Andrew Stoller
EF5
Well, the cap has finally broken in ne IA. Explosive supercell now with a hook and a TVS. Likely a very dangerous night for people in the upper MS valley.
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6/18/09: NOW IA
- Thread starter Andrew Stoller
- Start date
Andy Wehrle
EF5
What are we, a big cheesehead-shaped void east of Iowa and north of Illinois?
In all seriousness, very classic supercell in progress just to the north of Prairie du Chien, WI with a pronounced couplet. It's been turning gradually to the right since it initiated.
David Draun
EF5
Too bad IL is capped. The RUC mesoanalysis suggests an effective inflow layer significant tornado parameter of 11!! in Lee country, IL. Any storm that could form in that area would go bonkers in a hurry.
But ya gotta wonder: with all this untapped instability to the south, tomorrow could be a good day?
But ya gotta wonder: with all this untapped instability to the south, tomorrow could be a good day?
Stuart Robinson
EF5
post Removed by me - Prarie De Chien cell has NOT collasped at all !!!
VIL's have gone right back up in the last scan - Radar pronouced hook now visable.
VIL's have gone right back up in the last scan - Radar pronouced hook now visable.
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Andrew Stoller
EF5
It looks like that cell is going to ingest everything around it and turn into a MONSTER here shortly.
Jim Zandonai
Too late is right.. however strong supercell in SW WI moving east..with good inflow and rotation..looks like WI will be under the gun tonight..too bad this didnt happen in daylight.. ..doesnt look like much south of there still at this hour in IA..or even N.IL.
David Draun
EF5
I dunno, the entire area seems to be filling in with storms. The instability axis is farther south which leads me to believe that cold pools will form and the MCS will begin to surge southward. Any tornado threat would be confined to the south and western parts of this heavy convective mess that has materialized. At least its gotta be a good light show.
Wind threat should get going fairly soon.
Andrew Stoller
EF5
Yea, I agree David. Instability drops off further southeast as well.
Tyler Yarnell
EF1
couplet coming back in a hurry on the cell south of richland center
edit: cell west of Decorah in northeastern Iowa beginning hook echo and couplet is forming
cell south of richland center now tornado warned.
edit: cell west of Decorah in northeastern Iowa beginning hook echo and couplet is forming
cell south of richland center now tornado warned.
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Jacob Ferden
EF4
You just beat me to it. Decorah looks to be under the gun shortly. Looking better and better with each run.
John Farley
Supporter
Prarie du Chein supercell TOR-warned again in Iowa County (WI). I intercepted this cell between West Union and Decorah, IA just as the storm split and the right-mover became the supercell that produced the earlier TOR warning and this new one. The storm produced an interesting lowering to my northeast as it split, also about the time of the first severe hail report (1 inch) in Calmar, IA. Brief report coming soon.
Tyler Yarnell
EF1
yep, looks like a DRC is showing up on the Decorah cell. Other cells in wisconsin is most likely putting down a tornado, very strong, tight rotation. Heading right toward dodgeville, wi
David Draun
EF5
New MD out for current tornado watch. Storms should begin developing southward into IL and a SVR watch will be issued for the overnight hours. Still over 4000 J/kg of instability for this stuff to feed on.
Ben Faber
EF0
Live streams out of Madison:
http://www.wkowtv.com/Global/category.asp?C=164809&nav=menu1362_3
mms://a1864.l922920625.c9229.n.lm.akamaistream.net/D/1864/9229/v0001/reflector:20625
http://www.wkowtv.com/Global/category.asp?C=164809&nav=menu1362_3
mms://a1864.l922920625.c9229.n.lm.akamaistream.net/D/1864/9229/v0001/reflector:20625
Tyler Yarnell
EF1
Wow last scan has the cell south of Decorah blowing up. Developing hook, very nice couplet. Just east of postville, ia following a similar track of the first tornado warned cell.
