Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 134, NWS St. Louis, MO

July 10, 20214 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 10, 2021, 4:31 PM CDT for 4 counties in Illinois. It was in force for 59 min. 3 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, 4:31 PM CDT (21:31 UTC)
Expired: Jul 10, 2021, 5:30 PM CDT
In force: 59 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Clinton County, IL, Marion County, IL, Randolph County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 130 km from the middle of the area, began a volume at 21:33 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, 4:40 PM CDT	TSTM WND DMG	Coulterville, IL	A FEW TREES AND LIMBS DOWN IN COULTERVILLE.
Jul 10, 4:48 PM CDT	TSTM WND DMG	2 E Central City, IL	MULTIPLE LARGE TREES DOWN. IMAGES SHARED VIA SOCIAL MEDIA. TIME BASED ON RADAR.
Jul 10, 5:06 PM CDT	TSTM WND DMG	Salem, IL	LARGE PARTIALLY ROTTER TREE SNAPPED AT THE BASE OF THE TRUNK. IMAGE SHARED VIA SOCIAL MEDIA. 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 10, 2:01 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.5 hours before the alert went out and 207 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: 952 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

744 
WUUS53 KLSX 102131
SVRLSX
ILC027-121-157-189-102230-
/O.NEW.KLSX.SV.W.0134.210710T2131Z-210710T2230Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  East central Clinton County in south central Illinois...
  Marion County in south central Illinois...
  Washington County in south central Illinois...
  Eastern Randolph County in southwestern Illinois...

* Until 530 PM CDT.

* At 431 PM CDT, severe thunderstorms were located along a line
  extending from near Patoka to near Evansville, moving east at 25
  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...
  Sandoval, Patoka and Fairman around 435 PM CDT.
  Odin around 445 PM CDT.

Other locations in the path of these severe thunderstorms include
Salem, Steeleville, Percy, Kinmundy, Omega and Stephen Forbes
Station.

This includes the following highways...
 Interstate 57 in Illinois between exits 109 and 127.
 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.

&&

LAT...LON 3847 8914 3821 8915 3822 8959 3795 8960
      3782 8968 3799 8994 3874 8914 3882 8907
      3876 8870 3847 8870
TIME...MOT...LOC 2131Z 272DEG 21KT 3872 8913 3807 8983 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

CVKING

3 follow-up statements

608 
WWUS53 KLSX 102156
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
456 PM CDT Sat Jul 10 2021

ILC157-102205-
/O.CAN.KLSX.SV.W.0134.000000T0000Z-210710T2230Z/
Randolph IL-
456 PM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN RANDOLPH COUNTY IS
CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Illinois.

LAT...LON 3847 8914 3821 8915 3822 8959 3877 8906
      3876 8870 3847 8870
TIME...MOT...LOC 2155Z 272DEG 21KT 3871 8895 3807 8965 

$$

ILC027-121-189-102230-
/O.CON.KLSX.SV.W.0134.000000T0000Z-210710T2230Z/
Clinton IL-Marion IL-Washington IL-
456 PM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR EAST CENTRAL CLINTON...MARION AND EASTERN WASHINGTON COUNTIES...

At 455 PM CDT, severe thunderstorms were located along a line
extending from near Salem to near Percy, moving east at 25 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
  Salem, Omega and Stephen Forbes Station.

This includes the following highways...
 Interstate 57 in Illinois between exits 109 and 127.
 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.

&&

LAT...LON 3847 8914 3821 8915 3822 8959 3877 8906
      3876 8870 3847 8870
TIME...MOT...LOC 2155Z 272DEG 21KT 3871 8895 3807 8965 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

CVKING

242 
WWUS53 KLSX 102206
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
506 PM CDT Sat Jul 10 2021

ILC027-189-102216-
/O.CAN.KLSX.SV.W.0134.000000T0000Z-210710T2230Z/
Clinton IL-Washington IL-
506 PM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CLINTON AND
EASTERN WASHINGTON COUNTIES IS CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Illinois.

LAT...LON 3847 8905 3877 8899 3876 8870 3847 8870
TIME...MOT...LOC 2206Z 270DEG 27KT 3872 8891 3850 8895 

$$

ILC121-102230-
/O.CON.KLSX.SV.W.0134.000000T0000Z-210710T2230Z/
Marion IL-
506 PM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR CENTRAL MARION COUNTY...

At 506 PM CDT, severe thunderstorms were located along a line
extending from near Kinmundy to 9 miles south of Salem, moving east
at 30 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Salem, Omega, Stephen Forbes Station, Helm, Tonti, Iuka, Alma, Kell,
Walnut Hill, Cartter, Brubaker and Selmaville.

This includes Interstate 57 in Illinois between exits 109 and 127.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3847 8905 3877 8899 3876 8870 3847 8870
TIME...MOT...LOC 2206Z 270DEG 27KT 3872 8891 3850 8895 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

CVKING

938 
WWUS53 KLSX 102224
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
524 PM CDT Sat Jul 10 2021

ILC121-102233-
/O.EXP.KLSX.SV.W.0134.000000T0000Z-210710T2230Z/
Marion IL-
524 PM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MARION COUNTY WILL
EXPIRE AT 530 PM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Illinois.

LAT...LON 3847 8905 3877 8899 3876 8870 3847 8870
TIME...MOT...LOC 2223Z 272DEG 21KT 3872 8879 3850 8883 

$$

CVKING

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, 1:36 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

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.