Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 107, NWS St. Louis, MO

June 26, 2021Greene County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 26, 2021, 2:09 PM CDT for Greene County, Illinois. It was in force for 51 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: Jun 26, 2021, 2:09 PM CDT (19:09 UTC)
Expired: Jun 26, 2021, 3:00 PM CDT
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Greene County, IL

The radar

The St Louis radar (KLSX), 78 km from the middle of the area, began a volume at 19:10 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.2 hours before the alert went out and 178 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: 683 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 684 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

265 
WUUS53 KLSX 261909
SVRLSX
ILC061-262015-
/O.NEW.KLSX.SV.W.0107.210626T1909Z-210626T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
209 PM CDT Sat Jun 26 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Greene County in southwestern Illinois...

* Until 315 PM CDT.

* At 208 PM CDT, severe thunderstorms were located along a line
  extending from 8 miles east of Belleview to near Hardin, moving
  northeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  White Hall, Carrollton, Roodhouse, Greenfield and Athensville.

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.

&&

LAT...LON 3952 9015 3929 9015 3924 9060 3925 9061
      3929 9060 3936 9062 3952 9054
TIME...MOT...LOC 1908Z 241DEG 29KT 3938 9063 3922 9067 

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

CVKING

3 follow-up statements

704 
WWUS53 KLSX 261930
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
230 PM CDT Sat Jun 26 2021

ILC061-262015-
/O.CON.KLSX.SV.W.0107.000000T0000Z-210626T2015Z/
Greene IL-
230 PM CDT Sat Jun 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR NORTHERN GREENE COUNTY...

At 230 PM CDT, severe thunderstorms were located along a line
extending from Roodhouse to near Carrollton, moving northeast at 40
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
White Hall, Carrollton, Roodhouse, Greenfield, Athensville, Wrights,
Woody, Belltown, Berdan and Barrow.

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.

&&

LAT...LON 3952 9015 3929 9015 3925 9052 3952 9043
TIME...MOT...LOC 1930Z 243DEG 33KT 3950 9039 3927 9047 

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

CVKING

036 
WWUS53 KLSX 261937
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
237 PM CDT Sat Jun 26 2021

ILC061-262015-
/O.CON.KLSX.SV.W.0107.000000T0000Z-210626T2015Z/
Greene IL-
237 PM CDT Sat Jun 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR NORTHEASTERN GREENE COUNTY...

At 237 PM CDT, a severe thunderstorm was located near White Hall,
moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Athensville and Wrights. 

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. This storm may cause serious injury and significant
property damage.

&&

LAT...LON 3952 9015 3943 9015 3935 9034 3940 9041
      3952 9030
TIME...MOT...LOC 1937Z 239DEG 34KT 3941 9033 

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

CVKING

534 
WWUS53 KLSX 262000
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
300 PM CDT Sat Jun 26 2021

ILC061-262010-
/O.CAN.KLSX.SV.W.0107.000000T0000Z-210626T2015Z/
Greene IL-
300 PM CDT Sat Jun 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GREENE COUNTY IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However heavy rain is still possible with this
thunderstorm.

LAT...LON 3952 9015 3943 9015 3935 9034 3940 9041
      3952 9030
TIME...MOT...LOC 1959Z 241DEG 29KT 3950 9012 

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 7:15 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Pike	45 min
Jun 25, 7:32 PM CDT	Flash Flood Warning	LSX	Adams, Pike	6 hr
Jun 25, 9:29 PM CDT	Flash Flood Warning	LSX	Calhoun, Greene, Jersey	6 hr
Jun 26, 1:25 AM CDT	Areal Flood Warning	LSX	Adams, Pike	14 hr
Jun 26, 3:29 AM CDT	Areal Flood Warning	LSX	Calhoun, Greene, Jersey	9 hr
Jun 26, 11:44 AM CDT	River Flood Warning	LSX	Madison	7 days
Jun 26, 12:13 PM CDT	River Flood Warning	LSX	Jackson, Randolph	9 days
Jun 26, 1:22 PM CDT	Tornado Warning	LSX	Greene	15 min
Jun 26, 1:37 PM CDT	Tornado Warning	LSX	Calhoun	38 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.