Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 190, NWS St. Louis, MO

December 10, 2021Calhoun County, Illinois; 7 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Dec 10, 2021, 9:07 PM CST for Calhoun County, Illinois; 7 counties in Missouri. It was in force for 38 min. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Dec 10, 2021, 9:07 PM CST (03:07 UTC)
Expired: Dec 10, 2021, 9:45 PM CST
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Calhoun County, IL, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 16 km from the middle of the area, began a volume at 03:08 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 was reported inside it

Time	Report	Where	Remark
Dec 10, 9:09 PM CST	TSTM WND DMG	5 Sw Union, MO	FRANKLIN COUNTY DISPATCH REPORTED TREES AND POWER LINES WERE DOWN ALONG CAMP MO-VAL ROAD WSW OF UNION. TIME ESTIMATED FROM RADAR.
Dec 10, 9:13 PM CST	TSTM WND DMG	2 Ssw Union, MO	FRANKLIN COUNTY DISPATCH REPORTED TREES DOWN ACROSS NORTH BEND LOOP SW OF UNION. TIME ESTIMATED FROM RADAR.
Dec 10, 9:14 PM CST	HAIL 0.25	3 W Union, MO	REPORT OF PEA SIZED HAIL JUST WEST OF UNION, MO.
Dec 10, 9:28 PM CST	TSTM WND DMG	Saint Clair, MO	FRANKLIN COUNT DISPATCH REPORTED POWER LINES DOWN AT 75 SOUTH MAIN STREET IN ST. CLAIR. TIME ESTIMATED FROM RADAR.
Dec 10, 9:30 PM CST	TSTM WND DMG	3 Wnw Robertsville, MO	FRANKLIN COUNTY DISPATCH REPORTED A TREE OVER THE ROADWAY AT STATE HWY O AND ROUTE MM. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Dec 10, 5:17 PM CST	Tornado Watch	SPC	6 hr
Dec 10, 3:07 PM CST	Tornado Watch	SPC	11 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.1 hours before the alert went out and 225 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

451 
WUUS53 KLSX 110307
SVRLSX
ILC013-MOC071-099-113-183-189-219-510-110345-
/O.NEW.KLSX.SV.W.0190.211211T0307Z-211211T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
907 PM CST Fri Dec 10 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southeastern Calhoun County in southwestern Illinois...
  St. Louis City in east central Missouri...
  St. Charles County in east central Missouri...
  Northwestern Jefferson County in east central Missouri...
  Southeastern Lincoln County in east central Missouri...
  Franklin County in east central Missouri...
  St. Louis County in east central Missouri...
  Southeastern Warren County in east central Missouri...

* Until 945 PM CST.

* At 906 PM CST, severe thunderstorms were located along a line
  extending from near Treloar to Marthasville to Beaufort to near
  Sullivan, moving northeast at 75 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Washington, Warrenton, Marthasville, Truesdale and Dutzow around 
  910 PM CST.
  Union, Wright City, Innsbrook and New Melle around 915 PM CST.
  Wentzville, St. Clair and Parkway around 920 PM CST.
  O'Fallon, Lake St. Louis, Dardenne Prairie, Weldon Spring, 
  Cottleville, St. Paul, Josephville, Augusta, Fountain N' Lakes and 
  Chain of Rocks around 925 PM CST.

Other locations in the path of these severe thunderstorms include St.
Peters, Gray Summit, Villa Ridge, Winfield, Defiance, Harvester, St.
Charles, Wildwood, Ballwin, Ellisville, Pacific, Clarkson Valley,
Spirit of St. Louis Airport, Orchard Farms, Florissant, Chesterfield,
Hazelwood, Town and Country, Eureka, Byrnes Mill, High Ridge, Portage
Des Sioux, House Springs, University City, Kirkwood, Maryland
Heights, Webster Groves, Ferguson, Manchester, Creve Coeur, Overland,
Clayton and St. Ann.

This includes the following highways...
 Interstate 44 in Missouri between exits 230 and 277.
 Interstate 55 in Missouri between exits 190 and 191.
 Interstate 70 in Missouri between exits 193 and 231.

This also includes Babler Memorial State Park, Scott Joplin Historic
Site, Route 66 State Park, Castlewood State Park, Confluence State
Park, First Missouri State Capitol Historic Site, and Robertsville
State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for southwestern
Illinois...and east central Missouri. A Tornado Watch also remains in
effect until 1100 PM CST for southwestern Illinois...and east central
Missouri.

A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3880 9012 3872 9021 3863 9018 3852 9027
      3843 9030 3821 9133 3837 9129 3857 9114
      3874 9130 3913 9061 3907 9058 3905 9059
      3903 9057 3900 9057 3896 9053 3897 9048
      3896 9041 3892 9031 3892 9027 3885 9011
TIME...MOT...LOC 0306Z 242DEG 65KT 3872 9116 3861 9105 3841 9120 3825
9125

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Britt

2 follow-up statements

251 
WWUS53 KLSX 110321
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
921 PM CST Fri Dec 10 2021

ILC013-MOC071-099-113-183-189-219-510-110345-
/O.CON.KLSX.SV.W.0190.000000T0000Z-211211T0345Z/
Calhoun IL-St. Louis City MO-St. Charles MO-Jefferson MO-Lincoln MO-
Franklin MO-St. Louis MO-Warren MO-
921 PM CST Fri Dec 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CST
FOR SOUTHEASTERN CALHOUN...ST. CHARLES...NORTHWESTERN JEFFERSON...
SOUTHEASTERN LINCOLN...EAST CENTRAL FRANKLIN...ST. LOUIS AND
SOUTHEASTERN WARREN COUNTIES AND ST. LOUIS CITY...

At 921 PM CST, severe thunderstorms were located along a line
extending from Wentzville to Dardenne Prairie to Villa Ridge to near
St. Clair, moving northeast at 70 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  O'Fallon, St. Peters, Lake St. Louis, Dardenne Prairie, Weldon 
  Spring, Cottleville, St. Paul, Josephville, Fountain N' Lakes and 
  Chain of Rocks around 925 PM CST.

Other locations in the path of these severe thunderstorms include
Winfield, Harvester, St. Charles, Wildwood, Ballwin, Maryland
Heights, Bridgeton, Ellisville, Clarkson Valley, Spirit of St. Louis
Airport, Orchard Farms, House Springs, Florissant, Chesterfield,
Hazelwood, Manchester, Town and Country, Eureka, Byrnes Mill, High
Ridge, Winchester, Portage Des Sioux, Arnold, Creve Coeur, Overland,
Ladue, Des Peres, Olivette, Valley Park, Fenton, Frontenac, Murphy,
University City, Kirkwood, Webster Groves, Ferguson, Clayton, St.
Ann, Crestwood, Berkeley, Richmond Heights, Sunset Hills, Jennings,
Bellefontaine Neighbors, Maplewood, Black Jack, Dellwood, Riverview,
Spanish Lake, Lemay, Moline Acres, Flordell Hills, St. Louis and
Madison.

This also includes Babler Memorial State Park, Scott Joplin Historic
Site, Route 66 State Park, Castlewood State Park, Confluence State
Park, First Missouri State Capitol Historic Site, and Robertsville
State Park.
 
This includes the following highways...
 Interstate 44 in Missouri between exits 239 and 277.
 Interstate 55 in Missouri near exit 191.
 Interstate 70 in Missouri between exits 200 and 231.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for southwestern
Illinois...and east central Missouri. A Tornado Watch also remains in
effect until 1100 PM CST for southwestern Illinois...and east central
Missouri.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3880 9012 3872 9021 3863 9018 3852 9027
      3843 9030 3834 9100 3850 9104 3866 9097
      3885 9103 3913 9061 3907 9058 3905 9059
      3903 9057 3900 9057 3896 9053 3897 9048
      3896 9041 3892 9031 3892 9027 3885 9011
TIME...MOT...LOC 0321Z 244DEG 62KT 3884 9087 3874 9074 3849 9088 3838
9093

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Britt

752 
WWUS53 KLSX 110333
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
933 PM CST Fri Dec 10 2021

MOC219-110342-
/O.CAN.KLSX.SV.W.0190.000000T0000Z-211211T0345Z/
Warren MO-
933 PM CST Fri Dec 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area.  Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1100 PM CST for southwestern
Illinois...and east central Missouri. A Tornado Watch also remains in
effect until 1100 PM CST for southwestern Illinois...and east central
Missouri.

LAT...LON 3880 9012 3872 9021 3863 9018 3852 9027
      3843 9030 3834 9100 3855 9085 3873 9074
      3901 9079 3913 9061 3907 9058 3905 9059
      3903 9057 3900 9057 3896 9053 3897 9048
      3896 9041 3892 9031 3892 9027 3885 9011
TIME...MOT...LOC 0332Z 242DEG 65KT 3894 9065 3884 9052 3857 9067 3849
9076

$$

ILC013-MOC071-099-113-183-189-510-110345-
/O.CON.KLSX.SV.W.0190.000000T0000Z-211211T0345Z/
Calhoun IL-St. Louis City MO-St. Charles MO-Jefferson MO-Lincoln MO-
Franklin MO-St. Louis MO-
933 PM CST Fri Dec 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CST
FOR SOUTHEASTERN CALHOUN...NORTHWESTERN ST. CHARLES...NORTHWESTERN
JEFFERSON...SOUTHEASTERN LINCOLN...EAST CENTRAL FRANKLIN AND ST.
LOUIS COUNTIES AND ST. LOUIS CITY...

At 932 PM CST, severe thunderstorms were located along a line
extending from 6 miles southeast of Winfield to near St. Charles to
Wildwood to Pacific, moving northeast at 75 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Florissant, Hazelwood, Portage Des Sioux and Orchard Farms around 
  940 PM CST.

Other locations in the path of these severe thunderstorms include
Maryland Heights, Overland, Ladue, Olivette, Murphy, West Alton,
Champ, Webster Groves, Ferguson, St. Ann, Crestwood, Bridgeton,
Berkeley, Richmond Heights, Brentwood, St. John, Shrewsbury, St.
Louis, University City, Clayton, Jennings, Bellefontaine Neighbors,
Maplewood, Black Jack, Dellwood, Riverview, Hillsdale, East Alton and
Madison.

This also includes Babler Memorial State Park, Scott Joplin Historic
Site, Route 66 State Park, Castlewood State Park, Confluence State
Park, First Missouri State Capitol Historic Site, and Robertsville
State Park.
 
This includes the following highways...
 Interstate 44 in Missouri between exits 239 and 277.
 Interstate 55 in Missouri near exit 191.
 Interstate 70 in Missouri between exits 216 and 231.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for southwestern
Illinois...and east central Missouri. A Tornado Watch also remains in
effect until 1100 PM CST for southwestern Illinois...and east central
Missouri.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3880 9012 3872 9021 3863 9018 3852 9027
      3843 9030 3834 9100 3855 9085 3873 9074
      3901 9079 3913 9061 3907 9058 3905 9059
      3903 9057 3900 9057 3896 9053 3897 9048
      3896 9041 3892 9031 3892 9027 3885 9011
TIME...MOT...LOC 0332Z 242DEG 65KT 3894 9065 3884 9052 3857 9067 3849
9076

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Britt

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 10, 6:42 PM CST	Tornado Warning	LSX	Pike	48 min
Dec 10, 7:11 PM CST	Tornado Warning	LSX	Pike	49 min
Dec 10, 7:16 PM CST	Tornado Warning	LSX	Pike	14 min
Dec 10, 7:30 PM CST	Tornado Warning	LSX	Calhoun, Greene, Jersey	45 min
Dec 10, 7:35 PM CST	Tornado Warning Tornado observed	LSX	Calhoun, Jersey	40 min
Dec 10, 7:36 PM CST	Tornado Warning	LSX	Pike	21 min
Dec 10, 8:06 PM CST	Tornado Warning Tornado observed	LSX	Jersey, Macoupin, Madison	39 min
Dec 10, 8:33 PM CST	Tornado Warning Tornado observedConsiderable damage threat	LSX	Bond, Madison	42 min
Dec 10, 8:37 PM CST	Tornado Warning	LSX	Macoupin, Madison	17 min
Dec 10, 8:44 PM CST	Tornado Warning Tornado observed	LSX	Fayette, Macoupin, Madison, Montgomery	46 min
Dec 10, 8:56 PM CST	Tornado Warning	LSX	Bond, Fayette, Montgomery	34 min
Dec 10, 9:39 PM CST	Tornado Warning	LSX	Macoupin, Madison	51 min
Dec 10, 10:05 PM CST	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	25 min
Dec 10, 10:18 PM CST	Severe Thunderstorm Warning	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	57 min
Dec 10, 10:19 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair	41 min
Dec 10, 10:26 PM CST	Tornado Warning	LSX	Bond, Fayette, Montgomery	49 min
Dec 10, 10:51 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	39 min
Dec 10, 11:02 PM CST	Tornado Warning	LSX	Fayette	29 min
Dec 10, 11:10 PM CST	Tornado Warning	LSX	Clinton, Marion, Washington	50 min
Dec 10, 6:13 PM CST	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau	47 min
Dec 10, 6:18 PM CST	Severe Thunderstorm Warning	LSX	Cole, Osage	42 min
Dec 10, 6:27 PM CST	Tornado Warning	LSX	Audrain, Callaway	34 min
Dec 10, 6:30 PM CST	Tornado Warning	LSX	Callaway, Cole, Gasconade, Montgomery, Osage	45 min
Dec 10, 6:42 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	48 min
Dec 10, 6:49 PM CST	Tornado Warning	LSX	Franklin, Gasconade, Osage, Warren	41 min
Dec 10, 6:50 PM CST	Tornado Warning	LSX	Audrain, Callaway, Montgomery, Pike, Ralls	40 min
Dec 10, 7:00 PM CST	Tornado Warning	LSX	Gasconade, Lincoln, Montgomery, Pike, Warren	45 min
Dec 10, 7:02 PM CST	Tornado Warning	LSX	Crawford, Franklin, Gasconade	43 min
Dec 10, 7:16 PM CST	Tornado Warning	LSX	Franklin, Lincoln, Saint Charles, Warren	44 min
Dec 10, 7:49 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	26 min
Dec 10, 8:10 PM CST	Severe Thunderstorm Warning	LSX	Franklin	35 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, 8:47 PM CST	Tornado Warning	LSX	Franklin, Gasconade, Warren	43 min
Dec 10, 10:00 PM CST	Severe Thunderstorm Warning	LSX	Iron, Reynolds	45 min
Dec 10, 10:14 PM CST	Tornado Warning	LSX	Iron, Madison, Reynolds	46 min
Dec 10, 10:26 PM CST	Severe Thunderstorm Warning	LSX	Reynolds	20 min
Dec 10, 10:55 PM CST	Severe Thunderstorm Warning	LSX	Madison	18 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2021 Severe Thunderstorm Warnings in Illinois, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.