Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 87, NWS Lincoln, IL

August 12, 2021Christian County, Macon County, Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 12, 2021, 2:43 PM CDT for Christian County, Macon County, Sangamon County, Illinois. It was in force for 47 min. 18 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
Aug 12, 2021, 2:43 PM CDT (19:43 UTC)
Expired
Aug 12, 2021, 3:30 PM CDT
In force
47 min
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Christian County, IL, Macon County, IL, Sangamon County, IL

The radar

The Lincoln radar (KILX), 47 km from the middle of the area, began a volume at 19:44 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

TimeReportWhereRemark
Aug 12, 2:44 PM CDTTSTM WND DMG1 Ene Southern View, ILTREE LIMB DOWN ON NORTH SIDE OF INTERSTATE.
Aug 12, 2:44 PM CDTTSTM WND DMG1 Nne Grandview, ILTREE LIMB DOWN. TIME ESTIMATED FROM RADAR.
Aug 12, 2:47 PM CDTTSTM WND DMG1 S Riverton, IL16 IN DIAMETER HEALTHY TREE SNAPPED. SEVERAL BRANCHES DOWN IN THE SAME AREA AS WELL. TIME ESTIMATED FROM RADAR.
Aug 12, 2:47 PM CDTTSTM WND DMG1 S Springfield, IL16 IN DIAMETER HEALTHY TREE SNAPPED. SEVERAL BRANCHES DOWN IN THE SAME AREA AS WELL. TIME ESTIMATED FROM RADAR.
Aug 12, 2:48 PM CDTTSTM WND DMG2 Nw Grandview, ILPOWER POLE SNAPPED AND TENTS DAMAGED AT STATE FAIRGROUNDS
Aug 12, 2:48 PM CDTTSTM WND DMG3 E Chatham, ILLARGE TREE DOWN IN BRIDGEVIEW PARK.
Aug 12, 2:48 PM CDTTSTM WND DMG3 E Chatham, ILLARGE TREE LIMB 1.5 FT IN DIAMETER BLOWN DOWN ON LAKEWOOD DR NEAR SUGAR CREEK STABLES.
Aug 12, 2:48 PM CDTTSTM WND DMG3 S Southern View, ILLARGE TREE SPLIT AND BLOWN DOWN SOUTH OF TORONTO RD ON NORTH COTTON HILL RD.
Aug 12, 2:48 PM CDTTSTM WND GST 602 Nw Grandview, IL
Aug 12, 3:01 PM CDTTSTM WND DMG1 E Grandview, ILPOWER OUTAGES REPORTED.
Aug 12, 3:06 PM CDTTSTM WND DMGRiverton, ILTREES UPROOTED, EXTENSIVE TREE DAMAGE
Aug 12, 3:06 PM CDTTSTM WND DMGRiverton, ILTREES UPROOTED, EXTENSIVE TREE DAMAGE.
Aug 12, 3:10 PM CDTTSTM WND DMGStonington, ILA FEW TREES BROKEN IN TWO, SEVERAL LIMBS DOWN. WEATHER STATION RECORDED GUSTS OF 50 TO 75 MPH.
Aug 12, 3:10 PM CDTTSTM WND GST 58Taylorville, ILPERSONAL WEATHER EQUIPMENT READ 58 MPH BEFORE FAILING.
Aug 12, 3:15 PM CDTTSTM WND DMG1 Nw Taylorville, ILBRANCHES DOWN NORTH SILVER ST 800 BLOCK BLOCKING ROAD.
Aug 12, 3:16 PM CDTTSTM WND GST 70Taylorville Airport, IL
Aug 12, 3:20 PM CDTTSTM WND GST 70Taylorville, ILTRAINED SPOTTER REPORTED 70-75 MPH WIND GUSTS.
Aug 12, 3:27 PM CDTTSTM WND DMG3 E Chatham, ILSEVERAL LARGE TREE BRANCHES DOWN AND POWER OUTAGE. TIME ESTIMATED FROM RADAR.

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, 7.7 hours before the alert went out and 91 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2021-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1191 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2021-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1191 J/kg
Mixed-layer CIN
-177 J/kg
Mixed-layer LCL
1149 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.1

Open this sounding in Storm Lab

The text

As transmitted.

823 
WUUS53 KILX 121943
SVRILX
ILC021-115-167-122030-
/O.NEW.KILX.SV.W.0087.210812T1943Z-210812T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
243 PM CDT Thu Aug 12 2021

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
  Central Christian County in central Illinois...
  Central Sangamon County in central Illinois...
  Southwestern Macon County in central Illinois...

* Until 330 PM CDT.

* At 243 PM CDT, a severe thunderstorm was located over Rochester, or
  near Springfield, moving southeast at 30 mph.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Mechanicsburg around 250 PM CDT.

Other locations in the path of this severe thunderstorm include
Edinburg, Kincaid, Bulpitt, Jeisyville, Taylorville and Stonington.

This includes the following highways...
 Interstate 55 between mile markers 88 and 107.
 Interstate 72 between mile markers 93 and 120.

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 3981 8981 3996 8961 3975 8906 3942 8935
TIME...MOT...LOC 1943Z 309DEG 27KT 3977 8956 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SB
2 follow-up statements
270 
WWUS53 KILX 122000
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
300 PM CDT Thu Aug 12 2021

ILC021-115-167-122030-
/O.CON.KILX.SV.W.0087.000000T0000Z-210812T2030Z/
Christian-Sangamon-Macon-
300 PM CDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR CENTRAL CHRISTIAN...EASTERN SANGAMON AND SOUTHWESTERN MACON
COUNTIES...

At 300 PM CDT, a severe thunderstorm was located near Edinburg, or 
12 miles southeast of Springfield, moving southeast at 30 mph.

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

SOURCE...Trained weather spotters.

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

Locations impacted include...
  Edinburg, Kincaid, Bulpitt, Jeisyville, Taylorville and 
  Stonington.

This includes the following highways...
 Interstate 55 between mile markers 88 and 97.
 Interstate 72 between mile markers 97 and 120.

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 3972 8970 3990 8946 3975 8906 3942 8935
TIME...MOT...LOC 2000Z 309DEG 27KT 3969 8943 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SB
056 
WWUS53 KILX 122032
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
332 PM CDT Thu Aug 12 2021

ILC021-115-167-122042-
/O.EXP.KILX.SV.W.0087.000000T0000Z-210812T2030Z/
Christian-Sangamon-Macon-
332 PM CDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CHRISTIAN...EASTERN
SANGAMON AND SOUTHWESTERN MACON COUNTIES HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3972 8970 3990 8946 3975 8906 3942 8935
TIME...MOT...LOC 2032Z 309DEG 27KT 3954 8920 

$$

37

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 2:45 AM CDTHeat AdvisoryILXCass, Champaign, Christian, Clark, Clay, Coles and 22 more15 hr
Aug 12, 2:59 AM CDTSpecial Weather StatementILXMcLean46 min
Aug 12, 3:14 AM CDTSevere Thunderstorm WarningILXMcLean31 min
Aug 12, 3:51 AM CDTSpecial Weather StatementILXMcLean24 min
Aug 12, 4:02 AM CDTSpecial Weather StatementILXTazewell43 min
Aug 12, 4:26 AM CDTSevere Thunderstorm WarningILXLogan, McLean, Tazewell21 min
Aug 12, 8:12 AM CDTSpecial Weather StatementILXMcLean48 min
Aug 12, 9:13 AM CDTSevere Thunderstorm WarningILXChampaign, McLean47 min
Aug 12, 9:24 AM CDTAreal Flood AdvisoryILXDeWitt, McLean, Piatt3 hr
Aug 12, 10:04 AM CDTFlash Flood WarningILXChampaign, McLean5 hr
Aug 12, 10:52 AM CDTSevere Thunderstorm WarningILXChampaign38 min
Aug 12, 11:17 AM CDTFlash Flood WarningILXChampaign, DeWitt, Piatt3 hr
Aug 12, 11:26 AM CDTSpecial Weather StatementILXFulton, Tazewell49 min
Aug 12, 12:16 PM CDTSpecial Weather StatementILXLogan44 min
Aug 12, 1:05 PM CDTSpecial Weather StatementILXVermilion40 min
Aug 12, 1:45 PM CDTSpecial Weather StatementILXChampaign, Piatt45 min
Aug 12, 2:16 PM CDTFlash Flood WarningILXChampaign, DeWitt, Piatt119 min
Aug 12, 2:23 PM CDTSpecial Weather StatementILXChampaign52 min
Aug 12, 2:35 PM CDTSpecial Weather StatementILXChristian, Morgan, Sangamon25 min
Aug 12, 2:53 PM CDTSevere Thunderstorm WarningILXVermilion37 min
Aug 12, 3:01 PM CDTAreal Flood WarningILXChampaign, McLean6 hr
Aug 12, 3:08 PM CDTSevere Thunderstorm WarningILXChristian, Macon, Moultrie, Shelby52 min
Aug 12, 3:43 PM CDTSevere Thunderstorm Warning Considerable damage threatILXColes, Cumberland, Effingham, Moultrie, Shelby47 min
Aug 12, 4:15 PM CDTFlash Flood WarningILXDouglas, Moultrie, Shelby3 hr
Aug 12, 4:29 PM CDTSevere Thunderstorm WarningILXClark, Crawford, Cumberland, Effingham, Jasper, Shelby46 min
Aug 12, 5:09 PM CDTSevere Thunderstorm WarningILXClark, Crawford, Jasper36 min
Aug 12, 5:28 PM CDTSpecial Weather StatementILXScott32 min
Aug 12, 5:30 PM CDTSevere Thunderstorm WarningILXCass, Morgan, Scott18 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021Every 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.