Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 331, NWS St. Louis, MO

June 17, 20116 counties in Illinois; Sainte Genevieve County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 17, 2011, 12:50 PM CDT for 6 counties in Illinois; Sainte Genevieve County, Missouri. It was in force for 40 min. 14 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: Jun 17, 2011, 12:50 PM CDT (17:50 UTC)
Expired: Jun 17, 2011, 1:30 PM CDT
In force: 40 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, IL, Madison County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 105 km from the middle of the area, began a volume at 17:52 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
Jun 17, 12:50 PM CDT	TSTM WND DMG	New Athens, IL	TREES AND POWER LINES DOWNED...TREES OF UNKNOWN SIZE
Jun 17, 12:51 PM CDT	TSTM WND GST 55	New Baden, IL	FREQUENT GUSTS BETWEEN 40-50 MPH
Jun 17, 12:51 PM CDT	HAIL 0.25	New Baden, IL	FREQUENT GUSTS BETWEEN 40-50 MPH
Jun 17, 12:55 PM CDT	HAIL 0.25	Marissa, IL	ALSO OBSERVED WINDS ESTIMATED BETWEEN 45 AND 50 MILES PER HOUR WITH 2 INCH DIAMETER BRANCHES DOWN
Jun 17, 1:00 PM CDT	TSTM WND DMG	Marissa, IL	METAL ROOF TORN OFF STORAGE SHED
Jun 17, 1:02 PM CDT	TSTM WND GST 42	Ellis Grove, IL
Jun 17, 1:02 PM CDT	HAIL 0.25	Ellis Grove, IL
Jun 17, 1:05 PM CDT	TSTM WND DMG	Aviston, IL	SHED SEVERELY DAMAGED BY THUNDERSTORM WIND GUST
Jun 17, 1:07 PM CDT	TSTM WND DMG	Breese, IL	4 TO 5 INCH DIAMETER TREE LIMBS DOWN IN TOWN
Jun 17, 1:15 PM CDT	TSTM WND DMG	Trenton, IL	POWER LINES DOWN IN TOWN .
Jun 17, 1:15 PM CDT	TSTM WND GST 60	Hoyleton, IL
Jun 17, 1:19 PM CDT	TSTM WND GST 40	Hoyleton, IL
Jun 17, 1:30 PM CDT	HAIL 0.25	Du Bois, IL
Jun 17, 1:35 PM CDT	TSTM WND DMG	Carlyle, IL	TREE DAMAGE WHERE EIGHT INCH DIAMETER LIMBS WERE BLOWN DOWN

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, 5.8 hours before the alert went out and 252 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: 786 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

338 
WUUS53 KLSX 171750
SVRLSX
ILC027-119-133-157-163-189-MOC186-171830-
/O.NEW.KLSX.SV.W.0331.110617T1750Z-110617T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1250 PM CDT FRI JUN 17 2011

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...
  SOUTHEASTERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
  EASTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  EASTERN STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...

* UNTIL 130 PM CDT

* AT 1248 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM O'FALLON TO NEW ATHENS TO
  EVANSVILLE TO COFFMAN...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SCOTT AFB...LEBANON...MASCOUTAH...NEW BADEN...SPARTA...CHESTER...
  BREESE...CARLYLE...NASHVILLE...NEW ATHENS...EVANSVILLE...BALDWIN...
  ST. MARY...MARISSA...TRENTON...NEW MEMPHIS...TILDEN...BREMEN...
  AVISTON AND ALBERS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3822 8959 3795 8959 3781 8967 3785 8979
      3790 8985 3787 8990 3787 8994 3772 9007
      3776 9030 3806 9009 3836 8999 3871 8995
      3864 8914 3822 8914
TIME...MOT...LOC 1749Z 284DEG 39KT 3863 8987 3834 8988
          3803 8997 3782 9014
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

1 follow-up statement

864 
WWUS53 KLSX 171822
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
122 PM CDT FRI JUN 17 2011

ILC119-133-163-171832-
/O.CAN.KLSX.SV.W.0331.000000T0000Z-110617T1830Z/
MADISON IL-MONROE IL-ST. CLAIR IL-
122 PM CDT FRI JUN 17 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ST. CLAIR...
SOUTHEASTERN MONROE AND SOUTHEASTERN MADISON COUNTIES IS CANCELLED...

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

LAT...LON 3822 8959 3795 8959 3781 8967 3783 8974
      3784 8974 3785 8979 3790 8984 3787 8990
      3790 9005 3807 8986 3830 8964 3868 8960
      3864 8914 3822 8914
TIME...MOT...LOC 1822Z 284DEG 39KT 3854 8943 3825 8944
          3794 8953 3773 8970

$$

ILC027-157-189-MOC186-171830-
/O.CON.KLSX.SV.W.0331.000000T0000Z-110617T1830Z/
RANDOLPH IL-WASHINGTON IL-CLINTON IL-STE. GENEVIEVE MO-
122 PM CDT FRI JUN 17 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
STE. GENEVIEVE...CLINTON...WASHINGTON AND RANDOLPH COUNTIES UNTIL 130
PM CDT...

AT 120 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM BECKEMEYER TO 8 MILES SOUTHWEST
OF NASHVILLE TO WILLISVILLE TO 8 MILES EAST OF PERRYVILLE...MOVING
EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  CARLYLE...NASHVILLE...ASHLEY...IRVINGTON...SHATTUC...WAMAC...
  COVINGTON...NEW MINDEN...POSEY...HUEGELY...POSEN...BEAUCOUP...
  HOYLETON...HOFFMAN...HUEY...DU BOIS...RADOM...RICHVIEW AND FERRIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3822 8959 3795 8959 3781 8967 3783 8974
      3784 8974 3785 8979 3790 8984 3787 8990
      3790 9005 3807 8986 3830 8964 3868 8960
      3864 8914 3822 8914
TIME...MOT...LOC 1822Z 284DEG 39KT 3854 8943 3825 8944
          3794 8953 3773 8970
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 12:15 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	45 min
Jun 17, 12:33 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair	27 min
Jun 17, 12:44 PM CDT	Areal Flood Advisory	LSX	Bond, Clinton, Fayette, Madison, Marion, Monroe and 3 more	5 hr
Jun 17, 1:28 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion, Randolph, Washington	47 min
Jun 17, 9:23 AM CDT	Severe Thunderstorm Warning	LSX	Montgomery, Warren	37 min
Jun 17, 9:35 AM CDT	Severe Thunderstorm Warning	LSX	Osage	39 min
Jun 17, 10:48 AM CDT	Areal Flood Advisory	LSX	Audrain, Boone	4 hr
Jun 17, 11:12 AM CDT	Areal Flood Advisory	LSX	Lincoln, Montgomery, Warren	4 hr
Jun 17, 11:51 AM CDT	Areal Flood Advisory	LSX	Saint Charles, Saint Louis, City of Saint Louis	3 hr
Jun 17, 12:25 PM CDT	Flash Flood Warning	LSX	Saint Louis, City of Saint Louis	5 hr
Jun 17, 4:44 PM CDT	River Flood Warning	LSX	Saint Charles	3 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2011 Severe Thunderstorm Warnings in Missouri, 2011 Every severe thunderstorm warning in 2011

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.