Alert archive / Arkansas / Tornado Watches in 2021

Tornado Watch 552

December 10, 20217 states

The Storm Prediction Center issued this tornado watch at Dec 10, 2021, 3:07 PM CST for 7 states. It was in force for 11 hr.

The area

The outline as issued.

The facts

Issued: Dec 10, 2021, 3:07 PM CST (21:07 UTC)
Expired: Dec 11, 2021, 2:00 AM CST
In force: 11 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 65 kt

All 139 counties

Arkansas County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Crawford County, MO, Dent County, MO, Dunklin County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Texas County, MO, Washington County, MO, Wayne County, MO, Coahoma County, MS, DeSoto County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Tate County, MS, Tunica County, MS, Carroll County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 120 km from the middle of the area, began a volume at 21:12 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: 90%
One or more EF2 to EF5 tornadoes: 70%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

123 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Dec 10, 5:28 PM CST	Tornado Warning	PAH	Calloway, Graves, Marshall	47 min
Dec 10, 5:51 PM CST	Tornado Warning	LZK	Jackson, Lawrence, White, Woodruff	39 min
Dec 10, 6:07 PM CST	Tornado Warning	MEG	Craighead, Poinsett	38 min
Dec 10, 6:21 PM CST	Tornado Warning	LZK	Jackson	24 min
Dec 10, 6:21 PM CST	Tornado Warning	SGF	Laclede, Pulaski, Texas, Wright	39 min
Dec 10, 6:39 PM CST	Tornado Warning	MEG	Craighead, Greene, Mississippi, Poinsett	51 min
Dec 10, 6:42 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	48 min
Dec 10, 6:45 PM CST	Severe Thunderstorm Warning	LZK	Faulkner, Lonoke, Perry, Pulaski, Saline, White	45 min
Dec 10, 6:49 PM CST	Severe Thunderstorm Warning	SGF	Dent, Phelps, Pulaski	56 min
Dec 10, 6:53 PM CST	Severe Thunderstorm Warning	LZK	Cleburne, Faulkner, Independence, White	52 min
Dec 10, 7:01 PM CST	Tornado Warning	LZK	Faulkner, Lonoke, Pulaski, White	29 min
Dec 10, 7:02 PM CST	Tornado Warning	LSX	Crawford, Franklin, Gasconade	43 min
Dec 10, 7:06 PM CST	Severe Thunderstorm Warning	LZK	Garland, Montgomery, Saline	27 min
Dec 10, 7:06 PM CST	Tornado Warning Tornado observedConsiderable damage threat	MEG	Craighead, Greene, Mississippi	39 min
Dec 10, 7:12 PM CST	Tornado Warning	PAH	Hopkins, McLean, Muhlenberg	48 min
Dec 10, 7:14 PM CST	Severe Thunderstorm Warning	SGF	Dent, Phelps, Texas	46 min
Dec 10, 7:19 PM CST	Tornado Warning	LZK	Cleburne, Independence, Jackson, White, Woodruff	26 min
Dec 10, 7:26 PM CST	Tornado Warning	LZK	Lonoke, Prairie, Pulaski, White	49 min
Dec 10, 7:28 PM CST	Tornado Warning EmergencyTornado observedConsiderable damage threat	MEG	Mississippi	47 min
Dec 10, 7:29 PM CST	Severe Thunderstorm Warning	LZK	Faulkner, Lonoke, Prairie, Pulaski, White	46 min
Dec 10, 7:29 PM CST	Severe Thunderstorm Warning	LZK	Garland, Perry, Pulaski, Saline	17 min
Dec 10, 7:35 PM CST	Tornado Warning Tornado observed	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren	40 min
Dec 10, 7:38 PM CST	Tornado Warning	LZK	Lonoke, Prairie, Pulaski, White	37 min
Dec 10, 7:44 PM CST	Severe Thunderstorm Warning	LZK	Lonoke, Prairie, Pulaski	46 min
Dec 10, 7:47 PM CST	Tornado Warning	LZK	Independence, Jackson, White	43 min
Dec 10, 7:49 PM CST	Severe Thunderstorm Warning	LZK	Clark, Dallas, Garland, Hot Spring, Montgomery, Pike	56 min
Dec 10, 7:49 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	26 min
Dec 10, 8:02 PM CST	Tornado Warning	LZK	Jackson, White, Woodruff	43 min
Dec 10, 8:04 PM CST	Tornado Warning EmergencyTornado observedCatastrophic damage threat	MEG	Pemiscot	41 min
Dec 10, 8:10 PM CST	Tornado Warning Tornado observedConsiderable damage threat	PAH	New Madrid	23 min
Dec 10, 8:12 PM CST	Flash Flood Warning	LZK	Faulkner, Garland, Lonoke, Perry, Pulaski, Saline and 2 more	3 hr
Dec 10, 8:14 PM CST	Severe Thunderstorm Warning	LZK	Lonoke, Prairie, Pulaski, White, Woodruff	46 min
Dec 10, 8:14 PM CST	Tornado Warning	MEG	Craighead, Greene	34 min
Dec 10, 8:19 PM CST	Tornado Warning	PAH	Christian, Hopkins, Muhlenberg	41 min
Dec 10, 8:20 PM CST	Tornado Warning	MEG	Cross, Poinsett	40 min
Dec 10, 8:24 PM CST	Tornado Warning	SGF	Douglas, Texas, Wright	18 min
Dec 10, 8:26 PM CST	Tornado Warning	PAH	Caldwell, Christian, Hopkins, Trigg	34 min
Dec 10, 8:28 PM CST	Tornado Warning Tornado observedConsiderable damage threat	MEG	Lake, Obion	30 min
Dec 10, 8:29 PM CST	Severe Thunderstorm Warning Considerable damage threat	LZK	Lonoke, Prairie, White, Woodruff	46 min
Dec 10, 8:29 PM CST	Tornado Warning Tornado observedConsiderable damage threat	PAH	Fulton, Hickman	61 min
Dec 10, 8:29 PM CST	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis, City of Saint Louis	30 min
Dec 10, 8:34 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	41 min
Dec 10, 8:39 PM CST	Severe Thunderstorm Warning	LZK	Jackson, Woodruff	37 min
Dec 10, 8:41 PM CST	Severe Thunderstorm Warning	SGF	Douglas, Howell, Texas, Wright	34 min
Dec 10, 8:43 PM CST	Severe Thunderstorm Warning	LZK	Clark, Dallas, Grant, Hot Spring, Saline	47 min
Dec 10, 8:45 PM CST	Severe Thunderstorm Warning	LZK	Clark, Pike	45 min
Dec 10, 8:48 PM CST	Tornado Warning	PAH	Christian, Hopkins, Muhlenberg	42 min
Dec 10, 8:53 PM CST	Severe Thunderstorm Warning	PAH	Butler, New Madrid, Scott, Stoddard	52 min
Dec 10, 8:57 PM CST	Tornado Warning	MEG	Craighead, Poinsett	48 min
Dec 10, 8:59 PM CST	Tornado Warning	MEG	Craighead, Crittenden, Cross, Poinsett	31 min
Dec 10, 9:05 PM CST	Tornado Warning Tornado observedConsiderable damage threat	PAH	Graves, Marshall	40 min
Dec 10, 9:07 PM CST	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren and 1 more	38 min
Dec 10, 9:10 PM CST	Severe Thunderstorm Warning	SGF	Dent, Shannon, Texas	35 min
Dec 10, 9:13 PM CST	Severe Thunderstorm Warning	LZK	Jackson, Woodruff	47 min
Dec 10, 9:18 PM CST	Tornado Warning	MEG	Craighead, Mississippi, Poinsett	42 min
Dec 10, 9:19 PM CST	Severe Thunderstorm Warning	LZK	Grant, Jefferson, Pulaski, Saline	41 min
Dec 10, 9:21 PM CST	Severe Thunderstorm Warning	PAH	Alexander, Johnson, Pulaski, Union	39 min
Dec 10, 9:24 PM CST	Tornado Warning	MEG	Craighead, Mississippi, Poinsett	51 min
Dec 10, 9:25 PM CST	Severe Thunderstorm Warning Considerable damage threat	MEG	Crittenden, Cross, Mississippi, Poinsett	50 min
Dec 10, 9:25 PM CST	Tornado Warning	PAH	McLean, Muhlenberg	20 min
Dec 10, 9:26 PM CST	Tornado Warning EmergencyTornado observedCatastrophic damage threat	PAH	Graves	9 min
Dec 10, 9:26 PM CST	Severe Thunderstorm Warning	PAH	Mississippi, New Madrid, Scott	49 min
Dec 10, 9:27 PM CST	Severe Thunderstorm Warning Considerable damage threat	LZK	Conway, Johnson, Logan, Pope, Van Buren, Yell	48 min
Dec 10, 9:37 PM CST	Severe Thunderstorm Warning	LZK	Clark, Dallas	40 min
Dec 10, 9:40 PM CST	Tornado Warning Tornado observedConsiderable damage threat	PAH	Graves, Livingston, Lyon, Marshall	50 min
Dec 10, 9:45 PM CST	Tornado Warning EmergencyTornado observedCatastrophic damage threat	PAH	Marshall	15 min
Dec 10, 9:49 PM CST	Severe Thunderstorm Warning	PAH	Johnson, Massac, Pope, Pulaski	41 min
Dec 10, 9:52 PM CST	Tornado Warning	MEG	Mississippi	38 min
Dec 10, 9:59 PM CST	Severe Thunderstorm Warning	SGF	Shannon	31 min
Dec 10, 10:00 PM CST	Severe Thunderstorm Warning	LSX	Iron, Reynolds	45 min
Dec 10, 10:01 PM CST	Tornado Warning	MEG	Mississippi	44 min
Dec 10, 10:02 PM CST	Severe Thunderstorm Warning	LZK	Cleburne, Conway, Searcy, Stone, Van Buren	25 min
Dec 10, 10:05 PM CST	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	25 min
Dec 10, 10:06 PM CST	Severe Thunderstorm Warning	LZK	Dallas, Grant, Hot Spring, Jefferson	42 min
Dec 10, 10:09 PM CST	Tornado Warning Tornado observedConsiderable damage threat	PAH	Caldwell, Christian, Hopkins, Lyon	51 min
Dec 10, 10:14 PM CST	Tornado Warning	LSX	Iron, Madison, Reynolds	46 min
Dec 10, 10:17 PM CST	Severe Thunderstorm Warning	LZK	Arkansas, Lonoke, Monroe, Prairie	31 min
Dec 10, 10:17 PM CST	Tornado Warning EmergencyTornado observedCatastrophic damage threat	PAH	Caldwell	13 min
Dec 10, 10:19 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair	41 min
Dec 10, 10:26 PM CST	Severe Thunderstorm Warning	LSX	Reynolds	20 min
Dec 10, 10:27 PM CST	Tornado Warning	MEG	Crockett, Dyer, Gibson, Obion, Weakley	48 min
Dec 10, 10:30 PM CST	Tornado Warning	PAH	Massac, Pope	45 min
Dec 10, 10:31 PM CST	Tornado Warning EmergencyTornado observedCatastrophic damage threat	PAH	Caldwell, Hopkins	29 min
Dec 10, 10:34 PM CST	Tornado Warning	MEG	Obion	27 min
Dec 10, 10:36 PM CST	Tornado Warning Tornado observedConsiderable damage threat	PAH	Hopkins, McLean, Muhlenberg	39 min
Dec 10, 10:44 PM CST	Tornado Warning EmergencyTornado observedCatastrophic damage threat	PAH	Hopkins, Muhlenberg	31 min
Dec 10, 10:46 PM CST	Severe Thunderstorm Warning	MEG	Lee, St. Francis	44 min
Dec 10, 10:47 PM CST	Tornado Warning	PAH	Bollinger, Cape Girardeau, Perry	21 min
Dec 10, 10:50 PM CST	Severe Thunderstorm Warning	PAH	Bollinger, Wayne	25 min
Dec 10, 10:51 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	39 min
Dec 10, 10:55 PM CST	Severe Thunderstorm Warning	LSX	Madison	18 min
Dec 10, 10:58 PM CST	Tornado Warning EmergencyTornado observedCatastrophic damage threat	PAH	McLean, Muhlenberg	17 min
Dec 10, 10:59 PM CST	Tornado Warning Tornado observedConsiderable damage threat	MEG	Henry, Weakley	46 min
Dec 10, 11:06 PM CST	Severe Thunderstorm Warning	PAH	Bollinger, Cape Girardeau, Perry	39 min
Dec 10, 11:10 PM CST	Tornado Warning	LSX	Clinton, Marion, Washington	50 min
Dec 10, 11:11 PM CST	Severe Thunderstorm Warning	PAH	Crittenden, Hopkins, Union, Webster	36 min
Dec 10, 11:17 PM CST	Tornado Warning	PAH	Webster	28 min
Dec 10, 11:19 PM CST	Severe Thunderstorm Warning	LZK	Cleveland, Dallas, Grant, Jefferson	27 min
Dec 10, 11:20 PM CST	Severe Thunderstorm Warning	MEG	Mississippi	15 min
Dec 10, 11:25 PM CST	Severe Thunderstorm Warning	MEG	Crittenden, Lee, St. Francis	9 min
Dec 10, 11:33 PM CST	Severe Thunderstorm Warning	PAH	Franklin, Jackson, Jefferson, Perry, Union, Williamson	42 min
Dec 10, 11:37 PM CST	Tornado Warning	PAH	Spencer	34 min
Dec 10, 11:37 PM CST	Tornado Warning Tornado observedConsiderable damage threat	MEG	Henry	27 min
Dec 10, 11:40 PM CST	Tornado Warning Tornado observedConsiderable damage threat	PAH	Calloway	15 min
Dec 10, 11:42 PM CST	Severe Thunderstorm Warning	LZK	Clark, Dallas, Ouachita	48 min
Dec 10, 11:48 PM CST	Severe Thunderstorm Warning	MEG	Crittenden	42 min
Dec 10, 11:52 PM CST	Tornado Warning	MEG	Crittenden	34 min
Dec 11, 12:02 AM CST	Severe Thunderstorm Warning	MEG	Crittenden, Lee, St. Francis	43 min
Dec 11, 12:03 AM CST	Tornado Warning Tornado observedConsiderable damage threat	PAH	Christian, Trigg	42 min
Dec 11, 12:05 AM CST	Tornado Warning	MEG	Shelby	22 min
Dec 11, 12:08 AM CST	Severe Thunderstorm Warning	PAH	Franklin, Hamilton, Jefferson, Saline, Wayne, White and 1 more	32 min
Dec 11, 12:17 AM CST	Severe Thunderstorm Warning	LZK	Calhoun, Cleveland, Dallas, Ouachita	30 min
Dec 11, 12:30 AM CST	Severe Thunderstorm Warning	MEG	Crittenden	30 min
Dec 11, 12:36 AM CST	Tornado Warning Tornado observed	MEG	Fayette, Hardeman, Haywood	24 min
Dec 11, 12:46 AM CST	Severe Thunderstorm Warning	MEG	Lee, Phillips, St. Francis	44 min
Dec 11, 12:48 AM CST	Severe Thunderstorm Warning	MEG	Crittenden, Lee, St. Francis	42 min
Dec 11, 12:57 AM CST	Severe Thunderstorm Warning	MEG	Carroll, Crockett, Fayette, Gibson, Hardeman, Haywood and 1 more	48 min
Dec 11, 12:59 AM CST	Severe Thunderstorm Warning	MEG	Fayette, Hardeman, Shelby	31 min
Dec 11, 1:05 AM CST	Severe Thunderstorm Warning	LZK	Arkansas, Cleveland, Desha, Lincoln	55 min
Dec 11, 1:25 AM CST	Severe Thunderstorm Warning	MEG	Benton, Carroll, Chester, Decatur, Gibson, Hardeman and 2 more	65 min
Dec 11, 1:32 AM CST	Tornado Warning	MEG	Carroll, Chester, Henderson, Madison	28 min
Dec 11, 1:46 AM CST	Flash Flood Warning	PAH	Calloway, Christian, Todd, Trigg	8 hr
Dec 11, 1:53 AM CST	Tornado Warning	MEG	Benton, Carroll, Decatur, Henderson	25 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 9.1 hours before the alert went out and 144 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 547 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 475 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

As transmitted.

676 
WWUS20 KWNS 102105
SEL2  
SPC WW 102105
ARZ000-ILZ000-INZ000-KYZ000-MOZ000-MSZ000-TNZ000-110500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 552
NWS Storm Prediction Center Norman OK
300 PM CST Fri Dec 10 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Central and northeastern Arkansas
  Southern Illinois
  Southwestern Indiana
  Western Kentucky
  Southeastern Missouri
  Northwestern Mississippi
  Western Tennessee

* Effective this Friday afternoon and evening from 300 PM until
  1100 PM CST.

* Primary threats include...
  Several tornadoes and a couple intense tornadoes likely
  Scattered damaging winds likely with isolated significant gusts
    to 75 mph possible
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible

SUMMARY...Scattered supercell development is expected this afternoon
through early tonight from central Arkansas northeastward toward the
confluence of the Mississippi and Ohio Rivers.  Other storm
development is expected early tonight along a cold front moving into
Missouri and Arkansas.  The storm environment will favor the
potential for a few strong tornadoes this evening through early
tonight, as well as damaging winds and large hail.

The tornado watch area is approximately along and 100 statute miles
east and west of a line from 10 miles west southwest of Pine Bluff
AR to 35 miles northeast of Carbondale IL. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU2).

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.

&&

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24050.

...Thompson

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 10, 1:35 PM CST	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Cross and 22 more	2 hr
Dec 10, 4:20 PM CST	Mesoscale Discussion	SPC	Hempstead, Howard, Little River, Miller, Pike, Sevier	85 min
Dec 10, 4:45 PM CST	Mesoscale Discussion	SPC	Arkansas, Clay, Craighead, Crittenden, Cross, Grant and 17 more	90 min
Dec 10, 5:17 PM CST	Tornado Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 18 more	6 hr
Dec 10, 5:27 PM CST	Mesoscale Discussion	SPC	Calhoun, Jersey	3 hr
Dec 10, 5:52 PM CST	Mesoscale Discussion	SPC	Crawford, Floyd, Harrison, Perry, Spencer	83 min
Dec 10, 5:17 PM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 9 more	88 min
Dec 10, 2:44 PM CST	Mesoscale Discussion	SPC	Audrain, Boone, Carroll, Chariton, Clark, Cooper and 13 more	2 hr

Nearby

Tornado Watches in Arkansas, 2021 Tornado Watches in Missouri, 2021 Tornado Watches in Illinois, 2021 Every 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.