Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 321, NWS St. Louis, MO

September 25, 20124 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 25, 2012, 6:45 PM CDT for 4 counties in Illinois. It was in force for 45 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 25, 2012, 6:45 PM CDT (23:45 UTC)
Expired: Sep 25, 2012, 7:30 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, IL, Madison County, IL, Marion County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 130 km from the middle of the area, began a volume at 23:46 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 25, 7:14 PM CDT	HAIL 0.5	3 W Centralia, IL	ALSO WITH STRONG WINDS.
Sep 25, 7:24 PM CDT	HAIL 0.7	3 N Nashville, IL	INTERSECTION OF I64 AND IL HWY 127

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 25, 5:05 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 185 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 221 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

171 
WUUS53 KLSX 252345 RRA
SVRLSX
ILC027-119-121-189-260030-
/O.NEW.KLSX.SV.W.0321.120925T2345Z-120926T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
645 PM CDT TUE SEP 25 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHWESTERN MARION COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTHERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 730 PM CDT

* AT 639 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
  LINE EXTENDING FROM TROY TO SCOTT AFB TO FREEBURG...AND MOVING EAST
  AT 50 MPH.  ADDITIONAL SEVERE THUNDERSTORMS EXIST OVER SECTIONS OF 
  MARION...CLINTON...AND WASHINGTON COUNTIES. 

  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...
  NEW BADEN...HIGHLAND...BREESE...CARLYLE...CENTRALIA...SALEM...
  TRENTON...NEW MEMPHIS...ALBERS...AVISTON...GERMANTOWN...ST. ROSE...
  OKAWVILLE...JAMESTOWN...BECKEMEYER...SHATTUC...BOULDER...
  SANDOVAL...CENTRAL CITY AND WAMAC.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS WARNING REPLACES OTHER WARNINGS IN EFFECT FOR THESE LOCATIONS.

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 3847 8893 3847 8914 3837 8914 3836 8970
      3874 8970 3874 8914 3875 8913 3861 8892
TIME...MOT...LOC 2344Z 266DEG 44KT 3867 8980 3855 8972
          3845 8980

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60 MPH

$$

TES

2 follow-up statements

736 
WWUS53 KLSX 260000
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
700 PM CDT TUE SEP 25 2012

ILC027-119-121-189-260030-
/O.CON.KLSX.SV.W.0321.000000T0000Z-120926T0030Z/
MADISON IL-MARION IL-WASHINGTON IL-CLINTON IL-
700 PM CDT TUE SEP 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CLINTON...
NORTHERN WASHINGTON...SOUTHWESTERN MARION AND SOUTHEASTERN MADISON
COUNTIES UNTIL 730 PM CDT...

AT 659 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM ST. ROSE TO GERMANTOWN TO OKAWVILLE...AND MOVING
EAST AT 50 MPH.

HAZARD...GOLF BALL SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE DAMAGE...
         WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.

LOCATIONS IMPACTED INCLUDE...
CARLYLE...CENTRALIA...SALEM...OKAWVILLE...JAMESTOWN...BECKEMEYER...
SHATTUC...BOULDER...CENTRAL CITY...SANDOVAL...WAMAC...IRVINGTON...
FAIRMAN...ODIN...BARTELSO...FROGTOWN...ADDIEVILLE...STOLLETOWN...
COVINGTON AND POSEY.

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 3847 8893 3847 8914 3837 8914 3836 8970
      3874 8970 3874 8914 3875 8913 3861 8892
TIME...MOT...LOC 0000Z 266DEG 44KT 3868 8955 3856 8947
          3846 8955

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60 MPH

$$

TES

194 
WWUS53 KLSX 260032
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
732 PM CDT TUE SEP 25 2012

ILC027-119-121-189-260041-
/O.EXP.KLSX.SV.W.0321.000000T0000Z-120926T0030Z/
MADISON IL-MARION IL-WASHINGTON IL-CLINTON IL-
732 PM CDT TUE SEP 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR CLINTON AND SOUTHEASTERN 
MADISON COUNTIES HAS EXPIRED... 
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WASHINGTON AND  
SOUTHWESTERN MARION COUNTIES HAS BEEN REISSUED...

PLEASE REFER TO THE SEVERE THUNDERSTORM BULLETIN FOR THE LATEST 
SEVERE WEATHER INFORMATION.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 11 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 3847 8893 3847 8914 3837 8914 3836 8970
      3874 8970 3874 8914 3875 8913 3861 8892
TIME...MOT...LOC 0000Z 266DEG 44KT 3868 8955 3856 8947
          3846 8955

$$

TES

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 25, 3:38 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion	22 min
Sep 25, 4:36 AM CDT	Areal Flood Advisory	LSX	Pike	5 hr
Sep 25, 4:29 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	46 min
Sep 25, 4:39 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair	51 min
Sep 25, 5:05 PM CDT	Severe Thunderstorm Warning	LSX	Clinton	55 min
Sep 25, 5:07 PM CDT	Tornado Warning	LSX	Clinton	23 min
Sep 25, 5:09 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Madison	51 min
Sep 25, 5:12 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair	18 min
Sep 25, 5:19 PM CDT	Tornado Warning	LSX	Washington	26 min
Sep 25, 5:28 PM CDT	Severe Thunderstorm Warning	LSX	Marion	47 min
Sep 25, 5:34 PM CDT	Tornado Warning Tornado observed	LSX	Washington	41 min
Sep 25, 5:43 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	62 min
Sep 25, 6:08 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	52 min
Sep 25, 6:14 PM CDT	Severe Thunderstorm Warning	LSX	Washington	46 min
Sep 25, 6:19 PM CDT	Areal Flood Advisory	LSX	Clinton, Marion, Washington	6 hr
Sep 25, 6:30 PM CDT	Severe Thunderstorm Warning	LSX	Marion	26 min
Sep 25, 6:50 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	46 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2012 Every 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.