Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 128, NWS St. Louis, MO

July 10, 20216 counties in Illinois; Jefferson County, Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 10, 2021, 12:42 AM CDT for 6 counties in Illinois; Jefferson County, Saint Louis County, City of Saint Louis, Missouri. It was in force for 63 min. 7 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: Jul 10, 2021, 12:42 AM CDT (05:42 UTC)
Expired: Jul 10, 2021, 1:45 AM CDT
In force: 63 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bond County, IL, Clinton County, IL, Madison County, IL, Monroe County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Jefferson County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 62 km from the middle of the area, began a volume at 05:45 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
Jul 10, 12:51 AM CDT	TSTM WND GST 60	3 Nne Saint Louis, MO
Jul 10, 12:52 AM CDT	TSTM WND DMG	2 E Saint Louis, MO	THE STEEPLE ON THE CENTENARY UNITED METHODIST CHURCH PARTIALLY COLLAPSED DUE TO DAMAGING THUNDERSTORM WINDS NEAR THE INTERSECTION OF PINE STREET AND N. 17TH STREET.
Jul 10, 12:54 AM CDT	TSTM WND DMG	2 E Saint Louis, MO	DELAYED REPORT: LARGE, HEALTHY TREE BLOWN OVER IN THE PARK AREA NEAR 14TH AND PINE STREET IN DOWNTOWN. PHOTO AND REPORT SUBMITTED VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jul 10, 12:56 AM CDT	TSTM WND GST 60	1 Sw Granite City, IL	50-60 MPH ESTIMATED FROM A TRAINED SPOTTER.
Jul 10, 1:02 AM CDT	TSTM WND GST 66	1 Se Sauget, IL	66 MPH WIND GUST MEASURED AT CAHOKIA AIRPORT (KCPS).
Jul 10, 1:29 AM CDT	TSTM WND GST 71	Scott Afb, IL	MEASURED GUST AT SCOTT AIR FORCE BASE.
Jul 10, 1:42 AM CDT	TSTM WND DMG	Saint Libory, IL	LARGE BRANCH ROUGHLY 1 FOOT IN DIAMETER SNAPPED OFF OF TREE. 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
Jul 9, 8:18 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.7 hours before the alert went out and 210 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1282 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

482 
WUUS53 KLSX 100542
SVRLSX
ILC005-027-119-133-163-189-MOC099-189-510-100645-
/O.NEW.KLSX.SV.W.0128.210710T0542Z-210710T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1242 AM CDT Sat Jul 10 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Western Clinton County in south central Illinois...
  Southwestern Bond County in south central Illinois...
  Monroe County in southwestern Illinois...
  Madison County in southwestern Illinois...
  Western Washington County in south central Illinois...
  St. Clair County in southwestern Illinois...
  St. Louis City in east central Missouri...
  Northern Jefferson County in east central Missouri...
  Eastern St. Louis County in east central Missouri...

* Until 145 AM CDT.

* At 1242 AM CDT, severe thunderstorms were located along a line
  extending from near Portage Des Sioux to Mackenzie to near Byrnes
  Mill, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Trained weather spotters.

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

* Severe thunderstorms will be near...
  Lemay, Mehlville, Affton, Spanish Lake, Green Park, St. George, 
  Bella Villa, West Alton and East Carondelet around 1250 AM CDT.
  Cahokia, Columbia, Dupo, Cahokia Parks Airport and Brooklyn around 
  1255 AM CDT.
  St. Louis, Alton, Centreville, East Alton, Fairmont City and 
  Alorton around 100 AM CDT.

Other locations in the path of these severe thunderstorms include
Arnold, Wood River, Washington Park, South Roxana, Roxana, Hartford,
Rosewood Heights, East St. Louis, Fairview Heights, Bethalto, Pontoon
Beach, Millstadt, Barnhart, Oakville, Imperial, Belleville,
Edwardsville, Swansea, Shiloh, Valmeyer, Fountain, Maryville,
Freeburg, Smithton, Glen Carbon, Troy and Waterloo.

This includes the following highways...
 Interstate 70 in Illinois between exits 21 and 36.
 Interstate 55 in Illinois near exit 23.
 Interstate 64 in Illinois between exits 9 and 41.
 Interstate 55 in Missouri between exits 180 and 191.

This also includes Scott Joplin Historic Site, Mastodon Historic
Site, Gov. Dunklin's Grave Historic Site, and Horseshoe Lake State
Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for southwestern
Illinois...and east central Missouri.

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in St Louis.

&&

LAT...LON 3822 8953 3822 9007 3831 9068 3854 9031
      3883 9021 3883 9014 3881 9012 3885 9011
      3890 9018 3886 8951 3848 8937
TIME...MOT...LOC 0542Z 288DEG 26KT 3892 9027 3860 9031 3847 9059 

HAIL...<.75IN
WIND...60MPH
 
$$

Gosselin

3 follow-up statements

839 
WWUS53 KLSX 100554
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1254 AM CDT Sat Jul 10 2021

ILC005-027-119-133-163-189-MOC099-189-510-100645-
/O.CON.KLSX.SV.W.0128.000000T0000Z-210710T0645Z/
Clinton IL-Bond IL-Monroe IL-Madison IL-Washington IL-St. Clair IL-
St. Louis City MO-Jefferson MO-St. Louis MO-
1254 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR WESTERN CLINTON AND SOUTHWESTERN BOND COUNTIES IN SOUTH CENTRAL
ILLINOIS...MONROE AND MADISON COUNTIES IN SOUTHWESTERN ILLINOIS...
WESTERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...ST. CLAIR
COUNTY IN SOUTHWESTERN ILLINOIS...NORTHERN JEFFERSON AND EASTERN ST.
LOUIS COUNTIES IN EAST CENTRAL MISSOURI AND ST. LOUIS CITY...

At 1254 AM CDT, severe thunderstorms were located along a line
extending from Alton to near East Carondelet to High Ridge, moving
east at 30 mph.

HAZARD...70 mph wind gusts.

SOURCE...Lambert Airport reported a wind gust near 70 mph.

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

These severe storms will be near...
  Cahokia, Columbia, Dupo, Cahokia Parks Airport, East Alton, 
  Fairmont City, Brooklyn and East Carondelet around 100 AM CDT.

Other locations in the path of these severe thunderstorms include
Wood River, Centreville, Washington Park, Alorton, Hartford, Rosewood
Heights, East St. Louis, Bethalto, Pontoon Beach, Millstadt, South
Roxana, Roxana, Fairview Heights, Oakville, Swansea, Valmeyer,
Fountain, Belleville, Edwardsville, Shiloh, Maryville, Smithton, Glen
Carbon, Troy, Waterloo, Freeburg, Lebanon and Scott AFB.

This also includes Scott Joplin Historic Site, Mastodon Historic
Site, Gov. Dunklin's Grave Historic Site, and Horseshoe Lake State
Park.
 
This includes the following highways...
 Interstate 70 in Illinois between exits 21 and 36.
 Interstate 55 in Illinois near exit 23.
 Interstate 64 in Illinois between exits 9 and 41.
 Interstate 55 in Missouri between exits 180 and 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for southwestern
Illinois...and east central Missouri.

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.

&&

LAT...LON 3822 8953 3822 9007 3831 9068 3854 9031
      3883 9021 3883 9014 3881 9012 3885 9011
      3890 9018 3886 8951 3848 8937
TIME...MOT...LOC 0554Z 288DEG 26KT 3890 9019 3858 9023 3845 9051 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Gosselin

989 
WWUS53 KLSX 100616
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
116 AM CDT Sat Jul 10 2021

MOC189-510-100625-
/O.CAN.KLSX.SV.W.0128.000000T0000Z-210710T0645Z/
St. Louis City MO-St. Louis MO-
116 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ST. LOUIS COUNTY AND
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 200 AM CDT for southwestern
Illinois...and east central Missouri.

LAT...LON 3822 8953 3822 9007 3830 9061 3845 9034
      3839 9034 3843 9029 3852 9027 3863 9018
      3872 9021 3880 9012 3883 9011 3885 9011
      3890 9018 3886 8951 3848 8937
TIME...MOT...LOC 0615Z 288DEG 26KT 3886 9002 3854 9006 3841 9034 

$$

ILC005-027-119-133-163-189-MOC099-100645-
/O.CON.KLSX.SV.W.0128.000000T0000Z-210710T0645Z/
Clinton IL-Bond IL-Monroe IL-Madison IL-Washington IL-St. Clair IL-
Jefferson MO-
116 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR WESTERN CLINTON AND SOUTHWESTERN BOND COUNTIES IN SOUTH CENTRAL
ILLINOIS...MONROE AND MADISON COUNTIES IN SOUTHWESTERN ILLINOIS...
WESTERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...ST. CLAIR
COUNTY IN SOUTHWESTERN ILLINOIS AND NORTHEASTERN JEFFERSON COUNTIES
IN EAST CENTRAL MISSOURI...

At 115 AM CDT, severe thunderstorms were located along a line
extending from near Roxana to near Belleville to near Arnold, moving
east at 30 mph.

HAZARD...70 mph wind gusts.

SOURCE...Trained weather spotters.

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

Locations impacted include...
  Fairview Heights, Millstadt, Belleville, Edwardsville, Swansea, 
  Shiloh, Columbia, Maryville, Freeburg, Smithton, Glen Carbon, 
  Troy, Waterloo, Lebanon, Scott AFB, Mascoutah, Marine, New Design, 
  New Baden, St. Jacob and Highland.

This also includes Mastodon Historic Site, Gov. Dunklin's Grave
Historic Site, and Horseshoe Lake State Park.
 
This includes the following highways...
 Interstate 70 in Illinois between exits 21 and 36.
 Interstate 55 in Illinois near exit 23.
 Interstate 64 in Illinois between exits 9 and 41.
 Interstate 55 in Missouri between exits 180 and 190.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for southwestern
Illinois...and east central Missouri.

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.

&&

LAT...LON 3822 8953 3822 9007 3830 9061 3845 9034
      3839 9034 3843 9029 3852 9027 3863 9018
      3872 9021 3880 9012 3883 9011 3885 9011
      3890 9018 3886 8951 3848 8937
TIME...MOT...LOC 0615Z 288DEG 26KT 3886 9002 3854 9006 3841 9034 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Gosselin

048 
WWUS53 KLSX 100632
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
132 AM CDT Sat Jul 10 2021

MOC099-100642-
/O.CAN.KLSX.SV.W.0128.000000T0000Z-210710T0645Z/
Jefferson MO-
132 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JEFFERSON 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 200 AM CDT for southwestern
Illinois.

LAT...LON 3822 8953 3822 9007 3827 9037 3833 9017
      3863 8997 3885 8994 3886 8951 3848 8937
TIME...MOT...LOC 0632Z 288DEG 26KT 3883 8990 3851 8994 3838 9022 

$$

ILC005-027-119-133-163-189-100645-
/O.CON.KLSX.SV.W.0128.000000T0000Z-210710T0645Z/
Clinton IL-Bond IL-Monroe IL-Madison IL-Washington IL-St. Clair IL-
132 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR WESTERN CLINTON AND SOUTHWESTERN BOND COUNTIES IN SOUTH CENTRAL
ILLINOIS...CENTRAL MONROE AND SOUTHEASTERN MADISON COUNTIES IN
SOUTHWESTERN ILLINOIS...WESTERN WASHINGTON COUNTY IN SOUTH CENTRAL
ILLINOIS AND ST. CLAIR COUNTIES IN SOUTHWESTERN ILLINOIS...

At 132 AM CDT, severe thunderstorms were located along a line
extending from near Edwardsville to near Shiloh to near Fountain,
moving east at 30 mph.

HAZARD...70 mph wind gusts.

SOURCE...Trained weather spotters reported a 72 mph wind gust in 
         O'Fallon Illinois.

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

Locations impacted include...
Belleville, O'Fallon, Collinsville, Edwardsville, Fairview Heights,
Swansea, Glen Carbon, Shiloh, Highland, Troy, Waterloo, Maryville,
Mascoutah, Breese, Lebanon, Freeburg, Millstadt, Red Bud, New Baden
and Scott AFB.

This includes the following highways...
 Interstate 70 in Illinois between exits 21 and 36.
 Interstate 55 in Illinois near exit 23.
 Interstate 64 in Illinois between exits 12 and 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for southwestern
Illinois.

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.

&&

LAT...LON 3822 8953 3822 9007 3827 9037 3833 9017
      3863 8997 3885 8994 3886 8951 3848 8937
TIME...MOT...LOC 0632Z 288DEG 26KT 3883 8990 3851 8994 3838 9022 

HAIL...<.75IN
WIND...70MPH
 
$$

Gosselin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:07 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	38 min
Jul 9, 8:43 PM CDT	Severe Thunderstorm Warning	LSX	Brown	47 min
Jul 9, 9:10 PM CDT	Severe Thunderstorm Warning	LSX	Adams	65 min
Jul 9, 9:17 PM CDT	Severe Thunderstorm Warning	LSX	Brown, Pike	43 min
Jul 9, 10:03 PM CDT	Areal Flood Advisory	LSX	Adams, Brown, Pike	3 hr
Jul 9, 11:24 PM CDT	Areal Flood Advisory	LSX	Pike	3 hr
Jul 9, 11:28 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	47 min
Jul 9, 11:57 PM CDT	Areal Flood Advisory	LSX	Calhoun, Greene, Pike	3 hr
Jul 9, 11:59 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Madison	61 min
Jul 10, 12:26 AM CDT	Areal Flood Advisory	LSX	Calhoun, Jersey	3 hr
Jul 10, 1:08 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	52 min
Jul 10, 1:36 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Marion, Saint Clair, Washington	54 min
Jul 10, 1:50 AM CDT	Severe Thunderstorm Warning	LSX	Randolph	40 min
Jul 10, 2:49 AM CDT	River Flood Warning	LSX	Calhoun, Greene, Jersey	10 days
Jul 10, 3:05 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	21 min
Jul 10, 3:11 PM CDT	Areal Flood Advisory	LSX	Macoupin, Madison	3 hr
Jul 10, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Randolph, Washington	59 min
Jul 9, 8:21 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion	39 min
Jul 9, 8:55 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	50 min
Jul 9, 8:58 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	62 min
Jul 9, 9:00 PM CDT	Severe Thunderstorm Warning	LSX	Knox	45 min
Jul 9, 9:08 PM CDT	Areal Flood Advisory	LSX	Lewis, Marion	32 min
Jul 9, 9:14 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	48 min
Jul 9, 9:36 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Monroe, Pike, Ralls, Shelby	54 min
Jul 9, 9:40 PM CDT	Flash Flood Warning	LSX	Lewis, Marion	3 hr
Jul 9, 10:10 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Lincoln, Monroe, Pike, Ralls	50 min
Jul 9, 10:32 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Shelby	23 min
Jul 9, 10:45 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Lincoln, Montgomery, Pike, Warren	45 min
Jul 9, 11:08 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Franklin, Gasconade, Montgomery, Osage, Warren	67 min
Jul 9, 11:10 PM CDT	River Flood Warning	LSX	Lewis	5 days
Jul 9, 11:10 PM CDT	River Flood Warning	LSX	Lewis	32 hr
Jul 9, 11:10 PM CDT	River Flood Warning	LSX	Marion	4 days
Jul 10, 12:41 AM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	3 hr
Jul 10, 1:49 AM CDT	River Flood Warning	LSX	Marion	18 hr
Jul 10, 2:29 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison	21 min
Jul 10, 6:14 AM CDT	River Flood Warning	LSX	Monroe	4 days
Jul 10, 8:30 AM CDT	River Flood Warning	LSX	Lincoln	3 days
Jul 10, 2:15 PM CDT	Areal Flood Advisory	LSX	Saint Charles, Saint Louis	3 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2021 Severe Thunderstorm Warnings in Missouri, 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.