Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 309, NWS St. Louis, MO

September 25, 2012Clinton County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 25, 2012, 5:05 PM CDT for Clinton County, Illinois. It was in force for 55 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: Sep 25, 2012, 5:05 PM CDT (22:05 UTC)
Expired: Sep 25, 2012, 6:00 PM CDT
In force: 55 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

County Clinton County, IL

The radar

The St Louis radar (KLSX), 118 km from the middle of the area, began a volume at 22:08 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.

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, 10.1 hours before the alert went out and 180 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.

629 
WUUS53 KLSX 252205
SVRLSX
ILC027-252300-
/O.NEW.KLSX.SV.W.0309.120925T2205Z-120925T2300Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 600 PM CDT

* AT 503 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR AVISTON...
  AND MOVING EAST AT 20 MPH.

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

  SOURCE...TRAINED WEATHER SPOTTERS REPORTED HAIL TO PING PONG BALL 
           SIZED HAIL NEAR NEW BADEN AT 456 PM.

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

* LOCATIONS IMPACTED INCLUDE...
  CARLYLE...BECKEMEYER...SHATTUC...BOULDER...BARTELSO...STOLLETOWN...
  POSEY...HUEY...HOFFMAN AND FERRIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

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 3853 8950 3873 8952 3874 8916 3873 8915
      3851 8914
TIME...MOT...LOC 2204Z 260DEG 19KT 3858 8962

HAIL...1.75IN
WIND...60 MPH

$$

TES

2 follow-up statements

329 
WWUS53 KLSX 252222
SVSLSX

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

ILC027-252300-
/O.CON.KLSX.SV.W.0309.000000T0000Z-120925T2300Z/
CLINTON IL-
522 PM CDT TUE SEP 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
CLINTON COUNTY UNTIL 600 PM CDT...

AT 522 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR CARLYLE...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...
BOULDER...SHATTUC...HUEY...HOFFMAN AND FERRIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

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 3853 8950 3873 8952 3874 8916 3873 8915
      3851 8914
TIME...MOT...LOC 2223Z 269DEG 31KT 3867 8931

HAIL...1.00IN
WIND...60 MPH

$$

TES

939 
WWUS53 KLSX 252259
SVSLSX

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

ILC027-252309-
/O.EXP.KLSX.SV.W.0309.000000T0000Z-120925T2300Z/
CLINTON IL-
559 PM CDT TUE SEP 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR CLINTON COUNTY HAS BEEN 
REISSUED FOR THE SOUTHERN PORTION OF CLINTON COUNTY...

PLEASE REFER TO THAT 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 3853 8950 3873 8952 3874 8916 3873 8915
      3851 8914
TIME...MOT...LOC 2259Z 269DEG 31KT 3868 8891

$$

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, 5:07 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, 6:45 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Marion, Washington	45 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.