Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 304, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Sep 7, 2012, 7:35 PM CDT for Randolph County, Saint Clair County, Washington County, Illinois; Sainte Genevieve County, Saint Francois County, Missouri. It was in force for 20 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
- Sep 7, 2012, 7:35 PM CDT (00:35 UTC)
- Expired
- Sep 7, 2012, 7:55 PM CDT
- In force
- 20 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Randolph County, IL, Saint Clair County, IL, Washington County, IL, Saint Francois County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 111 km from the middle of the area, began a volume at 00:38 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 7, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.6 hours before the alert went out and 262 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 723 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- -113 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
797
WUUS53 KLSX 080035
SVRLSX
ILC157-163-189-MOC186-187-080115-
/O.NEW.KLSX.SV.W.0304.120908T0035Z-120908T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
735 PM CDT FRI SEP 7 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
SOUTHEASTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
SOUTHWESTERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...
SOUTHEASTERN STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
SOUTHERN ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI...
* UNTIL 815 PM CDT
* AT 734 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM NEW DESIGN TO RED BUD TO STE. GENEVIEVE TO KNOB
LICK...AND MOVING EAST AT 35 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...
CHESTER...SPARTA...BALDWIN...WOMAC...ST. MARY...BREMEN...MARISSA...
TILDEN...STEELEVILLE...PERCY...COULTERVILLE...ELLIS GROVE...
PRESTON...WALSH...KASKASKIA...NEW PALESTINE...MINNITH...HOUSTON...
LENZBURG AND BLAIR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3821 8959 3795 8959 3780 8968 3784 8974
3785 8979 3788 8981 3790 8985 3787 8990
3787 8994 3782 8999 3764 9014 3764 9028
3794 8997 3818 8988 3828 8993 3830 8990
3829 8935 3821 8934
TIME...MOT...LOC 0035Z 270DEG 31KT 3831 9009 3815 8997
3796 9002 3771 9037
HAIL...<.75IN
WIND...60 MPH
$$
TRUETT1 follow-up statement
185
WWUS53 KLSX 080055
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
755 PM CDT FRI SEP 7 2012
ILC157-163-189-MOC186-187-080103-
/O.CAN.KLSX.SV.W.0304.000000T0000Z-120908T0115Z/
RANDOLPH IL-ST. CLAIR IL-WASHINGTON IL-STE. GENEVIEVE MO-
ST. FRANCOIS MO-
755 PM CDT FRI SEP 7 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ST. FRANCOIS...
SOUTHEASTERN STE. GENEVIEVE...SOUTHWESTERN WASHINGTON...SOUTHEASTERN
ST. CLAIR AND RANDOLPH COUNTIES IS CANCELLED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY. HOWEVER MODERATE AND HEAVY RAIN IS STILL POSSIBLE WITH
THESE THUNDERSTORMS ACROSS RANDOLPH...SOUTHWEST WARNINGTON...AND
SOUTHEAST ST CLAIR COUNTIES THROUGH 830 PM.
LAT...LON 3821 8959 3795 8959 3780 8968 3784 8974
3785 8979 3788 8981 3790 8985 3787 8990
3787 8994 3782 8999 3764 9014 3764 9028
3794 8997 3818 8988 3828 8993 3830 8990
3829 8935 3821 8934
TIME...MOT...LOC 0053Z 270DEG 31KT 3831 8989 3815 8977
3796 8982 3771 9017
$$
TRUETTThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 7:03 PM CDT | Flash Flood Warning | LSX | Bond | 3 hr |
| Sep 7, 7:03 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair | 42 min |
| Sep 7, 7:06 PM CDT | Tornado Warning | LSX | Washington | 24 min |
| Sep 7, 7:25 PM CDT | Areal Flood Advisory | LSX | Madison, Saint Clair | 6 hr |
| Sep 7, 7:11 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Reynolds | 49 min |
| Sep 7, 8:09 PM CDT | Areal Flood Advisory | LSX | Saint Francois, Washington | 6 hr |
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.