Alert archive / Illinois / Tornado Warnings in 2012
Tornado Warning 15, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 28, 2012, 3:59 PM CDT for Saint Clair County, Illinois. It was in force for 31 min. 30 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 28, 2012, 3:59 PM CDT (20:59 UTC)
- Expired
- Apr 28, 2012, 4:30 PM CDT
- In force
- 31 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 2.5 in
County Saint Clair County, IL
The radar
The St Louis radar (KLSX), 67 km from the middle of the area, began a volume at 21:01 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 |
|---|---|---|---|
| Apr 28, 3:59 PM CDT | HAIL 1.75 | Fairmont City, IL | AT CAHOKIA MOUNDS |
| Apr 28, 4:03 PM CDT | HAIL 1.75 | Fairview Heights, IL | |
| Apr 28, 4:03 PM CDT | HAIL 2 | Fairview Heights, IL | LEAVES SHREDDED FROM TREES. DAMAGED ROOF SHINGLES. DENTS ON CARS. |
| Apr 28, 4:05 PM CDT | FUNNEL CLOUD | O'Fallon, IL | ON NORTH SIDE OF OFALLON LOOKING WEST |
| Apr 28, 4:05 PM CDT | HAIL 2.2 | Fairview Heights, IL | |
| Apr 28, 4:05 PM CDT | HAIL 2.5 | Fairview Heights, IL | NEAR US HWY AND BUNKUM RD |
| Apr 28, 4:10 PM CDT | FUNNEL CLOUD | Belleville, IL | OBSERVED NEAR BELLEVILLE EAST HIGH SCHOOL REACH HALF WAY TO THE GROUND |
| Apr 28, 4:10 PM CDT | HAIL 1.75 | O'Fallon, IL | |
| Apr 28, 4:10 PM CDT | HAIL 2 | O'Fallon, IL | EST 60 TO 70 MPH WINDS...NEAR GREEN MOUNT RD AND I 64 |
| Apr 28, 4:12 PM CDT | HAIL 2.5 | O'Fallon, IL | |
| Apr 28, 4:14 PM CDT | HAIL 2 | Fairview Heights, IL | |
| Apr 28, 4:15 PM CDT | HAIL 1.75 | Lebanon, IL | WIND EST 50 MPH...SMALL TREE BRANCHES DOWN |
| Apr 28, 4:15 PM CDT | HAIL 2.75 | O'Fallon, IL | COVERING THE GROUND 3 INCHES DEEP |
| Apr 28, 4:15 PM CDT | HAIL 3.5 | O'Fallon, IL | RELAYED FROM A NWS EMPLOYEE. RELATIVE OF EMPLOYEE REPORTED 3.5 BY 2 INCH HAIL. DISC SHAPED. LASTED FOR ABOUT 10 MINUTES. |
| Apr 28, 4:19 PM CDT | HAIL 1.75 | Scott Afb, IL | |
| Apr 28, 4:19 PM CDT | HAIL 2.5 | O'Fallon, IL | |
| Apr 28, 4:20 PM CDT | TSTM WND DMG | Shiloh, IL | 8 TO 10 INCH LIMBS DOWN |
| Apr 28, 4:20 PM CDT | HAIL 2.5 | 2 S Lebanon, IL | |
| Apr 28, 4:22 PM CDT | HAIL 2.75 | Lebanon, IL | HAIL DAMAGED NUMEROUS CAR WINDSHIELDS AND HOME WINDOWS AS WELL. |
| Apr 28, 4:23 PM CDT | HAIL 0.5 | Belleville, IL | |
| Apr 28, 4:25 PM CDT | HAIL 1.75 | Belleville, IL | |
| Apr 28, 4:26 PM CDT | HAIL 1.75 | Belleville, IL | |
| Apr 28, 4:27 PM CDT | HAIL 2.75 | Belleville, IL | AT SCOTT AFB |
| Apr 28, 4:28 PM CDT | HAIL 1 | Belleville, IL | EAST PART OF BELLEVILLE |
| Apr 28, 4:29 PM CDT | HAIL 1 | Swansea, IL | |
| Apr 28, 4:30 PM CDT | TSTM WND DMG | O'Fallon, IL | SEVERAL LARGE METAL ROAD SIGNS BLOWN DOWN BETWEEN OFALLON AND THE COUNTY LINE ALONG I 64...ALSO A FEW LARGE TREES WERE SNAPPED ACROSS THE SOUTHEAST PORTION OF OFALLON JUST NORTH OF I 64 |
| Apr 28, 4:30 PM CDT | HAIL 1.75 | 1 W Shiloh, IL | COVERING THE GROUND |
| Apr 28, 4:30 PM CDT | HAIL 2 | 2 Wnw Belleville, IL | JUST ENDED |
| Apr 28, 4:30 PM CDT | HAIL 3 | Belleville, IL | DAMAGE TO MOTOR VEHICLES. |
| Apr 28, 4:38 PM CDT | HAIL 0.7 | Shiloh, 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 28, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.0 hours before the alert went out and 207 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
- 1019 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 681 m²/s²
- 0-3 km storm-relative helicity
- 811 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
076
WFUS53 KLSX 282059
TORLSX
ILC163-282130-
/O.NEW.KLSX.TO.W.0015.120428T2059Z-120428T2130Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
359 PM CDT SAT APR 28 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* TORNADO WARNING FOR...
NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
* UNTIL 430 PM CDT
* AT 357 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR CASEYVILLE...AND MOVING EAST AT 30 MPH.
HAZARD...DEVELOPING TORNADO AND TENNIS BALL SIZE HAIL.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...SIGNIFICANT HOUSE AND BUILDING DAMAGE POSSIBLE. MOBILE
HOMES COMPLETELY DESTROYED IF HIT. SOME TREES UPROOTED OR
SNAPPED. VEHICLES WILL LIKELY BE THROWN BY TORNADIC WINDS.
* LOCATIONS IMPACTED INCLUDE...
FAIRVIEW HEIGHTS...BELLEVILLE...SWANSEA...O'FALLON...SHILOH...SCOTT
AFB AND LEBANON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 3865 8973 3845 8989 3855 9016 3866 9010
TIME...MOT...LOC 2059Z 290DEG 27KT 3861 9004
TORNADO...RADAR INDICATED
HAIL...2.50IN
$$
BYRD1 follow-up statement
555 WWUS53 KLSX 282130 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 430 PM CDT SAT APR 28 2012 ILC163-282140- /O.EXP.KLSX.TO.W.0015.000000T0000Z-120428T2130Z/ ST. CLAIR IL- 430 PM CDT SAT APR 28 2012 ...THE TORNADO WARNING FOR NORTHERN ST. CLAIR COUNTY HAS EXPIRED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA AND WAS NO LONGER SHOWING STRONG ROTATION WITH IT...BUT IT REMAINS SEVERE...PRODUCING LARGE HAIL AND DAMAGING WINDS AS IT MOVES TO THE EAST. ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 7 PM. LAT...LON 3865 8973 3845 8989 3855 9016 3866 9010 TIME...MOT...LOC 2130Z 290DEG 27KT 3853 8976 $$ BYRD
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 2:26 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 49 min |
| Apr 28, 3:05 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey, Madison | 40 min |
| Apr 28, 3:45 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Madison, Saint Clair | 45 min |
| Apr 28, 4:22 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 38 min |
| Apr 28, 4:28 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 47 min |
| Apr 28, 4:56 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 49 min |
| Apr 28, 5:13 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Marion, Washington | 47 min |
| Apr 28, 5:38 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 37 min |
| Apr 28, 5:50 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 40 min |
| Apr 28, 6:01 PM CDT | Tornado Warning | LSX | Madison, Saint Clair | 29 min |
| Apr 28, 6:10 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 34 min |
| Apr 28, 6:17 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Washington | 33 min |
| Apr 28, 6:27 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 48 min |
| Apr 28, 6:35 PM CDT | Severe Thunderstorm Warning | LSX | Fayette, Marion | 25 min |
| Apr 28, 6:53 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 52 min |
| Apr 28, 6:58 PM CDT | Severe Thunderstorm Warning | LSX | Fayette, Marion | 32 min |
Nearby
Tornado Warnings in Illinois, 2012Every tornado warning in 2012Tornadoes 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.