Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 151, NWS St. Louis, MO

May 4, 2012Bond County, Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 4, 2012, 10:18 PM CDT for Bond County, Madison County, Illinois. It was in force for 42 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
May 4, 2012, 10:18 PM CDT (03:18 UTC)
Expired
May 4, 2012, 11:00 PM CDT
In force
42 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Bond County, IL, Madison County, IL

The radar

The St Louis radar (KLSX), 88 km from the middle of the area, began a volume at 03:19 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
May 4, 10:22 PM CDTHAIL 0.751 Se Carpenter, IL

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 00:00Z, 3.3 hours before the alert went out and 168 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 2012-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 188 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 2012-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 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
188 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
1330 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
155 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.

887 
WUUS53 KLSX 050318
SVRLSX
ILC005-119-050400-
/O.NEW.KLSX.SV.W.0151.120505T0318Z-120505T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1018 PM CDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1100 PM CDT

* AT 1014 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  CARPENTER...AND MOVING EAST AT 20 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

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

* LOCATIONS IMPACTED INCLUDE...
  WORDEN...MARINE...LIVINGSTON...ALHAMBRA...POCAHONTAS...RENO...
  HAMEL...KAUFMAN...GRANTFORK...NEW DOUGLAS...SHILOH HILL...OLD
  RIPLEY AND PIERRON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3901 8952 3875 8953 3878 8995 3896 8996
TIME...MOT...LOC 0318Z 269DEG 16KT 3888 8987

HAIL...1.00IN
WIND...<50 MPH

$$

GLASS
2 follow-up statements
090 
WWUS53 KLSX 050335
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1035 PM CDT FRI MAY 4 2012

ILC005-119-050400-
/O.CON.KLSX.SV.W.0151.000000T0000Z-120505T0400Z/
MADISON IL-BOND IL-
1035 PM CDT FRI MAY 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN BOND
AND NORTHEASTERN MADISON COUNTIES UNTIL 1100 PM CDT...

AT 1033 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ALHAMBRA...
AND MOVING EAST AT 20 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

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

LOCATIONS IMPACTED INCLUDE...
LIVINGSTON...ALHAMBRA...POCAHONTAS...SORENTO...GRANTFORK...NEW
DOUGLAS...SHILOH HILL...OLD RIPLEY AND PIERRON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3875 8953 3878 8988 3897 8986 3901 8952
TIME...MOT...LOC 0335Z 269DEG 16KT 3888 8977

HAIL...1.00IN
WIND...<50 MPH

$$

GLASS
721 
WWUS53 KLSX 050355
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1055 PM CDT FRI MAY 4 2012

ILC005-119-050405-
/O.EXP.KLSX.SV.W.0151.000000T0000Z-120505T0400Z/
MADISON IL-BOND IL-
1055 PM CDT FRI MAY 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN BOND AND NORTHEASTERN
MADISON COUNTIES WILL EXPIRE AT 1100 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM.

LAT...LON 3875 8953 3878 8988 3897 8986 3901 8952
TIME...MOT...LOC 0355Z 269DEG 16KT 3888 8966

$$

GLASS

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.