Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 192, NWS St. Louis, MO

December 10, 2021Madison County, Saint Clair County, Illinois; City of Saint Louis, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Dec 10, 2021, 10:05 PM CST for Madison County, Saint Clair County, Illinois; City of Saint Louis, Missouri. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Dec 10, 2021, 10:05 PM CST (04:05 UTC)
Expired
Dec 10, 2021, 10:30 PM CST
In force
25 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO

The radar

The St Louis radar (KLSX), 59 km from the middle of the area, began a volume at 04:06 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 watch it was issued in

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

IssuedProductOfficeLasted
Dec 10, 3:07 PM CSTTornado WatchSPC11 hr
Dec 10, 5:17 PM CSTTornado WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.1 hours before the alert went out and 209 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2021-12-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 119 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2021-12-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 341 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

608 
WUUS53 KLSX 110405
SVRLSX
ILC119-163-MOC510-110430-
/O.NEW.KLSX.SV.W.0192.211211T0405Z-211211T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1005 PM CST Fri Dec 10 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southern Madison County in southwestern Illinois...
  Northern St. Clair County in southwestern Illinois...
  Southeastern St. Louis City in east central Missouri...

* Until 1030 PM CST.

* At 1004 PM CST, severe thunderstorms were located along a line
  extending from near Glen Carbon to East Carondelet, moving east at
  50 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Edwardsville, Troy, Maryville and Pontoon Beach around 1010 PM 
  CST.
  Glen Carbon around 1015 PM CST.
  Fairview Heights, St. Jacob and Marine around 1020 PM CST.

Other locations in the path of these severe thunderstorms include
Belleville, Collinsville, Swansea, Shiloh, Caseyville, O'Fallon,
Highland and Lebanon.

This includes the following highways...
 Interstate 70 in Illinois between exits 21 and 24.
 Interstate 55 in Illinois near exit 23.
 Interstate 64 in Illinois between exits 9 and 19.

This also includes Horseshoe Lake State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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

&&

LAT...LON 3857 8976 3852 9026 3853 9026 3853 9027
      3875 9012 3886 8963
TIME...MOT...LOC 0404Z 253DEG 41KT 3878 9001 3854 9024 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

19
1 follow-up statement
791 
WWUS53 KLSX 110422
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1022 PM CST Fri Dec 10 2021

ILC163-MOC510-110431-
/O.CAN.KLSX.SV.W.0192.000000T0000Z-211211T0430Z/
St. Clair IL-St. Louis City MO-
1022 PM CST Fri Dec 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ST. CLAIR  AND
SOUTHEASTERN ST. LOUIS CITY 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. A Tornado Watch also remains in effect until 1100 PM CST
for southwestern Illinois.

LAT...LON 3865 8972 3866 9005 3878 8997 3886 8963
TIME...MOT...LOC 0421Z 253DEG 41KT 3883 8980 3859 9003 

$$

ILC119-110430-
/O.CON.KLSX.SV.W.0192.000000T0000Z-211211T0430Z/
Madison IL-
1022 PM CST Fri Dec 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CST
FOR SOUTHEASTERN MADISON COUNTY IN SOUTHWESTERN ILLINOIS...

At 1021 PM CST, severe thunderstorms were located along a line
extending from near Marine to Fairview Heights, moving east at 45
mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Marine around 1025 PM CST.

Other locations in the path of these severe thunderstorms include
Highland, Troy and St. Jacob.

This includes the following highways...
 Interstate 70 in Illinois between exits 21 and 24.
 Interstate 55 in Illinois near exit 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for southwestern
Illinois. A Tornado Watch also remains in effect until 1100 PM CST
for southwestern Illinois.

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

&&

LAT...LON 3865 8972 3866 9005 3878 8997 3886 8963
TIME...MOT...LOC 0421Z 253DEG 41KT 3883 8980 3859 9003 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BSH

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 10, 6:42 PM CSTTornado WarningLSXPike48 min
Dec 10, 7:11 PM CSTTornado WarningLSXPike49 min
Dec 10, 7:16 PM CSTTornado WarningLSXPike14 min
Dec 10, 7:30 PM CSTTornado WarningLSXCalhoun, Greene, Jersey45 min
Dec 10, 7:35 PM CSTTornado Warning Tornado observedLSXCalhoun, Jersey40 min
Dec 10, 7:36 PM CSTTornado WarningLSXPike21 min
Dec 10, 8:06 PM CSTTornado Warning Tornado observedLSXJersey, Macoupin, Madison39 min
Dec 10, 8:33 PM CSTTornado Warning Tornado observedConsiderable damage threatLSXBond, Madison42 min
Dec 10, 8:37 PM CSTTornado WarningLSXMacoupin, Madison17 min
Dec 10, 8:44 PM CSTTornado Warning Tornado observedLSXFayette, Macoupin, Madison, Montgomery46 min
Dec 10, 8:56 PM CSTTornado WarningLSXBond, Fayette, Montgomery34 min
Dec 10, 9:07 PM CSTSevere Thunderstorm WarningLSXCalhoun38 min
Dec 10, 9:39 PM CSTTornado WarningLSXMacoupin, Madison51 min
Dec 10, 10:18 PM CSTSevere Thunderstorm WarningLSXBond, Fayette, Macoupin, Madison, Montgomery57 min
Dec 10, 10:19 PM CSTSevere Thunderstorm WarningLSXMonroe, Randolph, Saint Clair41 min
Dec 10, 10:26 PM CSTTornado WarningLSXBond, Fayette, Montgomery49 min
Dec 10, 10:51 PM CSTSevere Thunderstorm WarningLSXClinton, Saint Clair, Washington39 min
Dec 10, 11:02 PM CSTTornado WarningLSXFayette29 min
Dec 10, 11:10 PM CSTTornado WarningLSXClinton, Marion, Washington50 min
Dec 10, 6:13 PM CSTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau47 min
Dec 10, 6:18 PM CSTSevere Thunderstorm WarningLSXCole, Osage42 min
Dec 10, 6:27 PM CSTTornado WarningLSXAudrain, Callaway34 min
Dec 10, 6:30 PM CSTTornado WarningLSXCallaway, Cole, Gasconade, Montgomery, Osage45 min
Dec 10, 6:42 PM CSTSevere Thunderstorm WarningLSXCrawford, Franklin, Gasconade, Osage48 min
Dec 10, 6:49 PM CSTTornado WarningLSXFranklin, Gasconade, Osage, Warren41 min
Dec 10, 6:50 PM CSTTornado WarningLSXAudrain, Callaway, Montgomery, Pike, Ralls40 min
Dec 10, 7:00 PM CSTTornado WarningLSXGasconade, Lincoln, Montgomery, Pike, Warren45 min
Dec 10, 7:02 PM CSTTornado WarningLSXCrawford, Franklin, Gasconade43 min
Dec 10, 7:16 PM CSTTornado WarningLSXFranklin, Lincoln, Saint Charles, Warren44 min
Dec 10, 7:49 PM CSTSevere Thunderstorm WarningLSXCrawford, Washington26 min
Dec 10, 8:10 PM CSTSevere Thunderstorm WarningLSXFranklin35 min
Dec 10, 8:29 PM CSTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis, City of Saint Louis30 min
Dec 10, 8:34 PM CSTSevere Thunderstorm WarningLSXCrawford, Franklin, Gasconade, Osage41 min
Dec 10, 8:47 PM CSTTornado WarningLSXFranklin, Gasconade, Warren43 min
Dec 10, 10:00 PM CSTSevere Thunderstorm WarningLSXIron, Reynolds45 min
Dec 10, 10:14 PM CSTTornado WarningLSXIron, Madison, Reynolds46 min
Dec 10, 10:26 PM CSTSevere Thunderstorm WarningLSXReynolds20 min
Dec 10, 10:55 PM CSTSevere Thunderstorm WarningLSXMadison18 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021Severe Thunderstorm Warnings in Missouri, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.