Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 130, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 9:31 PM CDT for Randolph County, Saint Clair County, Washington County, Illinois. It was in force for 33 min. 2 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, 9:31 PM CDT (02:31 UTC)
- Expired
- Apr 28, 2012, 10:04 PM CDT
- In force
- 33 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Randolph County, IL, Saint Clair County, IL, Washington County, IL
The radar
The St Louis radar (KLSX), 97 km from the middle of the area, began a volume at 02:31 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, 9:35 PM CDT | HAIL 2 | 1 Ssw Marissa, IL | |
| Apr 28, 9:39 PM CDT | HAIL 1 | Marissa, IL | HAIL COVERING GROUND. |
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, 5:15 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 2.5 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 545 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
958
WUUS53 KLSX 290231
SVRLSX
ILC157-163-189-290315-
/O.NEW.KLSX.SV.W.0130.120429T0231Z-120429T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
931 PM CDT SAT APR 28 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
SOUTHEASTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
SOUTHWESTERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...
* UNTIL 1015 PM CDT
* AT 927 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BALDWIN...
AND MOVING EAST AT 35 MPH.
HAZARD...QUARTER SIZE HAIL.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.
* LOCATIONS IMPACTED INCLUDE...
SPARTA...BALDWIN...MARISSA...TILDEN...COULTERVILLE...HOUSTON AND
EDEN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3821 8935 3822 8959 3805 8959 3818 8997
3822 8995 3822 8990 3827 8992 3828 8992
3828 8990 3831 8992 3836 8990 3822 8934
TIME...MOT...LOC 0231Z 290DEG 28KT 3823 8984
HAIL...1.00IN
WIND...<50 MPH
$$
KANOFSKY4 follow-up statements
392
WWUS53 KLSX 290237
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
937 PM CDT SAT APR 28 2012
ILC157-163-189-290315-
/O.CON.KLSX.SV.W.0130.000000T0000Z-120429T0315Z/
RANDOLPH IL-ST. CLAIR IL-WASHINGTON IL-
937 PM CDT SAT APR 28 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
WASHINGTON...SOUTHEASTERN ST. CLAIR AND NORTHEASTERN RANDOLPH
COUNTIES UNTIL 1015 PM CDT...
AT 931 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BALDWIN...AND
MOVING EAST AT 30 MPH.
HAZARD...GOLF BALL SIZE HAIL.
SOURCE...TRAINED WEATHER SPOTTERS.
IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS.
IN ADDITION...TWO INCH DIAMETER HAIL WAS REPORTED SOUTHWEST OF
MARISSA WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
SPARTA...MARISSA...TILDEN...COULTERVILLE...HOUSTON AND EDEN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3821 8935 3822 8959 3805 8959 3818 8997
3822 8995 3822 8990 3827 8992 3828 8992
3828 8990 3831 8992 3836 8990 3822 8934
TIME...MOT...LOC 0236Z 290DEG 28KT 3821 8979
HAIL...1.75IN
WIND...<50 MPH
$$
KANOFSKY367
WWUS53 KLSX 290239
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
939 PM CDT SAT APR 28 2012
ILC157-163-189-290315-
/O.CON.KLSX.SV.W.0130.000000T0000Z-120429T0315Z/
RANDOLPH IL-ST. CLAIR IL-WASHINGTON IL-
939 PM CDT SAT APR 28 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
WASHINGTON...SOUTHEASTERN ST. CLAIR AND NORTHEASTERN RANDOLPH
COUNTIES UNTIL 1015 PM CDT...
AT 936 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BALDWIN...AND
MOVING EAST AT 30 MPH.
HAZARD...GOLF BALL SIZE HAIL.
SOURCE...TRAINED WEATHER SPOTTERS.
IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS.
LOCATIONS IMPACTED INCLUDE...
SPARTA...TILDEN...COULTERVILLE AND EDEN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3821 8935 3822 8959 3805 8959 3815 8989
3834 8980 3822 8934
TIME...MOT...LOC 0240Z 290DEG 28KT 3820 8975
HAIL...1.75IN
WIND...<50 MPH
$$
KANOFSKY013
WWUS53 KLSX 290253
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
953 PM CDT SAT APR 28 2012
ILC163-290303-
/O.CAN.KLSX.SV.W.0130.000000T0000Z-120429T0315Z/
ST. CLAIR IL-
953 PM CDT SAT APR 28 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. CLAIR COUNTY
IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3821 8935 3822 8959 3816 8959 3820 8971
3830 8966 3822 8934
TIME...MOT...LOC 0253Z 290DEG 28KT 3816 8963
$$
ILC157-189-290315-
/O.CON.KLSX.SV.W.0130.000000T0000Z-120429T0315Z/
RANDOLPH IL-WASHINGTON IL-
953 PM CDT SAT APR 28 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
WASHINGTON AND NORTHEASTERN RANDOLPH COUNTIES UNTIL 1015 PM CDT...
AT 950 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR TILDEN...AND
MOVING EAST AT 30 MPH.
HAZARD...QUARTER SIZE HAIL.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.
LOCATIONS IMPACTED INCLUDE...
COULTERVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3821 8935 3822 8959 3816 8959 3820 8971
3830 8966 3822 8934
TIME...MOT...LOC 0253Z 290DEG 28KT 3816 8963
HAIL...1.00IN
WIND...<50 MPH
$$
KANOFSKY571
WWUS53 KLSX 290304
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1004 PM CDT SAT APR 28 2012
ILC157-189-290314-
/O.CAN.KLSX.SV.W.0130.000000T0000Z-120429T0315Z/
RANDOLPH IL-WASHINGTON IL-
1004 PM CDT SAT APR 28 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WASHINGTON AND
NORTHEASTERN RANDOLPH COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
LAT...LON 3821 8935 3822 8959 3816 8959 3820 8971
3830 8966 3822 8934
TIME...MOT...LOC 0304Z 290DEG 28KT 3813 8953
$$
KANOFSKYThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 7:41 PM CDT | Areal Flood Advisory | LSX | Clinton, Saint Clair, Washington | 6 hr |
| Apr 28, 8:12 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 48 min |
| Apr 28, 8:39 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 36 min |
| Apr 28, 9:05 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair | 33 min |
| Apr 28, 10:01 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Macoupin, Madison, Montgomery | 34 min |
| Apr 28, 10:25 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin, Montgomery | 28 min |
| Apr 29, 1:44 AM CDT | Severe Thunderstorm Warning | LSX | Madison | 46 min |
| Apr 29, 4:59 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 46 min |
| Apr 29, 5:32 AM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey | 36 min |
| Apr 29, 7:54 AM CDT | Flash Flood Warning | LSX | Macoupin, Montgomery | 6 hr |
| Apr 29, 7:58 AM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 20 min |
| Apr 29, 4:00 PM CDT | Flash Flood Watch | LSX | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 15 hr |
Nearby
Severe Thunderstorm Warnings in Illinois, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.