Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 79, NWS Lincoln, IL

July 29, 2021Lawrence County, Richland County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 29, 2021, 9:16 PM CDT for Lawrence County, Richland County, Illinois. It was in force for 29 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: Jul 29, 2021, 9:16 PM CDT (02:16 UTC)
Expired: Jul 29, 2021, 9:45 PM CDT
In force: 29 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lawrence County, IL, Richland County, IL

The radar

The Evansville,IN radar (KVWX), 46 km from the middle of the area, began a volume at 02:17 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 00:00Z, 2.3 hours before the alert went out and 177 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: 1257 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1185 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.1

Open this sounding in Storm Lab

The text

As transmitted.

891 
WUUS53 KILX 300216
SVRILX
ILC101-159-300245-
/O.NEW.KILX.SV.W.0079.210730T0216Z-210730T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
916 PM CDT Thu Jul 29 2021

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
  Southwestern Lawrence County in southeastern Illinois...
  Southeastern Richland County in southeastern Illinois...

* Until 945 PM CDT.

* At 916 PM CDT, a severe thunderstorm was located near Sumner, or 9
  miles southwest of Lawrenceville, moving south at 20 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will remain over mainly rural areas of
  southwestern Lawrence and southeastern Richland Counties, including
  the following locations... Berryville, Helena and Mount Carmel
  Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3871 8798 3874 8774 3857 8769 3857 8799
TIME...MOT...LOC 0216Z 356DEG 16KT 3867 8786 

HAIL...1.00IN
WIND...60MPH
 
$$

37

2 follow-up statements

887 
WWUS53 KILX 300235
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
935 PM CDT Thu Jul 29 2021

ILC101-159-300245-
/O.CON.KILX.SV.W.0079.000000T0000Z-210730T0245Z/
Lawrence-Richland-
935 PM CDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR SOUTHWESTERN LAWRENCE AND SOUTHEASTERN RICHLAND COUNTIES...

At 934 PM CDT, a severe thunderstorm was located over Lancaster, or
12 miles north of Mount Carmel, moving south at 20 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Berryville and Helena. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3866 8798 3864 8780 3857 8777 3857 8799
TIME...MOT...LOC 0234Z 356DEG 16KT 3859 8785 

HAIL...1.00IN
WIND...60MPH
 
$$

37

857 
WWUS53 KILX 300245
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
945 PM CDT Thu Jul 29 2021

ILC101-159-300255-
/O.EXP.KILX.SV.W.0079.000000T0000Z-210730T0245Z/
Lawrence-Richland-
945 PM CDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LAWRENCE AND
SOUTHEASTERN RICHLAND COUNTIES HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.  However small hail, gusty winds and heavy
rain are still possible with this thunderstorm.

LAT...LON 3866 8798 3864 8780 3857 8777 3857 8799
TIME...MOT...LOC 0245Z 356DEG 16KT 3855 8785 

$$

37

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 7:28 PM CDT	Severe Thunderstorm Warning	ILX	Crawford, Lawrence	35 min
Jul 29, 8:33 PM CDT	Special Weather Statement	ILX	Lawrence	27 min
Jul 29, 8:57 PM CDT	Special Weather Statement	ILX	Lawrence	33 min
Jul 29, 9:30 PM CDT	Severe Thunderstorm Warning	ILX	Richland	15 min
Jul 29, 10:40 PM CDT	Special Weather Statement	ILX	Richland	35 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.