Alert archive / Illinois / Tornado Warnings in 2011
Tornado Warning 52, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 22, 2011, 8:48 PM CDT for Monroe County, Saint Clair County, Illinois. It was in force for 57 min. 4 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 22, 2011, 8:48 PM CDT (01:48 UTC)
- Expired
- Apr 22, 2011, 9:45 PM CDT
- In force
- 57 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
Counties Monroe County, IL, Saint Clair County, IL
The radar
The St Louis radar (KLSX), 74 km from the middle of the area, began a volume at 01:50 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 |
|---|---|---|---|
| Apr 22, 8:49 PM CDT | HAIL 0.5 | Waterloo, IL | |
| Apr 22, 8:50 PM CDT | TSTM WND DMG | 1 N Waterloo, IL | TREES DOWN |
| Apr 22, 9:00 PM CDT | TSTM WND DMG | Waterloo, IL | 2 AND 4 INCH LIMBS BLOWN DOWN |
| Apr 22, 9:09 PM CDT | HAIL 0.88 | Smithton, IL |
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 |
|---|---|---|---|
| Apr 22, 3:34 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.8 hours before the alert went out and 235 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
- 342 J/kg
- Mixed-layer CIN
- -152 J/kg
- Mixed-layer LCL
- 492 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 351 m²/s²
- 0-3 km storm-relative helicity
- 346 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
353
WFUS53 KLSX 230148
TORLSX
ILC133-163-230245-
/O.NEW.KLSX.TO.W.0052.110423T0148Z-110423T0245Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
848 PM CDT FRI APR 22 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* TORNADO WARNING FOR...
NORTHERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
SOUTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
* UNTIL 945 PM CDT
* AT 846 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR WATERLOO...AND MOVING EAST AT 35 MPH.
* LOCATIONS IMPACTED INCLUDE...
WATERLOO...MILLSTADT...FREEBURG...NEW DESIGN...SMITHTON...NEW
ATHENS...MARISSA...BURKSVILLE...BARR...FLORAVILLE...PADERBORN...
HECKER...LENZBURG...FAYETTEVILLE AND ST. LIBORY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.
TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.
&&
LAT...LON 3823 8993 3829 9035 3847 9027 3850 8971
3822 8971
TIME...MOT...LOC 0148Z 273DEG 32KT 3835 9018
$$
BRITT5 follow-up statements
743
WWUS53 KLSX 230154
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
854 PM CDT FRI APR 22 2011
ILC133-163-230245-
/O.CON.KLSX.TO.W.0052.000000T0000Z-110423T0245Z/
MONROE IL-ST. CLAIR IL-
854 PM CDT FRI APR 22 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN ST. CLAIR AND
NORTHERN MONROE COUNTIES UNTIL 945 PM CDT...
AT 850 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM WITH VERY STRONG ROTATION THAT IS LIKELY
PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR
WATERLOO...MOVING EAST AT 30 MPH.
LOCATIONS IMPACTED INCLUDE...
MILLSTADT...FREEBURG...NEW DESIGN...SMITHTON...NEW ATHENS...
MARISSA...BARR...FLORAVILLE...PADERBORN...HECKER...LENZBURG...
FAYETTEVILLE AND ST. LIBORY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.
TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.
&&
LAT...LON 3823 8993 3829 9035 3847 9027 3850 8971
3822 8971
TIME...MOT...LOC 0153Z 273DEG 28KT 3836 9013
$$
BRITT610
WWUS53 KLSX 230207
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
907 PM CDT FRI APR 22 2011
ILC133-163-230245-
/O.CON.KLSX.TO.W.0052.000000T0000Z-110423T0245Z/
MONROE IL-ST. CLAIR IL-
907 PM CDT FRI APR 22 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN ST. CLAIR AND
EAST CENTRAL MONROE COUNTIES UNTIL 945 PM CDT...
AT 903 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM WITH VERY STRONG ROTATION THAT IS LIKELY
PRODUCING A TORNADO. TREES HAVE BEEN SNAPPED AND BLOWN DOWN 1 MILE
NORTH OF WATERLOO WITH THIS STORM. THIS DANGEROUS STORM WAS LOCATED
NEAR SMITHTON...OR 7 MILES EAST OF WATERLOO...MOVING EAST AT 35 MPH.
LOCATIONS IMPACTED INCLUDE...
FREEBURG...SMITHTON...NEW ATHENS...MARISSA...LENZBURG...
FAYETTEVILLE AND ST. LIBORY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.
TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.
&&
LAT...LON 3823 8993 3827 9024 3848 9007 3850 8971
3822 8972
TIME...MOT...LOC 0206Z 269DEG 28KT 3837 9000
$$
BRITT167
WWUS53 KLSX 230216
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
916 PM CDT FRI APR 22 2011
ILC133-163-230245-
/O.CON.KLSX.TO.W.0052.000000T0000Z-110423T0245Z/
MONROE IL-ST. CLAIR IL-
916 PM CDT FRI APR 22 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN ST. CLAIR AND
CENTRAL MONROE COUNTIES UNTIL 945 PM CDT...
AT 911 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR NEW ATHENS...OR NEAR FREEBURG...MOVING EAST AT
35 MPH. THIS IS AN EXTREMELY DANGEROUS SITUATION...DAMAGE HAS BEEN
REPORTED WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
MARISSA...LENZBURG AND FAYETTEVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.
TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.
&&
LAT...LON 3823 8993 3827 9024 3848 9007 3850 8971
3822 8972
TIME...MOT...LOC 0215Z 271DEG 31KT 3836 8988
$$
BRITT533 WWUS53 KLSX 230232 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 932 PM CDT FRI APR 22 2011 ILC133-230241- /O.CAN.KLSX.TO.W.0052.000000T0000Z-110423T0245Z/ MONROE IL- 932 PM CDT FRI APR 22 2011 ...THE TORNADO WARNING FOR CENTRAL MONROE COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. STRONG THUNDERSTORMS ARE STILL MOVING THROUGH THE AREA...AND A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM CDT. LAT...LON 3830 8985 3848 8982 3850 8971 3827 8972 TIME...MOT...LOC 0231Z 267DEG 26KT 3839 8972 $$ ILC163-230245- /O.CON.KLSX.TO.W.0052.000000T0000Z-110423T0245Z/ ST. CLAIR IL- 932 PM CDT FRI APR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL ST. CLAIR COUNTY UNTIL 945 PM CDT... AT 928 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 7 MILES SOUTHWEST OF NEW MEMPHIS...OR 8 MILES SOUTH OF MASCOUTAH...MOVING EAST AT 30 MPH. LOCATIONS IMPACTED INCLUDE... MAINLY RURAL AREAS OF EXTREME EASTERN ST. CLAIR COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW. && LAT...LON 3830 8985 3848 8982 3850 8971 3827 8972 TIME...MOT...LOC 0231Z 267DEG 26KT 3839 8972 $$ BRITT
338 WWUS53 KLSX 230237 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 937 PM CDT FRI APR 22 2011 ILC163-230247- /O.EXP.KLSX.TO.W.0052.000000T0000Z-110423T0245Z/ ST. CLAIR IL- 937 PM CDT FRI APR 22 2011 ...THE TORNADO WARNING FOR EAST CENTRAL ST. CLAIR COUNTY WILL EXPIRE AT 945 PM CDT... THE STORM WHICH PROMPTED THE WARNING HAS 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 3830 8985 3848 8982 3850 8971 3827 8972 TIME...MOT...LOC 0237Z 267DEG 26KT 3839 8966 $$ BRITT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 7:59 PM CDT | Tornado Warning | LSX | Madison, Saint Clair | 46 min |
| Apr 22, 8:21 PM CDT | Tornado Warning | LSX | Monroe, Saint Clair | 39 min |
| Apr 22, 8:33 PM CDT | Tornado Warning | LSX | Madison, Saint Clair | 42 min |
| Apr 22, 8:55 PM CDT | Tornado Warning | LSX | Bond, Clinton, Fayette, Madison, Saint Clair | 50 min |
| Apr 22, 9:01 PM CDT | Severe Thunderstorm Warning | LSX | Fayette, Marion | 20 min |
| Apr 22, 9:24 PM CDT | Tornado Warning | LSX | Clinton, Washington | 36 min |
| Apr 22, 9:30 PM CDT | Flash Flood Warning | LSX | Monroe, Saint Clair | 5 hr |
| Apr 22, 9:41 PM CDT | Tornado Warning | LSX | Bond, Fayette, Marion | 22 min |
| Apr 22, 9:51 PM CDT | Flash Flood Warning | LSX | Clinton, Washington | 5 hr |
| Apr 22, 9:59 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Marion, Washington | 11 min |
| Apr 22, 10:31 PM CDT | Tornado Warning | LSX | Monroe, Randolph, Saint Clair | 44 min |
| Apr 22, 10:55 PM CDT | Flash Flood Warning | LSX | Monroe, Randolph | 6 hr |
| Apr 22, 11:38 PM CDT | River Flood Warning | LSX | Brown | 25 days |
| Apr 22, 11:38 PM CDT | River Flood Warning | LSX | Morgan, Pike | 25 days |
| Apr 22, 11:38 PM CDT | River Flood Warning | LSX | Pike, Scott | 31 days |
| Apr 22, 11:53 PM CDT | River Flood Warning | LSX | Saint Clair | 14 days |
| Apr 23, 4:23 AM CDT | Flash Flood Warning | LSX | Monroe, Randolph | 8 hr |
| Apr 23, 12:29 PM CDT | Flash Flood Warning | LSX | Monroe, Randolph | 6 hr |
| Apr 23, 6:22 PM CDT | Flash Flood Warning | LSX | Monroe, Randolph | 6 hr |
Nearby
Tornado Warnings in Illinois, 2011Every tornado warning in 2011Tornadoes in 2011
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.