Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 232, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 4, 2012, 10:59 PM CDT for Jefferson County, Sainte Genevieve County, Missouri; Monroe County, Randolph County, Saint Clair 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
- Aug 4, 2012, 10:59 PM CDT (03:59 UTC)
- Expired
- Aug 4, 2012, 11:45 PM CDT
- In force
- 46 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Jefferson County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 04:01 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 4, 11:26 PM CDT | TSTM WND DMG | 4 Nw Ellis Grove, IL | SEVERAL LIMBS AND POWER LINES BLOWN DOWN. |
| Aug 4, 11:35 PM CDT | TSTM WND DMG | Ruma, IL | HIGH WINDS SNAPPED POWER POLE... AND BLEW LARGE LIMB OFF AN OAK TREE. DELAYED REPORT |
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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 4, 6:12 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 4.0 hours before the alert went out and 252 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.
- Mixed-layer CAPE
- 857 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1700 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.0
The text
As transmitted, in the capitals the NWS used until 2016.
019
WUUS53 KLSX 050359
SVRLSX
ILC133-157-163-MOC099-186-050445-
/O.NEW.KLSX.SV.W.0232.120805T0359Z-120805T0445Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1059 PM CDT SAT AUG 4 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MONROE COUNTY IN SOUTHWEST ILLINOIS...
NORTHWESTERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
SOUTH CENTRAL ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
SOUTHEASTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
NORTHWESTERN STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
* UNTIL 1145 PM CDT
* AT 1056 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR FESTUS...
AND MOVING EAST AT 25 MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...TRAINED WEATHER SPOTTERS REPORTING 55 MPH WINDS.
IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
BROKEN.
* LOCATIONS IMPACTED INCLUDE...
HERCULANEUM...CRYSTAL CITY...WATERLOO...RED BUD...VALMEYER...NEW
DESIGN...EVANSVILLE...HARRISONVILLE...CHALFIN BRIDGE...MONROE
CITY...MADONNAVILLE...FOSTER POND...MAEYSTOWN...FULTS...WARTBURG...
KIDD...BURKSVILLE...RENAULT...PRAIRIE DU ROCHER AND AMES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3837 8991 3803 8993 3806 9051 3834 9051
TIME...MOT...LOC 0359Z 272DEG 21KT 3820 9040
HAIL...<.75IN
WIND...60 MPH
$$
TRUETT3 follow-up statements
997
WWUS53 KLSX 050420
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1120 PM CDT SAT AUG 4 2012
MOC099-050430-
/O.CAN.KLSX.SV.W.0232.000000T0000Z-120805T0445Z/
JEFFERSON MO-
1120 PM CDT SAT AUG 4 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JEFFERSON COUNTY
IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3803 8993 3805 9040 3810 9033 3809 9029
3812 9025 3816 9027 3819 9033 3821 9036
3826 9037 3835 9037 3837 8991
TIME...MOT...LOC 0420Z 272DEG 21KT 3819 9023
$$
ILC133-157-163-MOC186-050445-
/O.CON.KLSX.SV.W.0232.000000T0000Z-120805T0445Z/
MONROE IL-RANDOLPH IL-ST. CLAIR IL-STE. GENEVIEVE MO-
1120 PM CDT SAT AUG 4 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
STE. GENEVIEVE...SOUTH CENTRAL ST. CLAIR...NORTHWESTERN RANDOLPH AND
MONROE COUNTIES UNTIL 1145 PM CDT...
AT 1118 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 8 MILES EAST OF
CRYSTAL CITY...AND MOVING EAST AT 25 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...
WATERLOO...RED BUD...NEW DESIGN...EVANSVILLE...FULTS...WARTBURG...
KIDD...BURKSVILLE...RENAULT...PRAIRIE DU ROCHER...AMES...PADERBORN...
RUMA...PRAIRIE...MODOC AND HECKER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3803 8993 3805 9040 3810 9033 3809 9029
3812 9025 3816 9027 3819 9033 3821 9036
3826 9037 3835 9037 3837 8991
TIME...MOT...LOC 0420Z 272DEG 21KT 3819 9023
HAIL...<.75IN
WIND...60 MPH
$$
TRUETT487
WWUS53 KLSX 050435
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1135 PM CDT SAT AUG 4 2012
ILC133-163-MOC186-050444-
/O.CAN.KLSX.SV.W.0232.000000T0000Z-120805T0445Z/
MONROE IL-ST. CLAIR IL-STE. GENEVIEVE MO-
1135 PM CDT SAT AUG 4 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN STE. GENEVIEVE...
SOUTH CENTRAL ST. CLAIR AND MONROE COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
LAT...LON 3803 8993 3804 9013 3806 9013 3807 9014
3807 9017 3809 9020 3814 9003 3822 9004
3822 8992
TIME...MOT...LOC 0434Z 279DEG 43KT 3811 8995
$$
ILC157-050445-
/O.CON.KLSX.SV.W.0232.000000T0000Z-120805T0445Z/
RANDOLPH IL-
1135 PM CDT SAT AUG 4 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
RANDOLPH COUNTY UNTIL 1145 PM CDT...
AT 1131 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR EVANSVILLE...
AND MOVING EAST AT 30 MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED....WITH A WEAKENING TREND NOTED.
IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
BROKEN.
LOCATIONS IMPACTED INCLUDE...
EVANSVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3803 8993 3804 9013 3806 9013 3807 9014
3807 9017 3809 9020 3814 9003 3822 9004
3822 8992
TIME...MOT...LOC 0434Z 279DEG 28KT 3811 8995
HAIL...<.75IN
WIND...60 MPH
$$
TRUETT387
WWUS53 KLSX 050443
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1143 PM CDT SAT AUG 4 2012
ILC157-050452-
/O.EXP.KLSX.SV.W.0232.000000T0000Z-120805T0445Z/
RANDOLPH IL-
1143 PM CDT SAT AUG 4 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN RANDOLPH COUNTY
WILL EXPIRE AT 1145 PM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA. HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL
POSSIBLE WITH THIS THUNDERSTORM AS IT MOVES EAST SOUTHEAST THROUGH
CENTRAL AND EASTERN RANDOLPH COUNTY THROUGH 1215 AM.
LAT...LON 3803 8993 3804 9013 3806 9013 3807 9014
3807 9017 3809 9020 3814 9003 3822 9004
3822 8992
TIME...MOT...LOC 0442Z 279DEG 28KT 3810 8987
$$
TRUETTThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 8:30 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Gasconade, Montgomery, Osage | 45 min |
| Aug 4, 8:47 PM CDT | Severe Thunderstorm Warning | LSX | Gasconade, Osage | 43 min |
| Aug 4, 9:07 PM CDT | Severe Thunderstorm Warning | LSX | Gasconade, Montgomery, Osage, Warren | 23 min |
| Aug 4, 9:20 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade, Warren, Washington | 40 min |
| Aug 4, 9:38 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Charles, Saint Louis, Warren, Washington | 67 min |
| Aug 4, 10:22 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Saint Charles, Saint Louis, City of Saint Louis | 38 min |
| Aug 4, 11:46 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 33 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.