Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 130, NWS St. Louis, MO

July 10, 20215 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 10, 2021, 1:36 AM CDT for 5 counties in Illinois. It was in force for 54 min. 1 report 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, 1:36 AM CDT (06:36 UTC)
Expired: Jul 10, 2021, 2:30 AM CDT
In force: 54 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Bond County, IL, Clinton County, IL, Marion County, IL, Saint Clair County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 127 km from the middle of the area, began a volume at 06:35 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, 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, 6.6 hours before the alert went out and 195 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.

506 
WUUS53 KLSX 100636
SVRLSX
ILC005-027-121-163-189-100730-
/O.NEW.KLSX.SV.W.0130.210710T0636Z-210710T0730Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Clinton County in south central Illinois...
  South central Bond County in south central Illinois...
  Marion County in south central Illinois...
  Washington County in south central Illinois...
  Southeastern St. Clair County in southwestern Illinois...

* Until 230 AM CDT.

* At 135 AM CDT, severe thunderstorms were located along a line
  extending from near Highland to near New Memphis to near Baldwin,
  moving east at 55 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Trained weather spotters.

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

* Severe thunderstorms will be near...
  St. Rose, Albers and Jamestown around 140 AM CDT.
  Breese and Okawville around 145 AM CDT.
  Carlyle, Beckemeyer and Tilden around 150 AM CDT.

Other locations in the path of these severe thunderstorms include
Nashville, Boulder, Sandoval, Central City, Fairman, Shattuc,
Centralia, Odin, Irvington, Ashley, Salem and Helm.

This includes the following highways...
 Interstate 57 in Illinois between exits 109 and 116.
 Interstate 64 in Illinois between exits 34 and 61.

This also includes Carlyle Lake Recreational Area.
 
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 3847 8914 3821 8915 3822 8988 3847 8970
      3876 8956 3869 8870 3847 8870
TIME...MOT...LOC 0635Z 284DEG 48KT 3876 8962 3848 8974 3824 8990 

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

Gosselin

3 follow-up statements

906 
WWUS53 KLSX 100704
SVSLSX

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

ILC005-163-100714-
/O.CAN.KLSX.SV.W.0130.000000T0000Z-210710T0730Z/
Bond IL-St. Clair IL-
204 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL BOND AND
SOUTHEASTERN ST. CLAIR COUNTIES IS CANCELLED...

The storms which prompted the warning have weakened. Therefore, the 
warning has been cancelled.

LAT...LON 3847 8914 3821 8915 3823 8970 3865 8946
      3869 8870 3847 8870
TIME...MOT...LOC 0704Z 284DEG 48KT 3867 8918 3839 8930 3815 8946 

$$

ILC027-121-189-100730-
/O.CON.KLSX.SV.W.0130.000000T0000Z-210710T0730Z/
Clinton IL-Marion IL-Washington IL-
204 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR SOUTHEASTERN CLINTON...SOUTHERN MARION AND WASHINGTON COUNTIES...

At 204 AM CDT, severe thunderstorms were located along a line
extending from near Boulder to near Nashville to 7 miles northwest of
Pinckneyville, moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Centralia, Sandoval, Central City, Irvington, Odin, Ashley, Salem 
  and Helm.

This includes the following highways...
 Interstate 57 in Illinois between exits 109 and 116.
 Interstate 64 in Illinois between exits 41 and 61.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3847 8914 3821 8915 3823 8970 3865 8946
      3869 8870 3847 8870
TIME...MOT...LOC 0704Z 284DEG 48KT 3867 8918 3839 8930 3815 8946 

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

Gosselin

231 
WWUS53 KLSX 100718
SVSLSX

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

ILC027-121-189-100730-
/O.CON.KLSX.SV.W.0130.000000T0000Z-210710T0730Z/
Clinton IL-Marion IL-Washington IL-
218 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR EAST CENTRAL CLINTON...SOUTHERN MARION AND WASHINGTON COUNTIES...

At 218 AM CDT, severe thunderstorms were located along a line
extending from Salem to near Woodlawn to near Tamaroa, moving east at
55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Centralia, Salem, Nashville, Sandoval, Wamac, Central City, Odin,
Irvington, Ashley, Shattuc, Helm, Posen, Beaucoup, Hoyleton, Hoffman,
Iuka, Junction City, Richview, Oakdale and Radom.

This includes the following highways...
 Interstate 57 in Illinois between exits 109 and 116.
 Interstate 64 in Illinois between exits 50 and 61.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3847 8914 3821 8915 3823 8959 3864 8921
      3864 8870 3847 8870
TIME...MOT...LOC 0718Z 284DEG 48KT 3863 8897 3835 8909 3811 8925 

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

Gosselin

385 
WWUS53 KLSX 100726
SVSLSX

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

ILC027-121-189-100736-
/O.EXP.KLSX.SV.W.0130.000000T0000Z-210710T0730Z/
Clinton IL-Marion IL-Washington IL-
226 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CLINTON...
SOUTHERN MARION AND WASHINGTON COUNTIES WILL EXPIRE AT 230 AM CDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 3847 8914 3821 8915 3823 8959 3864 8921
      3864 8870 3847 8870
TIME...MOT...LOC 0726Z 284DEG 48KT 3861 8886 3833 8898 3809 8914 

$$

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, 12:42 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Monroe, Saint Clair, Washington	63 min
Jul 10, 1:08 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	52 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

Nearby

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.