)
 
Maybe it's pulsing severe in a locally-backed environment ... you'll have to watch it, I can't imagine it holding out for long - but who knows this year ... maybe it will turn right and head straight for Chicago for all any of us know. :)

CU fields in central - northeast Kansas are still holding my interest ... wishing for this cap to break soon and for a rogue supe to fire north of the boundary!
 
Very unexpected. I'm looking at the velocity and I am amazed on how beautifully this thing has developed.

This area isn't even in a slight risk!

It's still been maintaining it's very beautiful hook. It will be moving into Kane County in about 5-10 minuites or so.
 
"This area isn't even in a slight risk!"

It's in the 5% line for severe... Seems to be losing what definition it had over the past scan or two - winds in the cell area are SE around 3-7kts, with 10kts from the south behind the cell.

Nothing else in the area - everything "big" is down the IN/IL line.

- Rob
 
The tornado-warned cell in Chicago appears to be weakening as of the last scan.

Golfball hail has been reported with this storm in DeKalb county about ten minuites ago.

AT 545 PM CDT LOCAL LAW ENFORCEMENT REPORTED A FUNNEL CLOUD ON ROUTE 23 MILE AND HALF MILE SOUTH OF DEKALB ILLINOIS.
 
remember DTX this morning talked about possible tornados in the high helicities near the warm front, but thought they wouldn't happen due to lack of any jet. I assume that is what's happening near chi. Also along the warm front and or backed winds from other storm outflow, lk breeze, etc.

From anyone intrested, this is a good site for the radar modes, link is to chi.
http://weather.cod.edu/analysis/paulradar.pl?LOT
 
The warm front is in northern MI / WI so that couldn't be the culprit... 6min profiler loops show nice winds coming in through western IL (30kts in low levels from WSW) with southerly winds across IN / eastern IL.
 
Strange... That puts it on the northern split cell, not the "core storm" and the nothern cell showed no signs of rotation at all...

Actually - even stranger after plotting the lat/long on radar imagery, the northern storm was already 5 miles east of that location!
 
really, i didn't think the front was already in wis. hmmm.........

Maybe it will be a little intresting in the southern lower after all. Hopefully the LLJ can get cranking for at least decent rainfall overnight, we need it pretty bad.
 
TORNADO WARNING FOR...
NORTHERN KANE COUNTY IN NORTHEAST ILLINOIS
SOUTH AND SOUTHEAST MCHENRY COUNTY IN NORTHEAST ILLINOIS

* UNTIL 700 PM CDT

* AT 617 PM CDT...THE PUBLIC REPORTED A TORNADO AND RADAR INDICATED
ROTATION IN A THUNDERSTORM TWO AN HALF MILES NORTHWEST OF
BURLINGTON ILLINOIS.
Source:
http://kamala.cod.edu/svr/0408242324.KLOT.wfus53.html

Kane County is highly populated with over 400,000 people
and Mc Henry County has over 260,000 people.

Mike
 
THE OTHER THUNDERSTORM IS 5 MILES SOUTHEAST
OF BURLINGTON ILLINOIS. THIS THUNDERSTORM IS PRODUCING A TORNADO
AT 620 PM CDT.

Two rotating storms, and more storms trying to pop se of them.
 
STWs now bring issured for these cells:

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
WESTERN AND NORTHWESTERN LAKE COUNTY IN NORTHEAST ILLINOIS...
EASTERN HALF OF MCHENRY COUNTY IN NORTHEAST ILLINOIS
 
Looks like a cell is starting to go up just west of Manhattan KS - conveniently just after sunset. Grrr.... guess my CI timing was a bit off. 00Z TOP sounding shows very impressive instability - and that is north of the boundary - with >6600 J/Kg. You don't see that kind of CAPE observed very often in the UA network.

http://www.rap.ucar.edu/weather/upper/top.gif

Might still get a after dark torn for the next hour or so before the area starts filling in as the 850 jet crossing the boundary kicks into high gear. Early cell looks to already be developing weak mid-level rotation.

Glen
 
Looks like a cell is starting to go up just west of Manhattan KS - conveniently just after sunset. Grrr.... guess my CI timing was a bit off. 00Z TOP sounding shows very impressive instability - and that is north of the boundary - with >6600 J/Kg. You don't see that kind of CAPE observed very often in the UA network.

http://www.rap.ucar.edu/weather/upper/top.gif

Might still get a after dark torn for the next hour or so before the area starts filling in as the 850 jet crossing the boundary kicks into high gear. Early cell looks to already be developing weak mid-level rotation.

Glen

Hmm... According to the SkewT from COD, the TOP sounding only has 3290 J/KG CAPE... Looking at the parcel trajectory, I'd believe 3300 vs. 6600. --> http://weather.cod.edu/wx/public/raob/topskewt.GIF ... I think there was an error in the CAPE calculation by UCAR/NCAR/RAP...

EDIT: Sounding decoding from University of Wyoming also shows ~3300 J/KG SBCAPE from the TOP sounding (3394 J/KG to be exact) ---> http://weather.uwyo.edu/cgi-bin/sounding?r...2500&STNM=72456
 
That's kinda weird - agree must be some sort of software bug, back of the envelope calc agrees closer with the non-RAP calculations - but comparing other sites I don't see such large differences - so maybe it is a QA related bug. Sorry for the over hype - RAP is usually pretty reliable - didn't look the closely (obviously).

Glen
 
The air has really become saturated again tonight. I had decided to hold off on heading west because the timing was so up in the air - very glad I did now. I have to be up in the middle of the night for overnight video tonight anyway, so at least now I'll hopefully get some good lightning again. Last time I had to do this during a severe situation was with the tornado warning in the middle of the night in KC ... pretty doubtful that I'll see that kind of excitement this time. Not a big fan of tor-warnings in the middle of the night here. I notice that tornadoes are still given an honorable mention in the WW issued, though.

Meanwhile cells near Manhattan are showing signs of strengthening. Additional storms may fire shortly in NE Kansas as well. Looking forward to another busy night! Hopefully things can get going a bit earlier tomorrow.
 
THE NATIONAL WEATHER SERVICE IN TOPEKA HAS ISSUED A


* TORNADO WARNING FOR...
WEST CENTRAL POTTAWATOMIE COUNTY IN NORTHEAST KANSAS
EAST CENTRAL RILEY COUNTY IN NORTHEAST KANSAS


* UNTIL 1045 PM CDT


Very beautiful Supercell you got over there. Very strong rotation to it also and it's holding together nicely.
 
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