Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 129, NWS St. Louis, MO

April 28, 2012Monroe County, Randolph County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 9:05 PM CDT for Monroe County, Randolph County, Saint Clair County, Illinois. It was in force for 33 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 28, 2012, 9:05 PM CDT (02:05 UTC)
Expired
Apr 28, 2012, 9:38 PM CDT
In force
33 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.5 in
Wind
50.0 mph

Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL

The radar

The St Louis radar (KLSX), 79 km from the middle of the area, began a volume at 02:08 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 28, 9:17 PM CDTHAIL 0.53 S Hecker, IL
Apr 28, 9:20 PM CDTHAIL 0.881 N Red Bud, ILHAIL COVERING GROUND.

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 28, 5:15 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.1 hours before the alert went out and 237 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 2012-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
545 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
141 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

921 
WUUS53 KLSX 290205
SVRLSX
ILC133-157-163-290245-
/O.NEW.KLSX.SV.W.0129.120429T0205Z-120429T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
905 PM CDT SAT APR 28 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  NORTH CENTRAL RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 945 PM CDT

* AT 903 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR NEW
  DESIGN...AND MOVING EAST AT 30 MPH.

  HAZARD...PING PONG BALL SIZE HAIL.

  SOURCE...TRAINED WEATHER SPOTTERS.

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

  PING PONG BALL SIZE HAIL WAS REPORTED IN WARTBURG WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  RED BUD...NEW ATHENS...BALDWIN...FLORAVILLE...PADERBORN...HECKER...
  PRAIRIE AND LENZBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3834 8974 3812 8984 3823 9023 3841 9016
TIME...MOT...LOC 0205Z 285DEG 26KT 3827 9010

HAIL...1.50IN
WIND...<50 MPH

$$

KANOFSKY
2 follow-up statements
724 
WWUS53 KLSX 290216
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
916 PM CDT SAT APR 28 2012

ILC133-157-163-290245-
/O.CON.KLSX.SV.W.0129.000000T0000Z-120429T0245Z/
MONROE IL-RANDOLPH IL-ST. CLAIR IL-
916 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN ST.
CLAIR...NORTH CENTRAL RANDOLPH AND EAST CENTRAL MONROE COUNTIES UNTIL
945 PM CDT...

AT 913 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR RED BUD...AND
MOVING EAST AT 30 MPH.

HAZARD...PING PONG BALL SIZE HAIL.

SOURCE...TRAINED WEATHER SPOTTERS.

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

LOCATIONS IMPACTED INCLUDE...
RED BUD...NEW ATHENS...BALDWIN...PRAIRIE AND LENZBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3820 9012 3840 9007 3834 8974 3812 8984
TIME...MOT...LOC 0217Z 285DEG 26KT 3825 8999

HAIL...1.50IN
WIND...<50 MPH

$$

KANOFSKY
127 
WWUS53 KLSX 290238
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
938 PM CDT SAT APR 28 2012

ILC133-157-163-290249-
/O.CAN.KLSX.SV.W.0129.000000T0000Z-120429T0245Z/
MONROE IL-RANDOLPH IL-ST. CLAIR IL-
938 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ST. CLAIR...NORTH
CENTRAL RANDOLPH AND EAST CENTRAL MONROE COUNTIES IS CANCELLED...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 10 PM CDT.

LAT...LON 3820 9012 3840 9007 3834 8974 3812 8984
TIME...MOT...LOC 0239Z 285DEG 26KT 3821 8979

$$

KANOFSKY

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 7:41 PM CDTAreal Flood AdvisoryLSXClinton, Saint Clair, Washington6 hr
Apr 28, 8:12 PM CDTSevere Thunderstorm WarningLSXMonroe48 min
Apr 28, 8:39 PM CDTSevere Thunderstorm WarningLSXMonroe36 min
Apr 28, 9:31 PM CDTSevere Thunderstorm WarningLSXRandolph, Saint Clair, Washington33 min
Apr 28, 10:01 PM CDTSevere Thunderstorm WarningLSXBond, Macoupin, Madison, Montgomery34 min
Apr 28, 10:25 PM CDTSevere Thunderstorm WarningLSXMacoupin, Montgomery28 min
Apr 29, 1:44 AM CDTSevere Thunderstorm WarningLSXMadison46 min
Apr 29, 4:59 AM CDTSevere Thunderstorm WarningLSXCalhoun46 min
Apr 29, 5:32 AM CDTSevere Thunderstorm WarningLSXGreene, Jersey36 min
Apr 29, 7:54 AM CDTFlash Flood WarningLSXMacoupin, Montgomery6 hr
Apr 29, 7:58 AM CDTSevere Thunderstorm WarningLSXMontgomery20 min
Apr 29, 4:00 PM CDTFlash Flood WatchLSXBond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more15 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.