Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 204, NWS St. Louis, MO

July 7, 2012Monroe County, Illinois; Jefferson County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 7, 2012, 7:58 PM CDT for Monroe County, Illinois; Jefferson County, Missouri. It was in force for 47 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
Jul 7, 2012, 7:58 PM CDT (00:58 UTC)
Expired
Jul 7, 2012, 8:45 PM CDT
In force
47 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Monroe County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 61 km from the middle of the area, began a volume at 00:59 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, 1.0 hours before the alert went out and 254 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 2012-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 199 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 2012-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 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
199 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
2803 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
1 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.

996 
WUUS53 KLSX 080058
SVRLSX
ILC133-MOC099-080145-
/O.NEW.KLSX.SV.W.0204.120708T0058Z-120708T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
758 PM CDT SAT JUL 7 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  EAST CENTRAL JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 845 PM CDT

* AT 755 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR NEW
  DESIGN...AND MOVING NORTHWEST AT 10 MPH.

  HAZARD...60 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
           BROKEN.

* LOCATIONS IMPACTED INCLUDE...
  HERCULANEUM...PEVELY...CRYSTAL CITY...FESTUS...BARNHART...
  VALMEYER...FOUNTAIN...WARTBURG...MAEYSTOWN...CHALFIN BRIDGE...
  MADONNAVILLE...FOSTER POND...MONROE CITY...HARRISONVILLE...
  KIMMSWICK AND HEMATITE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3811 9014 3810 9017 3819 9049 3840 9036
      3840 9034 3839 9034 3839 9033 3828 9004
TIME...MOT...LOC 0058Z 114DEG 8KT 3824 9020

HAIL...<.75IN
WIND...60 MPH

$$

KANOFSKY
1 follow-up statement
341 
WWUS53 KLSX 080142
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
842 PM CDT SAT JUL 7 2012

ILC133-MOC099-080152-
/O.EXP.KLSX.SV.W.0204.000000T0000Z-120708T0145Z/
MONROE IL-JEFFERSON MO-
842 PM CDT SAT JUL 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL JEFFERSON AND
SOUTHERN MONROE COUNTIES WILL EXPIRE AT 845 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3811 9014 3810 9017 3819 9049 3840 9036
      3840 9034 3839 9034 3839 9033 3828 9004
TIME...MOT...LOC 0142Z 114DEG 8KT 3828 9031

$$

KANOFSKY

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 7:06 PM CDTSevere Thunderstorm WarningLSXMonroe32 min
Jul 7, 8:40 PM CDTSevere Thunderstorm WarningLSXSaint Clair50 min
Jul 8, 2:29 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Marion46 min
Jul 8, 5:03 PM CDTSevere Thunderstorm WarningLSXRandolph42 min
Jul 8, 5:42 PM CDTSevere Thunderstorm WarningLSXRandolph48 min
Jul 8, 5:44 PM CDTSevere Thunderstorm WarningLSXMonroe46 min
Jul 8, 5:57 PM CDTSevere Thunderstorm WarningLSXSaint Clair27 min
Jul 8, 6:49 PM CDTSevere Thunderstorm WarningLSXSaint Clair41 min
Jul 7, 7:03 PM CDTSevere Thunderstorm WarningLSXSaint Louis42 min
Jul 7, 7:10 PM CDTSevere Thunderstorm WarningLSXIron, Saint Francois, Washington39 min
Jul 7, 7:18 PM CDTSevere Thunderstorm WarningLSXJefferson, Saint Louis27 min
Jul 7, 8:49 PM CDTSevere Thunderstorm WarningLSXWashington26 min
Jul 8, 1:36 PM CDTSevere Thunderstorm WarningLSXOsage39 min
Jul 8, 2:10 PM CDTSevere Thunderstorm WarningLSXOsage28 min
Jul 8, 3:41 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Washington49 min
Jul 8, 3:53 PM CDTSevere Thunderstorm WarningLSXFranklin37 min
Jul 8, 4:24 PM CDTSevere Thunderstorm WarningLSXFranklin19 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2012Severe Thunderstorm Warnings in Missouri, 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.