Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 100, NWS St. Louis, MO

April 25, 2012Bond County, Madison County, Montgomery County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 25, 2012, 11:44 PM CDT for Bond County, Madison County, Montgomery County, Illinois. It was in force for 46 min. 2 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
Apr 25, 2012, 11:44 PM CDT (04:44 UTC)
Expired
Apr 26, 2012, 12:30 AM CDT
In force
46 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.75 in
Wind
50.0 mph

Counties Bond County, IL, Madison County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 94 km from the middle of the area, began a volume at 04:46 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
Apr 25, 11:59 PM CDTHAIL 0.75Livingston, IL
Apr 26, 12:00 AM CDTHAIL 0.753 Sw Alhambra, IL

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.

IssuedProductOfficeLasted
Apr 25, 7:47 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.7 hours before the alert went out and 166 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 2012-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1745 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2012-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 261 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
1745 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
1353 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
261 m²/s²
0-3 km storm-relative helicity
449 m²/s²
Significant tornado parameter
1.2
Supercell composite
4.2

Open this sounding in Storm Lab

The text

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

209 
WUUS53 KLSX 260444
SVRLSX
ILC005-119-135-260530-
/O.NEW.KLSX.SV.W.0100.120426T0444Z-120426T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1144 PM CDT WED APR 25 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BOND COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHWESTERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 1230 AM CDT

* AT 1141 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BUNKER
  HILL...AND MOVING SOUTHEAST AT 50 MPH.

  HAZARD...GOLF BALL SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

* LOCATIONS IMPACTED INCLUDE...
  GREENVILLE...WORDEN...LIVINGSTON...ALHAMBRA...SORENTO...RENO...
  POCAHONTAS...BEAVER CREEK...TAMALCO...WILLIAMSON...HAMEL...
  WALSHVILLE...KAUFMAN...NEW DOUGLAS...SHILOH HILL...GRANTFORK...OLD
  RIPLEY...PIERRON...DUDLEYVILLE AND SMITHBORO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3874 8972 3900 9001 3900 8970 3913 8970
      3885 8926 3875 8926
TIME...MOT...LOC 0444Z 303DEG 43KT 3903 8987

HAIL...1.75IN
WIND...<50 MPH

$$

CVKING
2 follow-up statements
531 
WWUS53 KLSX 260458
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1158 PM CDT WED APR 25 2012

ILC135-260508-
/O.CAN.KLSX.SV.W.0100.000000T0000Z-120426T0530Z/
MONTGOMERY IL-
1158 PM CDT WED APR 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MONTGOMERY COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3874 8972 3900 9001 3900 8959 3885 8926
      3875 8926
TIME...MOT...LOC 0458Z 303DEG 43KT 3894 8969

$$

ILC005-119-260530-
/O.CON.KLSX.SV.W.0100.000000T0000Z-120426T0530Z/
MADISON IL-BOND IL-
1158 PM CDT WED APR 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BOND AND
NORTHEASTERN MADISON COUNTIES UNTIL 1230 AM CDT...

AT 1155 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR LIVINGSTON...
AND MOVING SOUTHEAST AT 50 MPH.

HAZARD...GOLF BALL SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

LOCATIONS IMPACTED INCLUDE...
GREENVILLE...RENO...POCAHONTAS...BEAVER CREEK...TAMALCO...SHILOH
HILL...GRANTFORK...OLD RIPLEY...PIERRON AND DUDLEYVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3874 8972 3900 9001 3900 8959 3885 8926
      3875 8926
TIME...MOT...LOC 0458Z 303DEG 43KT 3894 8969

HAIL...1.75IN
WIND...<50 MPH

$$

CVKING
327 
WWUS53 KLSX 260512
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1212 AM CDT THU APR 26 2012

ILC005-119-260530-
/O.CON.KLSX.SV.W.0100.000000T0000Z-120426T0530Z/
MADISON IL-BOND IL-
1212 AM CDT THU APR 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN BOND
AND EAST CENTRAL MADISON COUNTIES UNTIL 1230 AM CDT...

AT 1209 AM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM GREENVILLE TO MARINE...AND MOVING SOUTHEAST AT 45
MPH.

HAZARD...HALF DOLLAR SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

LOCATIONS IMPACTED INCLUDE...
GREENVILLE...POCAHONTAS...BEAVER CREEK...TAMALCO...DUDLEYVILLE AND
PIERRON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3874 8972 3889 8989 3895 8948 3885 8926
      3875 8926
TIME...MOT...LOC 0512Z 304DEG 40KT 3890 8940 3880 8972

HAIL...1.25IN
WIND...<50 MPH

$$

CVKING

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 25, 8:21 PM CDTSevere Thunderstorm WarningLSXAdams54 min
Apr 25, 9:13 PM CDTSevere Thunderstorm WarningLSXAdams, Brown, Pike62 min
Apr 25, 9:50 PM CDTSevere Thunderstorm WarningLSXPike40 min
Apr 25, 10:21 PM CDTSevere Thunderstorm WarningLSXGreene, Pike39 min
Apr 25, 10:53 PM CDTSevere Thunderstorm WarningLSXGreene, Jersey, Macoupin67 min
Apr 25, 11:38 PM CDTSevere Thunderstorm WarningLSXFayette37 min
Apr 25, 11:55 PM CDTSevere Thunderstorm WarningLSXMadison50 min
Apr 26, 12:18 AM CDTSevere Thunderstorm WarningLSXClinton, Madison42 min
Apr 26, 12:45 AM CDTSevere Thunderstorm WarningLSXWashington45 min
Apr 26, 2:06 AM CDTSevere Thunderstorm WarningLSXFayette, Marion28 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.