Alert archive / Illinois / Mesoscale Discussions in 2021
Mesoscale Discussion 2005
The Storm Prediction Center issued this mesoscale discussion at Dec 10, 2021, 11:28 PM CST for 4 states. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Dec 10, 2021, 11:28 PM CST (05:28 UTC)
- Expired
- Dec 11, 2021, 1:00 AM CST
- In force
- 92 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 557...559
All 48 counties
Alexander County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Clay County, IN, Daviess County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Sullivan County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Union County, KY, Bollinger County, MO, Cape Girardeau County, MO
The radar
The Evansville,IN radar (KVWX), 50 km from the middle of the area, began a volume at 05:29 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 00:00Z, 5.5 hours before the alert went out and 180 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
- 119 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 662 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 341 m²/s²
- 0-3 km storm-relative helicity
- 357 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
993
ACUS11 KWNS 110528
SWOMCD
SPC MCD 110528
INZ000-KYZ000-ILZ000-MOZ000-110700-
Mesoscale Discussion 2005
NWS Storm Prediction Center Norman OK
1128 PM CST Fri Dec 10 2021
Areas affected...far southeast Missouri into east-central Illinois
Concerning...Tornado Watch 557...559...
Valid 110528Z - 110700Z
The severe weather threat for Tornado Watch 557, 559 continues.
SUMMARY...The severe threat continues across Tornado Watches 557 and
559. Large hail and damaging gusts remain the main threats, though a
tornado or two is possible, especially with the storms approaching
eastern Illinois.
DISCUSSION...A line of semi-discrete storms (including supercells)
continues across western portions of Tornado Watches 557 and 559.
Despite several preceding storms earlier in the day, strong
low-level warm-air advection in advance of a 992 mb surface low has
maintained modest buoyancy ahead of the ongoing line of storms, with
mid to upper 60s F temperatures and mid 60s F dewpoints supporting
up to 1000 J/kg MLCAPE and minimal convective inhibition. As such,
large hail and damaging gusts may accompany the stronger storms over
the next few hours. Despite veering low-level winds, strong speed
shear is contributing to 300+ m2/s2 effective SRH, so a tornado or
two also remains possible.
..Squitieri/Grams.. 12/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...IND...PAH...ILX...LSX...
LAT...LON 37309005 38548920 39218866 39938799 40168732 40048696
39628666 38888681 38218735 37728767 37388813 37108902
37309005SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 7:02 PM CST | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Macoupin, Madison, Monroe and 4 more | 58 min |
| Dec 10, 7:18 PM CST | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 18 more | 87 min |
| Dec 10, 7:47 PM CST | Tornado Watch | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 21 more | 8 hr |
| Dec 10, 8:53 PM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Coles and 21 more | 97 min |
| Dec 10, 9:36 PM CST | Mesoscale Discussion | SPC | Clark, Coles, Cumberland, Edgar, Effingham, Shelby | 54 min |
| Dec 10, 10:09 PM CST | Mesoscale Discussion | SPC | Massac | 96 min |
| Dec 10, 11:03 PM CST | Tornado Watch | SPC | Alexander, Clinton, Edwards, Fayette, Franklin, Gallatin and 17 more | 5 hr |
| Dec 10, 6:21 PM CST | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 10 hr |
| Dec 10, 8:35 PM CST | Mesoscale Discussion | SPC | Harrison | 85 min |
| Dec 10, 10:25 PM CST | Mesoscale Discussion | SPC | Bartholomew, Benton, Blackford, Boone, Brown, Carroll and 50 more | 95 min |
| Dec 10, 11:08 PM CST | Mesoscale Discussion | SPC | Dearborn, Decatur, Delaware, Fayette, Franklin, Hamilton and 16 more | 67 min |
| Dec 10, 11:20 PM CST | Tornado Watch | SPC | Adams, Allen, Blackford, Carroll, Cass, Dearborn and 27 more | 6 hr |
| Dec 11, 1:46 AM CST | Mesoscale Discussion | SPC | Bartholomew, Brown, Daviess, Dearborn, Decatur, Delaware and 21 more | 59 min |
| Dec 10, 6:22 PM CST | Mesoscale Discussion | SPC | Fulton, Graves, Hickman | 53 min |
| Dec 10, 7:41 PM CST | Mesoscale Discussion | SPC | Fulton | 64 min |
| Dec 10, 8:48 PM CST | Mesoscale Discussion | SPC | Carlisle, Fulton, Graves, Hickman, Lyon, Marshall | 57 min |
| Dec 10, 9:48 PM CST | Mesoscale Discussion | SPC | Caldwell, Graves, Hopkins, Lyon, Marshall | 57 min |
| Dec 10, 10:44 PM CST | Mesoscale Discussion | SPC | Caldwell, Grayson, Hopkins, McLean, Muhlenberg, Ohio | 61 min |
| Dec 10, 11:36 PM CST | Mesoscale Discussion | SPC | Calloway, Christian, Logan, Simpson, Todd, Trigg | 54 min |
| Dec 10, 11:53 PM CST | Mesoscale Discussion | SPC | Breckinridge, Bullitt, Grayson, Hardin, Jefferson, Meade and 3 more | 67 min |
| Dec 11, 1:02 AM CST | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Bourbon and 51 more | 88 min |
| Dec 11, 1:05 AM CST | Mesoscale Discussion | SPC | Barren, Butler, Edmonson, Green, Hart, Logan and 2 more | 55 min |
| Dec 11, 1:27 AM CST | Tornado Watch | SPC | Adair, Allen, Anderson, Barren, Bath, Bourbon and 51 more | 7 hr |
| Dec 11, 2:51 AM CST | Mesoscale Discussion | SPC | Boyle, Casey, Clark, Estill, Garrard, Jessamine and 4 more | 54 min |
| Dec 11, 5:32 AM CST | Mesoscale Discussion | SPC | Bell, Breathitt, Clark, Clay, Estill, Jackson and 18 more | 88 min |
| Dec 10, 7:54 PM CST | Mesoscale Discussion | SPC | Christian, Crawford, Dallas, Dent, Douglas, Greene and 10 more | 2 hr |
| Dec 10, 9:40 PM CST | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 2 hr |
Nearby
Mesoscale Discussions in Illinois, 2021Mesoscale Discussions in Indiana, 2021Mesoscale Discussions in Missouri, 2021Every mesoscale discussion in 2021
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.