Alert archive / Illinois / Mesoscale Discussions in 2006
Mesoscale Discussion 2012
The Storm Prediction Center issued this mesoscale discussion at Sep 22, 2006, 5:37 PM CDT for 30 counties in Illinois; Lake County, Newton County, Indiana. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Sep 22, 2006, 5:37 PM CDT (22:37 UTC)
- Expired
- Sep 22, 2006, 7:30 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 32 counties
Boone County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, McLean County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Lake County, IN, Newton County, IN
The radar
The Chicago radar (KLOT), 44 km from the middle of the area, began a volume at 22:40 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.6 hours before the alert went out and 138 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 831 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 571 m²/s²
- 0-3 km storm-relative helicity
- 612 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 222237 SWOMCD SPC MCD 222237 INZ000-ILZ000-WIZ000-230030- MESOSCALE DISCUSSION 2012 NWS STORM PREDICTION CENTER NORMAN OK 0537 PM CDT FRI SEP 22 2006 AREAS AFFECTED...NRN IL...NWRN IND AND SWRN MI CONCERNING...TORNADO WATCH 791... VALID 222237Z - 230030Z CLUSTER OF SUPERCELLS WILL CONTINUE TO MOVE EWD ACROSS NRN IL...WITH THE MOST ORGANIZED TORNADO THREAT ANTICIPATED OVER THE CHI METRO AREA THROUGH 00Z. ELEVATED SVR HAIL THREAT MAY DEVELOP NEWD INTO SWRN MI AND NWRN IND OVER THE NEXT SEVERAL HRS...BUT A NEW WW IS NOT ANTICIPATED FOR THOSE AREAS ATTM. SURFACE ANALYSIS AND RADAR IMAGERY FROM CHICAGO INDICATES A E-W ORIENTED BOUNDARY EXTENDING FROM NEAR ORD EWD TO JUST NORTH OF ARR. THREE SEPARATE SUPERCELLS WILL MOVE ALONG AND JUST NORTH OF THIS BOUNDARY. RECENT LOT VWP DATA SHOWED A STRONGLY CURVED LOW LEVEL HODOGRAPH WITH O-1 KM SRH AROUND 350 M2/S2. THREAT FOR TORNADOES...POSSIBLY SIGNIFICANT...WILL OCCUR WITH THESE SUPERCELLS AS THEY MOVE EWD ALONG AND INTERACT WITH THE AFOREMENTIONED BOUNDARY. FARTHER SOUTH MORE DISORGANIZED BROKEN LINE OF SUPERCELLS SHOULD CONTINUE TO MOVE EWD AROUND 30 KTS IN THE PONTIAC AND BLOOMINGTON AREAS. IN ADDITION TO ISOLATED TORNADO POTENTIAL IN THIS AREA...STRONG MID LEVEL WINDS /STRAIGHT LINE HODOGRAPH/ WILL FAVOR ISOLATED LEFT MOVING SUPERCELLS WITH THE THREAT FOR LARGE HAIL. STRENGTHENING SWLY LOW LEVEL JET WILL AID IN INCREASING ELEVATED INSTABILITY INTO NWRN IND AND SWRN MI OVER THE NEXT FEW HRS. THIS MAY SUPPORT A MARGINAL ELEVATED SVR HAIL THREAT WITH ANY DEVELOPING TSTMS OVER THE AREA AND/OR NRN IL SVR STORMS THAT MOVE INTO THE AREA IN THE NEXT SEVERAL HRS. ..CROSBIE.. 09/22/2006 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...IND...LOT...ILX...MKX...DVN... 42508756 42528922 41859015 40219068 40268979 40278832 40298738 41028738 42448724
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 12:49 PM CDT | Mesoscale Discussion | SPC | Adams, Alexander, Bond, Brown, Calhoun, Cass and 38 more | 2 hr |
| Sep 22, 1:16 PM CDT | Tornado Watch | SPC | Adams, Alexander, Bond, Brown, Calhoun, Cass and 42 more | 8 hr |
| Sep 22, 2:20 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 30 more | 2 hr |
| Sep 22, 2:55 PM CDT | Mesoscale Discussion | SPC | Gallatin, Hamilton, Hardin, Johnson, Massac, Pope and 2 more | 2 hr |
| Sep 22, 3:00 PM CDT | Mesoscale Discussion | SPC | Adams, Alexander, Bond, Brown, Calhoun, Cass and 45 more | 90 min |
| Sep 22, 3:32 PM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more | 6 hr |
| Sep 22, 3:37 PM CDT | Tornado Watch | SPC | Edwards, Gallatin, Hamilton, Hardin, Massac, Pope and 4 more | 8 hr |
| Sep 22, 5:08 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Brown, Calhoun, Cass, Christian and 44 more | 2 hr |
| Sep 22, 3:34 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Boone, Brown, Clark, Clinton, Crawford and 35 more | 116 min |
Nearby
Mesoscale Discussions in Illinois, 2006Mesoscale Discussions in Indiana, 2006Every mesoscale discussion in 2006
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.