Alert archive / Illinois / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 113, NWS Lincoln, IL

July 21, 2020Champaign County, Vermilion County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 21, 2020, 11:29 AM CDT for Champaign County, Vermilion County, Illinois. It was in force for 61 min. 6 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 21, 2020, 11:29 AM CDT (16:29 UTC)
Expired: Jul 21, 2020, 12:30 PM CDT
In force: 61 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Champaign County, IL, Vermilion County, IL

The radar

The Lincoln radar (KILX), 117 km from the middle of the area, began a volume at 16:33 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 21, 11:30 AM CDT	TSTM WND DMG	E Thomasboro, IL	BARN BLOWN DOWN
Jul 21, 11:30 AM CDT	TSTM WND DMG	Se Thomasboro, IL	MULTIPLE STRUCTURES DAMAGED
Jul 21, 11:34 AM CDT	TSTM WND DMG	Thomasboro, IL	NUMEROUS TREE BRANCHES DOWN, LEANING POWER POLES, POWER OUT IN TOWN.
Jul 21, 11:35 AM CDT	TSTM WND GST 63	1 Ese Rantoul, IL
Jul 21, 12:05 PM CDT	TSTM WND GST 50	Henning, IL	WITH HEAVY RAIN
Jul 21, 12:05 PM CDT	TSTM WND GST 50	Hoopeston, IL	WITH HEAVY RAIN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 4.5 hours before the alert went out and 56 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: 474 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 804 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

550 
WUUS53 KILX 211629
SVRILX
ILC019-183-211730-
/O.NEW.KILX.SV.W.0113.200721T1629Z-200721T1730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
1129 AM CDT Tue Jul 21 2020

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
  Northern Vermilion County in east central Illinois...
  Northeastern Champaign County in east central Illinois...

* Until 1230 PM CDT.

* At 1128 AM CDT, a severe thunderstorm was located over Thomasboro,
  or near Rantoul, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Champaign, Rantoul, Urbana, Hoopeston, Rossville, Thomasboro,
  Gifford, Potomac, Rankin, Bismarck, Ludlow, Royal, Henning,
  Collison, Dewey, Flatville, Middle Fork Wildlife Area, Armstrong,
  Alvin and Penfield.

This includes the following highways...
 Interstate 57 between mile markers 237 and 257.
 Interstate 74 between mile markers 179 and 185.

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 4011 8828 4040 8834 4040 8794 4049 8793
      4049 8753 4021 8753
TIME...MOT...LOC 1628Z 250DEG 35KT 4024 8822 

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

SB

2 follow-up statements

637 
WWUS53 KILX 211704
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
1204 PM CDT Tue Jul 21 2020

ILC019-211713-
/O.CAN.KILX.SV.W.0113.000000T0000Z-200721T1730Z/
Champaign-
1204 PM CDT Tue Jul 21 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHAMPAIGN COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4021 8753 4016 8794 4022 8794 4023 8793
      4049 8793 4049 8753
TIME...MOT...LOC 1703Z 251DEG 44KT 4037 8773 

$$

ILC183-211730-
/O.CON.KILX.SV.W.0113.000000T0000Z-200721T1730Z/
Vermilion-
1204 PM CDT Tue Jul 21 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT
FOR NORTHERN VERMILION COUNTY...

At 1203 PM CDT, a severe thunderstorm was located near Rossville, or
14 miles south of Claytonville, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Hoopeston, Rossville, Potomac, Rankin, Bismarck, Henning, Middle Fork
Wildlife Area, Armstrong, Collison and Alvin.

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 4021 8753 4016 8794 4022 8794 4023 8793
      4049 8793 4049 8753
TIME...MOT...LOC 1703Z 251DEG 44KT 4037 8773 

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

SB

927 
WWUS53 KILX 211727
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
1227 PM CDT Tue Jul 21 2020

ILC183-211737-
/O.EXP.KILX.SV.W.0113.000000T0000Z-200721T1730Z/
Vermilion-
1227 PM CDT Tue Jul 21 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN VERMILION COUNTY WILL
EXPIRE AT 1230 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4021 8753 4016 8794 4022 8794 4023 8793
      4049 8793 4049 8753
TIME...MOT...LOC 1727Z 250DEG 35KT 4045 8745 

$$

SB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 10:27 AM CDT	Special Weather Statement	ILX	DeWitt, Piatt	48 min
Jul 21, 10:48 AM CDT	Severe Thunderstorm Warning	ILX	Champaign, DeWitt, McLean, Piatt	42 min
Jul 21, 11:18 AM CDT	Special Weather Statement	ILX	Champaign, Vermilion	57 min
Jul 21, 12:16 PM CDT	Special Weather Statement	ILX	Coles	44 min
Jul 21, 12:59 PM CDT	Special Weather Statement	ILX	Edgar	46 min
Jul 21, 2:41 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Morgan, Scott	64 min
Jul 21, 3:12 PM CDT	Severe Thunderstorm Warning	ILX	Menard, Sangamon	48 min
Jul 21, 3:45 PM CDT	Severe Thunderstorm Warning	ILX	Morgan, Sangamon	45 min
Jul 21, 4:03 PM CDT	Tornado Warning	ILX	Sangamon	27 min
Jul 21, 4:18 PM CDT	Tornado Warning	ILX	Christian, Sangamon	27 min
Jul 21, 4:39 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Macon, Sangamon, Shelby	44 min
Jul 21, 5:14 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Douglas, Macon, Moultrie, Piatt, Shelby	46 min
Jul 21, 5:25 PM CDT	Tornado Warning	ILX	Champaign, Douglas, Piatt	19 min
Jul 21, 5:55 PM CDT	Special Weather Statement	ILX	Champaign, Coles, Cumberland, Douglas, Edgar	50 min
Jul 21, 6:37 PM CDT	Severe Thunderstorm Warning	ILX	Edgar	38 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2020 Every severe thunderstorm warning in 2020

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.