Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 129, NWS Lincoln, IL

September 21, 2012Coles County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Sep 21, 2012, 7:09 PM CDT for Coles County, Illinois. It was in force for 36 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
Sep 21, 2012, 7:09 PM CDT (00:09 UTC)
Expired
Sep 21, 2012, 7:45 PM CDT
In force
36 min
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Coles County, IL

The radar

The Lincoln radar (KILX), 123 km from the middle of the area, began a volume at 00:10 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 00:00Z, 0.2 hours before the alert went out and 85 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 00:00Z on 2012-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 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 00:00Z on 2012-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.1939587897Sfc1 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
11 J/kg
Mixed-layer CIN
-153 J/kg
Mixed-layer LCL
1083 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

701 
WUUS53 KILX 220009
SVRILX
ILC029-220045-
/O.NEW.KILX.SV.W.0129.120922T0009Z-120922T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
709 PM CDT FRI SEP 21 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN COLES COUNTY IN EAST CENTRAL ILLINOIS...

* UNTIL 745 PM CDT.

* AT 706 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  MATTOON...AND MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CHARLESTON...LERNA...COLES COUNTY AIRPORT...FOX RIDGE STATE PARK
  AND HUTTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3939 8840 3951 8838 3951 8802 3938 8802
TIME...MOT...LOC 0009Z 273DEG 32KT 3944 8831
WIND...HAIL 60MPH 1.00IN

$$

SMITH
2 follow-up statements
845 
WWUS53 KILX 220020
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
720 PM CDT FRI SEP 21 2012

ILC029-220045-
/O.CON.KILX.SV.W.0129.000000T0000Z-120922T0045Z/
COLES IL-
720 PM CDT FRI SEP 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
COLES COUNTY UNTIL 745 PM CDT...

AT 719 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
CHARLESTON...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  FOX RIDGE STATE PARK AND HUTTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3939 8825 3949 8826 3951 8802 3938 8802
TIME...MOT...LOC 0020Z 273DEG 32KT 3943 8818
WIND...HAIL 60MPH 1.00IN

$$

SMITH
621 
WWUS53 KILX 220043
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
743 PM CDT FRI SEP 21 2012

ILC029-220053-
/O.EXP.KILX.SV.W.0129.000000T0000Z-120922T0045Z/
COLES IL-
743 PM CDT FRI SEP 21 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL COLES COUNTY
WILL EXPIRE AT 745 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.  HOWEVER SMALL HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH 
ADDITIONAL THUNDERSTORMS MOVING ACROSS SOUTHERN COLES COUNTY.

LAT...LON 3939 8825 3949 8826 3951 8802 3938 8802
TIME...MOT...LOC 0043Z 273DEG 32KT 3942 8792

$$

SMITH

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 21, 7:04 PM CDTSpecial Weather StatementILXColes41 min
Sep 21, 7:47 PM CDTSpecial Weather StatementILXClark28 min
Sep 21, 7:49 PM CDTSevere Thunderstorm WarningILXClark26 min
Sep 21, 9:20 PM CDTSpecial Weather StatementILXLawrence55 min
Sep 22, 3:03 AM CDTFreeze WatchILXFulton, Knox, Stark12 hr
Sep 22, 3:22 PM CDTFrost AdvisoryILXCass, Champaign, DeWitt, Fulton, Knox, Logan and 15 more17 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2012Every severe thunderstorm warning in 2012

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.