Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 20, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Feb 29, 2012, 2:31 AM CST for Monroe County, Randolph County, Illinois; Jefferson County, Sainte Genevieve County, Missouri. It was in force for 31 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
- Feb 29, 2012, 2:31 AM CST (08:31 UTC)
- Expired
- Feb 29, 2012, 3:02 AM CST
- In force
- 31 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, Jefferson County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 79 km from the middle of the area, began a volume at 08:32 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 |
|---|---|---|---|
| Feb 29, 1:14 AM CST | Tornado Watch | SPC | 11 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 8.5 hours before the alert went out and 265 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
- 1465 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 390 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
783
WUUS53 KLSX 290831
SVRLSX
ILC133-157-MOC099-186-290915-
/O.NEW.KLSX.SV.W.0020.120229T0831Z-120229T0915Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
231 AM CST WED FEB 29 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
WESTERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
SOUTHEASTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
NORTHERN STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
* UNTIL 315 AM CST
* AT 227 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM CRYSTAL CITY TO PARK HILLS...AND MOVING EAST AT 55 MPH.
* LOCATIONS IMPACTED INCLUDE...
RED BUD...STE. GENEVIEVE...ROCKY RIDGE...BLOOMSDALE...WEINGARTEN...
NEW DESIGN...EVANSVILLE...ST. MARY...CHALFIN BRIDGE...MONROE
CITY...MADONNAVILLE...MAEYSTOWN...FULTS...BURKSVILLE...KIDD...
RENAULT...PRAIRIE DU ROCHER...AMES...KELLOGG AND MODOC.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.
&&
LAT...LON 3788 9046 3798 9032 3804 9042 3823 9044
3831 9003 3831 8991 3828 8992 3826 8992
3787 8993
TIME...MOT...LOC 0832Z 262DEG 47KT 3824 9031 3786 9041
WIND...HAIL 60MPH <.75IN
$$
TILLY2 follow-up statements
016
WWUS53 KLSX 290845
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
245 AM CST WED FEB 29 2012
MOC099-290855-
/O.CAN.KLSX.SV.W.0020.000000T0000Z-120229T0915Z/
JEFFERSON MO-
245 AM CST WED FEB 29 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JEFFERSON COUNTY
IS CANCELLED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
WARNED AREA.
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.
LAT...LON 3788 9046 3798 9032 3811 9024 3825 9030
3831 9003 3831 8991 3828 8992 3787 8993
TIME...MOT...LOC 0845Z 263DEG 59KT 3822 9001 3796 9008
$$
ILC133-157-MOC186-290915-
/O.CON.KLSX.SV.W.0020.000000T0000Z-120229T0915Z/
MONROE IL-RANDOLPH IL-STE. GENEVIEVE MO-
245 AM CST WED FEB 29 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN STE.
GENEVIEVE...WESTERN RANDOLPH AND SOUTHERN MONROE COUNTIES UNTIL 315
AM CST...
AT 241 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM NEW DESIGN TO ROCKY RIDGE...MOVING EAST AT 60 MPH.
LOCATIONS IMPACTED INCLUDE...
STE. GENEVIEVE...ST. MARY...EVANSVILLE...RUMA...HECKER...PRAIRIE
AND ROOTS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.
&&
LAT...LON 3788 9046 3798 9032 3811 9024 3825 9030
3831 9003 3831 8991 3828 8992 3787 8993
TIME...MOT...LOC 0845Z 263DEG 52KT 3822 9001 3796 9008
WIND...HAIL 60MPH <.75IN
$$
TILLY984
WWUS53 KLSX 290902
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
302 AM CST WED FEB 29 2012
ILC133-157-MOC186-290912-
/O.CAN.KLSX.SV.W.0020.000000T0000Z-120229T0915Z/
MONROE IL-RANDOLPH IL-STE. GENEVIEVE MO-
302 AM CST WED FEB 29 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN STE. GENEVIEVE...
WESTERN RANDOLPH AND SOUTHERN MONROE COUNTIES IS CANCELLED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY. HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THESE
THUNDERSTORMS.
IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL 900 AM CST.
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.
LAT...LON 3788 9046 3798 9032 3811 9024 3825 9030
3831 9003 3831 8991 3828 8992 3787 8993
TIME...MOT...LOC 0902Z 262DEG 52KT 3825 8970 3799 8977
$$
TILLYThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 29, 1:21 AM CST | Tornado Warning | LSX | Crawford | 39 min |
| Feb 29, 1:52 AM CST | Severe Thunderstorm Warning | LSX | Jefferson, Saint Francois, Washington | 53 min |
| Feb 29, 2:13 AM CST | Tornado Warning | LSX | Jefferson, Saint Francois, Washington | 20 min |
| Feb 29, 2:22 AM CST | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 38 min |
| Feb 29, 2:50 AM CST | Severe Thunderstorm Warning | LSX | Madison | 40 min |
| Feb 29, 3:05 AM CST | Tornado Warning | LSX | Madison | 25 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.