Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 301, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Sep 7, 2012, 6:50 PM CDT for Clinton County, Saint Clair County, Washington County, Illinois. It was in force for 40 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
- Sep 7, 2012, 6:50 PM CDT (23:50 UTC)
- Expired
- Sep 7, 2012, 7:30 PM CDT
- In force
- 40 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Clinton County, IL, Saint Clair County, IL, Washington County, IL
The radar
The St Louis radar (KLSX), 115 km from the middle of the area, began a volume at 23:51 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 |
|---|---|---|---|
| Sep 7, 7:08 PM CDT | TSTM WND DMG | Nashville, IL | NUMEROUS TREES OF UNKNOWN SIZE BLOWN DOWN ALONG RT 15 NEAR THREE WAY FARMS. TIME ESTIMATED FROM RADAR. |
| Sep 7, 7:15 PM CDT | TSTM WND DMG | Nashville, IL | ONE TO TWO INCH TREE LIMBS BLOWN DOWN AROUND TOWN. |
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 |
|---|---|---|---|
| Sep 7, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 11.8 hours before the alert went out and 211 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
- 367 J/kg
- Mixed-layer CIN
- -412 J/kg
- Mixed-layer LCL
- 1436 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
035
WUUS53 KLSX 072350
SVRLSX
ILC027-163-189-080030-
/O.NEW.KLSX.SV.W.0301.120907T2350Z-120908T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
650 PM CDT FRI SEP 7 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
SOUTHEASTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...
* UNTIL 730 PM CDT
* AT 647 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM CARLYLE TO OKAWVILLE TO NEW ATHENS...AND MOVING
SOUTHEAST AT 30 MPH.
HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL.
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...
NASHVILLE...OKAWVILLE...LIVELY GROVE...WAMAC...IRVINGTON...
ASHLEY...VENEDY...ST. LIBORY...JOHANNISBURG...POSEY...FROGTOWN...
COVINGTON...STONE CHURCH...HOFFMAN...ADDIEVILLE...NEW MINDEN...
HOYLETON...HUEGELY...ELKTON AND CORDES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST
LOUIS.
&&
LAT...LON 3821 8915 3822 8970 3836 8985 3847 8960
3859 8941 3852 8914
TIME...MOT...LOC 2350Z 294DEG 26KT 3858 8936 3843 8959
3834 8983
HAIL...0.75IN
WIND...60 MPH
$$
TES1 follow-up statement
452
WWUS53 KLSX 080032
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
732 PM CDT FRI SEP 7 2012
ILC027-163-189-080042-
/O.EXP.KLSX.SV.W.0301.000000T0000Z-120908T0030Z/
ST. CLAIR IL-WASHINGTON IL-CLINTON IL-
732 PM CDT FRI SEP 7 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CLINTON...WASHINGTON
AND SOUTHEASTERN ST. CLAIR COUNTIES HAS EXPIRED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA. HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THESE
THUNDERSTORMS.
IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 10 PM CDT.
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.
LAT...LON 3821 8915 3822 8970 3836 8985 3847 8960
3859 8941 3852 8914
TIME...MOT...LOC 2350Z 294DEG 26KT 3858 8936 3843 8959
3834 8983
$$
TESThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 3:36 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 54 min |
| Sep 7, 4:00 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey | 45 min |
| Sep 7, 4:11 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 24 min |
| Sep 7, 4:32 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 43 min |
| Sep 7, 4:58 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair, Washington | 47 min |
| Sep 7, 5:36 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Madison, Montgomery | 54 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.