Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 337, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Oct 22, 2012, 9:30 AM CDT for Greene County, Jersey County, Macoupin County, Illinois. It was in force for 45 min. 1 report 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
- Oct 22, 2012, 9:30 AM CDT (14:30 UTC)
- Expired
- Oct 22, 2012, 10:15 AM CDT
- In force
- 45 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Greene County, IL, Jersey County, IL, Macoupin County, IL
The radar
The St Louis radar (KLSX), 75 km from the middle of the area, began a volume at 14:33 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 |
|---|---|---|---|
| Oct 22, 9:31 AM CDT | HAIL 0.88 | Jerseyville, IL |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 2.5 hours before the alert went out and 169 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.
773
WUUS53 KLSX 221430
SVRLSX
ILC061-083-117-221515-
/O.NEW.KLSX.SV.W.0337.121022T1430Z-121022T1515Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
930 AM CDT MON OCT 22 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
JERSEY COUNTY IN SOUTHWEST ILLINOIS...
WESTERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
* UNTIL 1015 AM CDT
* AT 929 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
JERSEYVILLE...AND MOVING NORTHEAST AT 30 MPH.
HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
* LOCATIONS IMPACTED INCLUDE...
KEMPER...SHIPMAN...GREENFIELD...FIDELITY...PIASA...MEDORA...
ROCKBRIDGE...PLAINVIEW...CHESTERFIELD AND HETTICK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3948 9006 3917 8989 3899 9040 3911 9051
TIME...MOT...LOC 1430Z 236DEG 28KT 3914 9031
HAIL...1.00IN
WIND...60 MPH
$$
BRITT3 follow-up statements
104
WWUS53 KLSX 221444
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
944 AM CDT MON OCT 22 2012
ILC061-083-117-221515-
/O.CON.KLSX.SV.W.0337.000000T0000Z-121022T1515Z/
JERSEY IL-MACOUPIN IL-GREENE IL-
944 AM CDT MON OCT 22 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
GREENE...WESTERN MACOUPIN AND JERSEY COUNTIES UNTIL 1015 AM CDT...
AT 942 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR KEMPER...AND
MOVING EAST AT 35 MPH.
HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
LOCATIONS IMPACTED INCLUDE...
KEMPER...GREENFIELD...SHIPMAN...PIASA...MEDORA...CHESTERFIELD...
PLAINVIEW AND HETTICK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3948 9006 3917 8989 3899 9040 3911 9051
TIME...MOT...LOC 1444Z 249DEG 29KT 3917 9017
HAIL...1.00IN
WIND...60 MPH
$$
BRITT129 WWUS53 KLSX 221459 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 959 AM CDT MON OCT 22 2012 ILC061-083-221509- /O.CAN.KLSX.SV.W.0337.000000T0000Z-121022T1515Z/ JERSEY IL-GREENE IL- 959 AM CDT MON OCT 22 2012 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GREENE AND JERSEY COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED. LAT...LON 3948 9006 3917 8989 3908 9014 3940 9015 TIME...MOT...LOC 1459Z 249DEG 29KT 3921 9002 $$ ILC117-221515- /O.CON.KLSX.SV.W.0337.000000T0000Z-121022T1515Z/ MACOUPIN IL- 959 AM CDT MON OCT 22 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN MACOUPIN COUNTY UNTIL 1015 AM CDT... AT 954 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED 5 MILES EAST OF KEMPER...AND MOVING EAST AT 35 MPH. HAZARD...QUARTER SIZE HAIL. SOURCE...RADAR INDICATED. IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. LOCATIONS IMPACTED INCLUDE... HETTICK. PRECAUTIONARY/PREPAREDNESS ACTIONS... FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A BUILDING. && LAT...LON 3948 9006 3917 8989 3908 9014 3940 9015 TIME...MOT...LOC 1459Z 249DEG 29KT 3921 9002 HAIL...1.00IN WIND...<50 MPH $$ BRITT
314 WWUS53 KLSX 221510 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1010 AM CDT MON OCT 22 2012 ILC117-221520- /O.EXP.KLSX.SV.W.0337.000000T0000Z-121022T1515Z/ MACOUPIN IL- 1010 AM CDT MON OCT 22 2012 ...THE SEVERE THUNDERSTORM WARNING FOR WESTERN MACOUPIN COUNTY WILL EXPIRE AT 1015 AM CDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF THE WARNED AREA. HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM. 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 3948 9006 3917 8989 3908 9014 3940 9015 TIME...MOT...LOC 1510Z 249DEG 29KT 3924 8991 $$ 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, 10:34 AM CDT | Severe Thunderstorm Warning | LSX | Madison | 41 min |
| Oct 22, 11:38 AM CDT | Severe Thunderstorm Warning | LSX | Clinton, Madison, Saint Clair | 37 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.