Alert archive / Illinois / Tornado Warnings in 2011
Tornado Warning 54, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 22, 2011, 9:24 PM CDT for Clinton County, Washington County, Illinois. It was in force for 36 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
- Apr 22, 2011, 9:24 PM CDT (02:24 UTC)
- Expired
- Apr 22, 2011, 10:00 PM CDT
- In force
- 36 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
Counties Clinton County, IL, Washington County, IL
The radar
The St Louis radar (KLSX), 120 km from the middle of the area, began a volume at 02:24 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 |
|---|---|---|---|
| Apr 22, 5:49 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 2.4 hours before the alert went out and 210 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.
485 WFUS53 KLSX 230224 TORLSX ILC027-189-230315- /O.NEW.KLSX.TO.W.0054.110423T0224Z-110423T0315Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 924 PM CDT FRI APR 22 2011 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * TORNADO WARNING FOR... SOUTHERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS... WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS... * UNTIL 1015 PM CDT * AT 920 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 5 MILES NORTHEAST OF NEW ATHENS...OR 6 MILES SOUTHEAST OF FREEBURG...AND MOVING EAST AT 40 MPH. * LOCATIONS IMPACTED INCLUDE... NASHVILLE...NEW MEMPHIS...LIVELY GROVE...OKAWVILLE...ASHLEY... IRVINGTON...JOHANNISBURG...VENEDY...STONE CHURCH...DAMIANSVILLE... ELKTON...OAKDALE...FROGTOWN...ADDIEVILLE...CORDES...COVINGTON...NEW MINDEN...POSEN...POSEY AND HUEGELY. 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 3824 8915 3826 8971 3850 8971 3857 8915 TIME...MOT...LOC 0223Z 266DEG 34KT 3838 8978 $$ BRITT
3 follow-up statements
043 WWUS53 KLSX 230243 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 943 PM CDT FRI APR 22 2011 ILC027-189-230315- /O.CON.KLSX.TO.W.0054.000000T0000Z-110423T0315Z/ WASHINGTON IL-CLINTON IL- 943 PM CDT FRI APR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN CLINTON AND WASHINGTON COUNTIES UNTIL 1015 PM CDT... AT 941 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR OKAWVILLE...OR 6 MILES NORTHWEST OF NASHVILLE...MOVING EAST AT 45 MPH. LOCATIONS IMPACTED INCLUDE... NASHVILLE...ASHLEY...IRVINGTON...COVINGTON...POSEN...NEW MINDEN... HUEGELY...POSEY...BEAUCOUP...HOYLETON...RADOM...HOFFMAN AND RICHVIEW. PRECAUTIONARY/PREPAREDNESS ACTIONS... HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS. && LAT...LON 3826 8957 3852 8957 3857 8915 3824 8915 TIME...MOT...LOC 0243Z 256DEG 39KT 3841 8945 $$ BRITT
185 WWUS53 KLSX 230251 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 951 PM CDT FRI APR 22 2011 ILC027-189-230315- /O.CON.KLSX.TO.W.0054.000000T0000Z-110423T0315Z/ WASHINGTON IL-CLINTON IL- 951 PM CDT FRI APR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN CLINTON AND WASHINGTON COUNTIES UNTIL 1015 PM CDT... AT 949 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 6 MILES NORTH OF NASHVILLE...MOVING EAST AT 50 MPH. LOCATIONS IMPACTED INCLUDE... ASHLEY...IRVINGTON...POSEN...POSEY...HUEGELY...BEAUCOUP... HOYLETON...HOFFMAN...RADOM AND RICHVIEW. 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. 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 3826 8957 3852 8957 3857 8915 3824 8915 TIME...MOT...LOC 0251Z 264DEG 44KT 3843 8938 $$ BRITT
460 WWUS53 KLSX 230300 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1000 PM CDT FRI APR 22 2011 ILC027-189-230310- /O.CAN.KLSX.TO.W.0054.000000T0000Z-110423T0315Z/ WASHINGTON IL-CLINTON IL- 1000 PM CDT FRI APR 22 2011 ...THE TORNADO WARNING FOR SOUTHEASTERN CLINTON AND WASHINGTON COUNTIES IS CANCELLED... THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS BEEN CANCELLED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE AREA. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS. LAT...LON 3826 8957 3852 8957 3857 8915 3824 8915 TIME...MOT...LOC 0300Z 264DEG 44KT 3844 8924 $$ 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, 8:48 PM CDT | Tornado Warning | LSX | Monroe, Saint Clair | 57 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, 9:30 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.