Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 463, NWS St. Louis, MO

July 12, 20117 counties in Illinois; Lincoln County, Saint Charles County, Saint Louis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 12, 2011, 5:03 PM CDT for 7 counties in Illinois; Lincoln County, Saint Charles County, Saint Louis County, Missouri. It was in force for 57 min. 6 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: Jul 12, 2011, 5:03 PM CDT (22:03 UTC)
Expired: Jul 12, 2011, 6:00 PM CDT
In force: 57 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL, Pike County, IL, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 74 km from the middle of the area, began a volume at 22:03 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
Jul 12, 5:10 PM CDT	TSTM WND GST 45	Greenfield, IL
Jul 12, 5:11 PM CDT	TSTM WND GST 70	Greenfield, IL	LARGE TREES UPROOTED AND SNAPPED OFF. POWER LINES ALSO DAMAGED.
Jul 12, 5:16 PM CDT	TSTM WND DMG	Greenfield, IL	NUMEROUS SMALL TREES DOWN WITH ESTIMATED 60 MPH WINDS.
Jul 12, 5:18 PM CDT	TSTM WND GST 53	4 Nne Orchard Farms, MO	GUSTS WITH OUTFLOW
Jul 12, 5:22 PM CDT	TSTM WND GST 53	4 Nne Orchard Farms, MO
Jul 12, 5:33 PM CDT	TSTM WND GST 45	1 N Carlinville, IL

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
Jul 12, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.1 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: 1615 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

879 
WUUS53 KLSX 122203
SVRLSX
ILC013-061-083-117-119-135-149-MOC113-183-189-122300-
/O.NEW.KLSX.SV.W.0463.110712T2203Z-110712T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
503 PM CDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  GREENE COUNTY IN SOUTHWEST ILLINOIS...
  JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  WEST CENTRAL MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...
  EASTERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 600 PM CDT

* AT 458 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 9 MILES EAST OF PITTSFIELD TO CARROLLTON TO WINFIELD...AND
  MOVING EAST AT 40 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE
  DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  WHITE HALL...JERSEYVILLE...GODFREY...ALTON...CARLINVILLE...WOOD
  RIVER...BETHALTO...GILLESPIE...LITCHFIELD...STAUNTON...VIRDEN...
  EDWARDSVILLE...GLEN CARBON...OLD KANE...ROODHOUSE...GREENFIELD...
  ORCHARD FARMS...GRAFTON...KEMPER AND ELSAH.

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.

&&

LAT...LON 3967 9062 3958 9058 3953 9057 3953 8972
      3920 8963 3873 8986 3894 9090 3923 9078
      3923 9072 3926 9073 3927 9076 3932 9074
      3968 9076
TIME...MOT...LOC 2203Z 278DEG 34KT 3959 9059 3928 9038
          3905 9066
WIND...HAIL 60MPH 0.75IN

$$

KANOFSKY

2 follow-up statements

800 
WWUS53 KLSX 122237
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
537 PM CDT TUE JUL 12 2011

ILC013-083-119-149-MOC113-183-189-122247-
/O.CAN.KLSX.SV.W.0463.000000T0000Z-110712T2300Z/
JERSEY IL-MADISON IL-PIKE IL-CALHOUN IL-LINCOLN MO-ST. CHARLES MO-
ST. LOUIS MO-
537 PM CDT TUE JUL 12 2011

...THE SEVERE THUNDERSTORM WARNING FOR CALHOUN...WESTERN MADISON AND
JERSEY COUNTIES IN SOUTHWEST ILLINOIS...AND SOUTHEASTERN PIKE COUNTY
IN WEST CENTRAL ILLINOIS...AND NORTHEASTERN ST. LOUIS...NORTHEASTERN
ST. CHARLES AND EASTERN LINCOLN COUNTIES IN EAST CENTRAL MISSOURI IS
CANCELLED...

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

LAT...LON 3906 8970 3921 9015 3926 9015 3926 9020
      3923 9020 3934 9060 3953 9053 3953 8972
      3920 8963
TIME...MOT...LOC 2237Z 258DEG 29KT 3945 9045 3934 9000
          3916 8969

$$

ILC061-117-135-122300-
/O.CON.KLSX.SV.W.0463.000000T0000Z-110712T2300Z/
MACOUPIN IL-MONTGOMERY IL-GREENE IL-
537 PM CDT TUE JUL 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR GREENE...WEST
CENTRAL MONTGOMERY AND MACOUPIN COUNTIES UNTIL 600 PM CDT...

AT 532 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 5 MILES WEST OF WHITE HALL TO 8 MILES SOUTH OF PALMYRA TO
GILLESPIE...MOVING EAST AT 35 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY
THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  CARLINVILLE...LITCHFIELD...VIRDEN...ROODHOUSE...ATHENSVILLE...
  PALMYRA...GIRARD...HETTICK...BARROW...STANDARD CITY...ATWATER...
  NILWOOD...SCOTTVILLE AND MODESTO.

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.

&&

LAT...LON 3906 8970 3921 9015 3926 9015 3926 9020
      3923 9020 3934 9060 3953 9053 3953 8972
      3920 8963
TIME...MOT...LOC 2237Z 258DEG 29KT 3945 9045 3934 9000
          3916 8969
WIND...HAIL 60MPH 0.75IN

$$

KANOFSKY

060 
WWUS53 KLSX 122251
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
551 PM CDT TUE JUL 12 2011

ILC061-117-135-122301-
/O.EXP.KLSX.SV.W.0463.000000T0000Z-110712T2300Z/
MACOUPIN IL-MONTGOMERY IL-GREENE IL-
551 PM CDT TUE JUL 12 2011

...THE SEVERE THUNDERSTORM WARNING FOR GREENE...WEST CENTRAL
MONTGOMERY AND MACOUPIN COUNTIES WILL EXPIRE AT 600 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY.  HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH
THESE THUNDERSTORMS.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 9 PM.

LAT...LON 3906 8970 3921 9015 3926 9015 3926 9020
      3923 9020 3934 9060 3953 9053 3953 8972
      3920 8963
TIME...MOT...LOC 2251Z 258DEG 29KT 3947 9031 3936 8986
          3918 8955

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 2:25 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	26 min
Jul 12, 2:31 PM CDT	Flash Flood Warning	LSX	Madison, Saint Clair	3 hr
Jul 12, 3:20 PM CDT	Areal Flood Advisory	LSX	Adams	102 min
Jul 12, 3:23 PM CDT	Areal Flood Advisory	LSX	Marion, Washington	3 hr
Jul 12, 3:38 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	52 min
Jul 12, 3:44 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	46 min
Jul 12, 4:06 PM CDT	Flash Flood Warning	LSX	Marion	3 hr
Jul 12, 4:18 PM CDT	Severe Thunderstorm Warning	LSX	Marion	27 min
Jul 12, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Brown, Calhoun, Greene, Jersey, Pike	44 min
Jul 12, 4:44 PM CDT	Tornado Warning	LSX	Greene, Macoupin, Pike	46 min
Jul 12, 4:48 PM CDT	Severe Thunderstorm Warning	LSX	Marion	42 min
Jul 12, 5:10 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	30 min
Jul 12, 5:51 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Marion	39 min
Jul 12, 6:53 PM CDT	Areal Flood Warning	LSX	Marion	4 hr
Jul 12, 1:58 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis	47 min
Jul 12, 2:08 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Shelby	52 min
Jul 12, 2:36 PM CDT	Flash Flood Warning	LSX	Knox	2 hr
Jul 12, 2:54 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Marion, Shelby	51 min
Jul 12, 4:09 PM CDT	Severe Thunderstorm Warning	LSX	Madison	40 min
Jul 12, 4:21 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	42 min
Jul 12, 4:21 PM CDT	Severe Thunderstorm Warning	LSX	Callaway	39 min
Jul 12, 4:45 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Osage	45 min

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.