Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 256, NWS St. Louis, MO

August 16, 2012Clinton County, Marion County, Washington County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 16, 2012, 4:49 PM CDT for Clinton County, Marion County, Washington County, Illinois. It was in force for 56 min. 5 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: Aug 16, 2012, 4:49 PM CDT (21:49 UTC)
Expired: Aug 16, 2012, 5:45 PM CDT
In force: 56 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, Marion County, IL, Washington County, IL

What was reported inside it

Time	Report	Where	Remark
Aug 16, 5:10 PM CDT	TSTM WND GST 58	3 Nw Walnut Hill, IL
Aug 16, 5:20 PM CDT	TSTM WND DMG	2 Ne Walnut Hill, IL	56 MPH MEASURED WIND GUST. TREE LIMBS DOWN. PEA TO NICKEL SIZE HAIL.
Aug 16, 5:20 PM CDT	TSTM WND DMG	Centralia, IL	SCATTERED TREE BRANCHES UP TO 6 INCHES DOWN ACROSS TOWN. TREE DOWN BLOCKING A SIDE ROAD AS WELL.
Aug 16, 5:20 PM CDT	HAIL 0.88	2 Ne Walnut Hill, IL	56 MPH MEASURED WIND GUST. TREE LIMBS DOWN. PEA TO NICKEL SIZE HAIL.
Aug 16, 5:30 PM CDT	TSTM WND DMG	2 S Hoffman, IL	NUMEROUS 1.5 FOOT DIAMETER TREES REPORTED DOWN.

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
Aug 16, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.8 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: 817 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

910 
WUUS53 KLSX 162149
SVRLSX
ILC027-121-189-162245-
/O.NEW.KLSX.SV.W.0256.120816T2149Z-120816T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
449 PM CDT THU AUG 16 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 545 PM CDT

* AT 447 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
  LINE EXTENDING FROM 7 MILES EAST OF STEPHEN FORBES STATE PARK TO
  SHATTUC TO LIVELY GROVE...AND MOVING EAST AT 45 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...
  SALEM...NASHVILLE...CENTRALIA...SHATTUC...OMEGA...SANDOVAL...
  ODIN...CENTRAL CITY...WAMAC...IRVINGTON...ASHLEY...HELM...
  BRUBAKER...ELKTON...TONTI...ADDIEVILLE...HOFFMAN...OAKDALE...NEW
  MINDEN AND CORDES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

&&

LAT...LON 3847 8914 3822 8914 3822 8970 3865 8970
      3874 8914 3882 8913 3883 8870 3848 8869
TIME...MOT...LOC 2148Z 270DEG 40KT 3876 8863 3860 8925
          3833 8959

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

$$

BRITT

4 follow-up statements

725 
WWUS53 KLSX 162206
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
506 PM CDT THU AUG 16 2012

ILC027-121-189-162245-
/O.CON.KLSX.SV.W.0256.000000T0000Z-120816T2245Z/
MARION IL-WASHINGTON IL-CLINTON IL-
506 PM CDT THU AUG 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
CLINTON...WASHINGTON AND MARION COUNTIES UNTIL 545 PM CDT...

AT 504 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM HELM TO WAMAC TO 5 MILES NORTHEAST OF
COULTERVILLE...AND MOVING SOUTHEAST 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...
WAMAC...IRVINGTON...HELM...ASHLEY...BEAUCOUP...WALNUT HILL...POSEN...
KELL...RICHVIEW...RADOM AND DU BOIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

&&

LAT...LON 3847 8914 3822 8914 3822 8970 3849 8954
      3863 8939 3874 8905 3877 8870 3848 8869
TIME...MOT...LOC 2206Z 296DEG 26KT 3856 8869 3851 8919
          3822 8951

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

$$

BRITT

782 
WWUS53 KLSX 162218
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
518 PM CDT THU AUG 16 2012

ILC027-121-189-162245-
/O.CON.KLSX.SV.W.0256.000000T0000Z-120816T2245Z/
MARION IL-WASHINGTON IL-CLINTON IL-
518 PM CDT THU AUG 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
CLINTON...WASHINGTON AND MARION COUNTIES UNTIL 545 PM CDT...

AT 512 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM HELM TO WAMAC TO 8 MILES EAST OF COULTERVILLE...
AND MOVING SOUTHEAST AT 30 MPH.

HAZARD...60 MPH WIND GUSTS AND NICKEL SIZE HAIL.

SOURCE...AIRPORT OBSERVATION.  AT 510 PM CDT...THE AIRPORT WIND
         SENSOR AT THE CENTRALIA AIRPORT REPORTED A WIND GUST OF
         58 MPH.

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

LOCATIONS IMPACTED INCLUDE...
ASHLEY...KELL...WALNUT HILL...RICHVIEW...RADOM AND DU BOIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

&&

LAT...LON 3847 8914 3822 8914 3822 8970 3849 8954
      3863 8939 3874 8905 3877 8870 3848 8869
TIME...MOT...LOC 2216Z 296DEG 26KT 3853 8861 3848 8911
          3819 8943

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60 MPH

$$

BRITT

947 
WWUS53 KLSX 162228
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
528 PM CDT THU AUG 16 2012

ILC027-121-162237-
/O.CAN.KLSX.SV.W.0256.000000T0000Z-120816T2245Z/
MARION IL-CLINTON IL-
528 PM CDT THU AUG 16 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CLINTON AND
MARION COUNTIES IS CANCELLED...

THE LINE THAT PROMPTED THE WARNING HAS MOVED OUT OF CLINTON AND 
MARION COUNTIES.  ADDITIONAL STRONG THUNDERSTORMS ARE POSSIBLE... 
AND A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM CDT.

LAT...LON 3849 8925 3847 8914 3822 8914 3822 8927
      3822 8945
TIME...MOT...LOC 2227Z 296DEG 26KT 3849 8852 3844 8902
          3816 8934

$$

ILC189-162245-
/O.CON.KLSX.SV.W.0256.000000T0000Z-120816T2245Z/
WASHINGTON IL-
528 PM CDT THU AUG 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
WASHINGTON COUNTY UNTIL 545 PM CDT...

AT 525 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM 10 MILES EAST OF HELM TO 7 MILES SOUTHEAST OF
WAMAC TO 6 MILES NORTH OF PINCKNEYVILLE...AND MOVING SOUTHEAST AT 30
MPH.

HAZARD...60 MPH WIND GUSTS AND NICKEL 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...
DU BOIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

&&

LAT...LON 3849 8925 3847 8914 3822 8914 3822 8927
      3822 8945
TIME...MOT...LOC 2227Z 296DEG 26KT 3849 8852 3844 8902
          3816 8934

HAIL...0.88IN
WIND...60 MPH

$$

BRITT

597 
WWUS53 KLSX 162239
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
539 PM CDT THU AUG 16 2012

ILC189-162249-
/O.EXP.KLSX.SV.W.0256.000000T0000Z-120816T2245Z/
WASHINGTON IL-
539 PM CDT THU AUG 16 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WASHINGTON COUNTY WILL
EXPIRE AT 545 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 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 3849 8925 3847 8914 3822 8914 3822 8927
      3822 8945
TIME...MOT...LOC 2239Z 296DEG 26KT 3845 8842 3840 8892
          3812 8924

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 2:11 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene	39 min
Aug 16, 3:08 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	37 min
Aug 16, 3:18 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	42 min
Aug 16, 3:28 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	47 min
Aug 16, 3:43 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	47 min
Aug 16, 3:43 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	47 min
Aug 16, 3:52 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison	38 min
Aug 16, 4:07 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion	53 min
Aug 16, 4:25 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	35 min
Aug 16, 4:26 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	24 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.