Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 339, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Oct 22, 2012, 11:38 AM CDT for Clinton County, Madison County, Saint Clair County, Illinois. It was in force for 37 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
- Oct 22, 2012, 11:38 AM CDT (16:38 UTC)
- Expired
- Oct 22, 2012, 12:15 PM CDT
- In force
- 37 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Clinton County, IL, Madison 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 16:41 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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 4.6 hours before the alert went out and 188 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
- 620 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 276 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
405 WUUS53 KLSX 221638 SVRLSX ILC027-119-163-221715- /O.NEW.KLSX.SV.W.0339.121022T1638Z-121022T1715Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 1138 AM CDT MON OCT 22 2012 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WEST CENTRAL CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS... SOUTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS... NORTHEASTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS... * UNTIL 1215 PM CDT * AT 1137 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR O'FALLON... AND MOVING EAST AT 35 MPH. HAZARD...QUARTER SIZE HAIL. SOURCE...RADAR INDICATED. IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. * LOCATIONS IMPACTED INCLUDE... TROY...LEBANON...HIGHLAND...ST. JACOB...MARINE...TRENTON... AVISTON...SUMMERFIELD AND GRANTFORK. PRECAUTIONARY/PREPAREDNESS ACTIONS... FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A BUILDING. && LAT...LON 3887 8960 3860 8959 3856 9001 3871 9007 TIME...MOT...LOC 1638Z 253DEG 30KT 3866 8990 HAIL...1.00IN WIND...<50 MPH $$ BRITT
2 follow-up statements
889 WWUS53 KLSX 221652 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1152 AM CDT MON OCT 22 2012 ILC027-119-163-221715- /O.CON.KLSX.SV.W.0339.000000T0000Z-121022T1715Z/ MADISON IL-ST. CLAIR IL-CLINTON IL- 1152 AM CDT MON OCT 22 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN CLINTON...NORTHEASTERN ST. CLAIR AND SOUTHEASTERN MADISON COUNTIES UNTIL 1215 PM CDT... AT 1150 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ST. JACOB... AND MOVING EAST AT 35 MPH. HAZARD...QUARTER SIZE HAIL. SOURCE...RADAR INDICATED. IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. LOCATIONS IMPACTED INCLUDE... HIGHLAND...MARINE...TRENTON...AVISTON AND GRANTFORK. PRECAUTIONARY/PREPAREDNESS ACTIONS... FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A BUILDING. && LAT...LON 3887 8960 3860 8959 3856 9001 3871 9007 TIME...MOT...LOC 1652Z 253DEG 30KT 3869 8976 HAIL...1.00IN WIND...<50 MPH $$ BRITT
702 WWUS53 KLSX 221712 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1212 PM CDT MON OCT 22 2012 ILC027-119-163-221719- /O.EXP.KLSX.SV.W.0339.000000T0000Z-121022T1715Z/ MADISON IL-ST. CLAIR IL-CLINTON IL- 1212 PM CDT MON OCT 22 2012 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CLINTON... NORTHEASTERN ST. CLAIR AND SOUTHEASTERN MADISON COUNTIES WILL EXPIRE AT 1215 PM CDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. STRONG THUNDERSTORMS CONTINUE TO MOVE EAST ACROSS PARTS OF MADISON AND ST. CLAIR COUNTIES AND MAY CONTINUE TO PRODUCE HAIL UP TO NICKEL SIZE THROUGH 1230 PM CDT. LAT...LON 3887 8960 3860 8959 3856 9001 3871 9007 TIME...MOT...LOC 1709Z 253DEG 30KT 3873 8959 $$ BRITT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 22, 6:20 AM CDT | Severe Thunderstorm Warning | LSX | Adams | 55 min |
| Oct 22, 6:56 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 49 min |
| Oct 22, 7:43 AM CDT | Severe Thunderstorm Warning | LSX | Pike | 47 min |
| Oct 22, 9:30 AM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin | 45 min |
| Oct 22, 10:34 AM CDT | Severe Thunderstorm Warning | LSX | Madison | 41 min |
| Oct 22, 2:04 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 24 min |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.