Alert archive / Indiana / Tornado Watches in 2021
Tornado Watch 557
The Storm Prediction Center issued this tornado watch at Dec 10, 2021, 7:47 PM CST for 27 counties in Illinois; 30 counties in Indiana. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 10, 2021, 7:47 PM CST (01:47 UTC)
- Expired
- Dec 11, 2021, 3:44 AM CST
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 70 kt
All 57 counties
Champaign County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Lawrence County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, McLean County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Richland County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Bartholomew County, IN, Benton County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Clinton County, IN, Daviess County, IN, Fountain County, IN, Greene County, IN, Hendricks County, IN, Jackson County, IN, Jasper County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN
The radar
The Lincoln radar (KILX), 116 km from the middle of the area, began a volume at 01:48 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 60%
- One or more EF2 to EF5 tornadoes
- 40%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
36 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 8:05 PM CST | Tornado Warning | ILX | Mason, Tazewell | 40 min |
| Dec 10, 8:28 PM CST | Tornado Warning | ILX | Logan, Mason, Tazewell | 32 min |
| Dec 10, 8:32 PM CST | Severe Thunderstorm Warning | ILX | Logan, Sangamon | 28 min |
| Dec 10, 8:38 PM CST | Tornado Warning | ILX | McLean, Woodford | 22 min |
| Dec 10, 8:38 PM CST | Severe Thunderstorm Warning | IND | Bartholomew, Brown, Johnson, Shelby | 25 min |
| Dec 10, 8:50 PM CST | Tornado Warning | ILX | McLean | 12 min |
| Dec 10, 8:58 PM CST | Severe Thunderstorm Warning | ILX | DeWitt, McLean, Macon, Moultrie, Piatt, Sangamon | 47 min |
| Dec 10, 9:09 PM CST | Severe Thunderstorm Warning | ILX | Christian, Macon, Moultrie, Piatt, Shelby | 66 min |
| Dec 10, 9:23 PM CST | Tornado Warning | ILX | Shelby | 36 min |
| Dec 10, 9:27 PM CST | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 48 min |
| Dec 10, 9:33 PM CST | Severe Thunderstorm Warning | ILX | Champaign, Piatt, Vermilion | 42 min |
| Dec 10, 9:46 PM CST | Severe Thunderstorm Warning | LOT | Kankakee, Will | 44 min |
| Dec 10, 9:51 PM CST | Severe Thunderstorm Warning | ILX | Champaign, Coles, Cumberland, Douglas, Moultrie, Piatt and 1 more | 54 min |
| Dec 10, 9:55 PM CST | Tornado Warning | ILX | Coles, Douglas, Moultrie | 19 min |
| Dec 10, 9:58 PM CST | Tornado Warning | ILX | Coles, Douglas, Moultrie | 32 min |
| Dec 10, 10:04 PM CST | Tornado Warning | LOT | Jasper, Porter | 26 min |
| Dec 10, 10:22 PM CST | Severe Thunderstorm Warning | LOT | Benton, Jasper, Newton | 38 min |
| Dec 10, 10:24 PM CST | Severe Thunderstorm Warning | ILX | Champaign, Clark, Coles, Douglas, Edgar, Vermilion | 35 min |
| Dec 10, 10:26 PM CST | Tornado Warning | ILX | Coles, Douglas, Edgar, Vermilion | 19 min |
| Dec 10, 10:32 PM CST | Severe Thunderstorm Warning | IND | Fountain, Vermillion, Warren | 28 min |
| Dec 10, 10:42 PM CST | Severe Thunderstorm Warning | IND | Daviess, Greene, Knox, Martin, Monroe, Owen | 33 min |
| Dec 10, 10:45 PM CST | Tornado Warning | IND | Fountain, Parke, Vermillion | 30 min |
| Dec 10, 10:55 PM CST | Severe Thunderstorm Warning | IND | Daviess, Greene, Knox, Sullivan | 35 min |
| Dec 10, 10:55 PM CST | Severe Thunderstorm Warning | IND | Fountain, Montgomery, Parke, Tippecanoe, Vermillion, Vigo and 1 more | 35 min |
| Dec 10, 10:56 PM CST | Severe Thunderstorm Warning | ILX | Coles, Cumberland, Effingham, Jasper, Moultrie, Shelby | 49 min |
| Dec 10, 11:10 PM CST | Tornado Warning | IND | Daviess, Greene, Knox, Sullivan | 22 min |
| Dec 10, 11:16 PM CST | Severe Thunderstorm Warning | IND | Carroll, Clinton, Montgomery, Parke, Putnam, Tippecanoe | 29 min |
| Dec 10, 11:36 PM CST | Severe Thunderstorm Warning | IND | Boone, Carroll, Clinton, Hamilton, Howard, Montgomery and 1 more | 24 min |
| Dec 10, 11:40 PM CST | Severe Thunderstorm Warning | ILX | Clark, Coles, Crawford, Cumberland, Edgar, Effingham and 2 more | 65 min |
| Dec 10, 11:58 PM CST | Severe Thunderstorm Warning | IND | Boone, Clinton, Hamilton, Hendricks, Howard, Madison and 4 more | 32 min |
| Dec 11, 12:05 AM CST | Severe Thunderstorm Warning | IND | Parke, Vermillion, Vigo | 25 min |
| Dec 11, 12:28 AM CST | Severe Thunderstorm Warning | IND | Clay, Parke, Putnam, Vigo | 32 min |
| Dec 11, 12:49 AM CST | Severe Thunderstorm Warning | IND | Hendricks, Putnam | 26 min |
| Dec 11, 12:59 AM CST | Severe Thunderstorm Warning | IND | Hendricks, Putnam | 21 min |
| Dec 11, 1:15 AM CST | Severe Thunderstorm Warning | IND | Hamilton, Marion | 30 min |
| Dec 11, 1:56 AM CST | Severe Thunderstorm Warning | IND | Bartholomew, Brown, Johnson, Monroe, Morgan, Shelby | 34 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
- Mesoscale Discussion 1990 Severe potential...watch likely
- Mesoscale Discussion 1996 Tornado watch 552...553...557
- Mesoscale Discussion 1997 Tornado watch 557
- Mesoscale Discussion 2002 Tornado watch 557
- Mesoscale Discussion 2004 Severe potential...watch likely
- Mesoscale Discussion 2005 Tornado watch 557...559
- Mesoscale Discussion 2012 Tornado watch 557...560
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.8 hours before the alert went out and 54 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.
300
WWUS20 KWNS 110144
SEL7
SPC WW 110144
ILZ000-INZ000-110800-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 557
NWS Storm Prediction Center Norman OK
745 PM CST Fri Dec 10 2021
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Central and eastern Illinois
Western to southern Indiana
* Effective this Friday night and Saturday morning from 745 PM
until 200 AM CST.
* Primary threats include...
A few tornadoes likely with a couple intense tornadoes possible
Scattered damaging winds likely with isolated significant gusts
to 80 mph possible
SUMMARY...A fast-moving linear cluster with embedded supercells will
spread east from western Illinois into Indiana tonight.
The tornado watch area is approximately along and 60 statute miles
east and west of a line from 45 miles northeast of Peoria IL to 40
miles south southwest of Bloomington IN. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 552...WW 553...WW
554...WW 555...WW 556...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 400. Mean
storm motion vector 24045.
...GramsSPC 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, 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, 11:28 PM CST | Mesoscale Discussion | SPC | Alexander, Clark, Clay, Coles, Crawford, Cumberland and 24 more | 92 min |
| 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 |
Nearby
Tornado Watches in Indiana, 2021Tornado Watches in Illinois, 2021Every tornado watch 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.