Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 129, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 9:05 PM CDT for Monroe County, Randolph County, Saint Clair 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, 9:05 PM CDT (02:05 UTC)
- Expired
- Apr 28, 2012, 9:38 PM CDT
- In force
- 33 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL
The radar
The St Louis radar (KLSX), 79 km from the middle of the area, began a volume at 02:08 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, 9:17 PM CDT | HAIL 0.5 | 3 S Hecker, IL | |
| Apr 28, 9:20 PM CDT | HAIL 0.88 | 1 N Red Bud, 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, 2.1 hours before the alert went out and 237 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.
921 WUUS53 KLSX 290205 SVRLSX ILC133-157-163-290245- /O.NEW.KLSX.SV.W.0129.120429T0205Z-120429T0245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 905 PM CDT SAT APR 28 2012 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN MONROE COUNTY IN SOUTHWEST ILLINOIS... NORTH CENTRAL RANDOLPH COUNTY IN SOUTHWEST ILLINOIS... SOUTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS... * UNTIL 945 PM CDT * AT 903 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR NEW DESIGN...AND MOVING EAST AT 30 MPH. HAZARD...PING PONG BALL SIZE HAIL. SOURCE...TRAINED WEATHER SPOTTERS. IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS. PING PONG BALL SIZE HAIL WAS REPORTED IN WARTBURG WITH THIS STORM. * LOCATIONS IMPACTED INCLUDE... RED BUD...NEW ATHENS...BALDWIN...FLORAVILLE...PADERBORN...HECKER... PRAIRIE AND LENZBURG. PRECAUTIONARY/PREPAREDNESS ACTIONS... FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A BUILDING. && LAT...LON 3834 8974 3812 8984 3823 9023 3841 9016 TIME...MOT...LOC 0205Z 285DEG 26KT 3827 9010 HAIL...1.50IN WIND...<50 MPH $$ KANOFSKY
2 follow-up statements
724 WWUS53 KLSX 290216 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 916 PM CDT SAT APR 28 2012 ILC133-157-163-290245- /O.CON.KLSX.SV.W.0129.000000T0000Z-120429T0245Z/ MONROE IL-RANDOLPH IL-ST. CLAIR IL- 916 PM CDT SAT APR 28 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN ST. CLAIR...NORTH CENTRAL RANDOLPH AND EAST CENTRAL MONROE COUNTIES UNTIL 945 PM CDT... AT 913 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR RED BUD...AND MOVING EAST AT 30 MPH. HAZARD...PING PONG BALL SIZE HAIL. SOURCE...TRAINED WEATHER SPOTTERS. IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS. LOCATIONS IMPACTED INCLUDE... RED BUD...NEW ATHENS...BALDWIN...PRAIRIE AND LENZBURG. PRECAUTIONARY/PREPAREDNESS ACTIONS... FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A BUILDING. && LAT...LON 3820 9012 3840 9007 3834 8974 3812 8984 TIME...MOT...LOC 0217Z 285DEG 26KT 3825 8999 HAIL...1.50IN WIND...<50 MPH $$ KANOFSKY
127 WWUS53 KLSX 290238 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 938 PM CDT SAT APR 28 2012 ILC133-157-163-290249- /O.CAN.KLSX.SV.W.0129.000000T0000Z-120429T0245Z/ MONROE IL-RANDOLPH IL-ST. CLAIR IL- 938 PM CDT SAT APR 28 2012 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ST. CLAIR...NORTH CENTRAL RANDOLPH AND EAST CENTRAL MONROE COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM CDT. LAT...LON 3820 9012 3840 9007 3834 8974 3812 8984 TIME...MOT...LOC 0239Z 285DEG 26KT 3821 8979 $$ KANOFSKY
The 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, 9:31 PM CDT | Severe Thunderstorm Warning | LSX | Randolph, Saint Clair, Washington | 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.