Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 109, NWS Lincoln, IL

September 7, 20214 counties in Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Sep 7, 2021, 5:39 PM CDT for 4 counties in Illinois. It was in force for 36 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: Sep 7, 2021, 5:39 PM CDT (22:39 UTC)
Expired: Sep 7, 2021, 6:15 PM CDT
In force: 36 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Champaign County, IL, DeWitt County, IL, McLean County, IL, Piatt County, IL

The radar

The Lincoln radar (KILX), 88 km from the middle of the area, began a volume at 22:41 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
Sep 7, 6:03 PM CDT	TSTM WND DMG	2 Ene Rantoul, IL	A COUPLE POWER LINES DOWN BETWEEN RANTOUL AND GIFFORD. TIME ESTIMATED BY 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
Sep 7, 1:12 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.7 hours before the alert went out and 32 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: 1964 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

996 
WUUS53 KILX 072239
SVRILX
ILC019-039-113-147-072315-
/O.NEW.KILX.SV.W.0109.210907T2239Z-210907T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
539 PM CDT Tue Sep 7 2021

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
  Northeastern Piatt County in central Illinois...
  Northeastern De Witt County in central Illinois...
  Southeastern McLean County in central Illinois...
  Northern Champaign County in east central Illinois...

* Until 615 PM CDT.

* At 538 PM CDT, severe thunderstorms were located along a line
  extending from near Gibson City to near Downs, moving east at 40
  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.

* Severe thunderstorms will be near...
  Rantoul around 555 PM CDT.

Other locations in the path of these severe thunderstorms include
Farmer City, Saybrook, Gifford, Mansfield and Fisher.

This includes the following highways...
 Interstate 57 between mile markers 245 and 257.
 Interstate 74 between mile markers 142 and 166.

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 Lincoln.

&&

LAT...LON 4025 8793 4021 8868 4041 8891 4051 8846
      4040 8846 4040 8794
TIME...MOT...LOC 2238Z 291DEG 34KT 4049 8830 4041 8880 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Geelhart

2 follow-up statements

094 
WWUS53 KILX 072254
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
554 PM CDT Tue Sep 7 2021

ILC019-039-113-147-072315-
/O.CON.KILX.SV.W.0109.000000T0000Z-210907T2315Z/
Piatt-De Witt-McLean-Champaign-
554 PM CDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR NORTHEASTERN PIATT...NORTHEASTERN DE WITT...SOUTHEASTERN MCLEAN
AND NORTHERN CHAMPAIGN COUNTIES...

At 553 PM CDT, severe thunderstorms were located along a line
extending from near Paxton to 6 miles east of Le Roy, moving
southeast at 40 mph.

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

SOURCE...Broadcast media. At 544 PM, damage to trees and power lines 
         was reported in Gibson City, in Ford County. 
         
IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
  Rantoul, Gifford, Fisher and Thomasboro.

This includes the following highways...
 Interstate 57 between mile markers 245 and 257.
 Interstate 74 between mile markers 156 and 166.

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
Lincoln.

&&

LAT...LON 4025 8793 4021 8868 4040 8870 4040 8794
TIME...MOT...LOC 2253Z 300DEG 35KT 4041 8814 4035 8863 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

Geelhart

967 
WWUS53 KILX 072316
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
616 PM CDT Tue Sep 7 2021

ILC019-039-113-147-072324-
/O.EXP.KILX.SV.W.0109.000000T0000Z-210907T2315Z/
Piatt-De Witt-McLean-Champaign-
616 PM CDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEAST PIATT...NORTHEAST 
DE WITT...SOUTHEAST MCLEAN AND FAR NORTHWEST CHAMPAIGN
COUNTIES WILL EXPIRE AT 615 PM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, this portion of the warning will be allowed to expire.

A new Severe Thunderstorm Warning has been issued for the remainder 
of Champaign County until 700 PM. 

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
central and east central Illinois.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Lincoln.

LAT...LON 4025 8793 4021 8868 4040 8870 4040 8794
TIME...MOT...LOC 2314Z 291DEG 34KT 4034 8791 4028 8840 

$$

Geelhart

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 2:55 PM CDT	Special Weather Statement	ILX	Stark	20 min
Sep 7, 3:53 PM CDT	Severe Thunderstorm Warning	ILX	Marshall, Woodford	37 min
Sep 7, 4:22 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Woodford	38 min
Sep 7, 4:58 PM CDT	Severe Thunderstorm Warning	ILX	McLean	47 min
Sep 7, 4:58 PM CDT	Severe Thunderstorm Warning	ILX	McLean	47 min
Sep 7, 6:09 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Vermilion	51 min
Sep 7, 6:30 PM CDT	Special Weather Statement	ILX	Piatt	45 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.