Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 340, NWS St. Louis, MO

June 18, 20114 counties in Illinois; Saint Charles County, Saint Louis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 18, 2011, 6:09 AM CDT for 4 counties in Illinois; Saint Charles County, Saint Louis County, Missouri. It was in force for 51 min. 1 report 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 18, 2011, 6:09 AM CDT (11:09 UTC)
Expired: Jun 18, 2011, 7:00 AM CDT
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Jersey County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 63 km from the middle of the area, began a volume at 11:11 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 18, 6:40 AM CDT	HAIL 0.25	Maryville, 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
Jun 18, 2:44 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 11.2 hours before the alert went out and 187 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: 601 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

788 
WUUS53 KLSX 181109
SVRLSX
ILC083-117-119-135-MOC183-189-181200-
/O.NEW.KLSX.SV.W.0340.110618T1109Z-110618T1200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
609 AM CDT SAT JUN 18 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
  MADISON COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHWESTERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 700 AM CDT

* AT 606 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR WEST ALTON...OR 6 MILES
  NORTH OF BLACK JACK...AND MOVING EAST AT 60 MPH. PENNY SIZE HAIL
  MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

  AT 600 AM CDT...A 60 MPH WIND GUST WAS MEASURED AT SMART FIELD
  NORTH OF ST. CHARLES.

* LOCATIONS IMPACTED INCLUDE...
  GODFREY...ALTON...WOOD RIVER...PONTOON BEACH...BETHALTO...GLEN
  CARBON...MARYVILLE...EDWARDSVILLE...TROY...GILLESPIE...STAUNTON...
  HIGHLAND...LITCHFIELD...HARTFORD...BRIGHTON...ROXANA...SHIPMAN...
  DORSEY...BUNKER HILL AND PRAIRIETOWN.

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 3865 8963 3874 9020 3877 9017 3874 9021
      3875 9034 3895 9048 3897 9046 3897 9049
      3926 8966 3900 8963 3888 8964 3887 8961
      3866 8959
TIME...MOT...LOC 1108Z 260DEG 51KT 3888 9023
WIND...HAIL 60MPH 0.75IN

$$

BRITT

3 follow-up statements

185 
WWUS53 KLSX 181134
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
634 AM CDT SAT JUN 18 2011

ILC083-117-119-135-MOC183-189-181200-
/O.CON.KLSX.SV.W.0340.000000T0000Z-110618T1200Z/
JERSEY IL-MACOUPIN IL-MADISON IL-MONTGOMERY IL-ST. CHARLES MO-
ST. LOUIS MO-
634 AM CDT SAT JUN 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
ST. LOUIS...NORTHEASTERN ST. CHARLES...SOUTHWESTERN MONTGOMERY...
MADISON...SOUTHERN MACOUPIN AND SOUTHERN JERSEY COUNTIES UNTIL 700 AM
CDT...

AT 629 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED NEAR ALTON...MOVING EAST AT 30 MPH.
PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  BETHALTO...MARYVILLE...GLEN CARBON...EDWARDSVILLE...TROY...
  STAUNTON...GILLESPIE...HIGHLAND...LITCHFIELD...BRIGHTON...ROXANA...
  DORSEY...SHIPMAN...CARPENTER...PRAIRIETOWN...BUNKER HILL...
  WORDEN...LIVINGSTON...WILSONVILLE AND ALHAMBRA.

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.

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 3865 8963 3874 9020 3877 9017 3874 9021
      3875 9034 3895 9048 3897 9046 3897 9049
      3926 8966 3900 8963 3888 8964 3887 8961
      3866 8959
TIME...MOT...LOC 1134Z 252DEG 26KT 3889 9010
WIND...HAIL 60MPH 0.75IN

$$

BRITT

968 
WWUS53 KLSX 181142
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
642 AM CDT SAT JUN 18 2011

ILC083-MOC183-189-181151-
/O.CAN.KLSX.SV.W.0340.000000T0000Z-110618T1200Z/
JERSEY IL-ST. CHARLES MO-ST. LOUIS MO-
642 AM CDT SAT JUN 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. LOUIS...
NORTHEASTERN ST. CHARLES AND SOUTHERN JERSEY COUNTIES IS CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.  ADDITIONAL STRONG THUNDERSTORMS ARE POSSIBLE AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 AM 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 3865 8965 3873 9013 3880 9013 3881 9012
      3885 9011 3886 9013 3909 9014 3926 8966
      3900 8963 3888 8964 3887 8961 3866 8959
      3866 8960
TIME...MOT...LOC 1141Z 270DEG 26KT 3882 8999

$$

ILC117-119-135-181200-
/O.CON.KLSX.SV.W.0340.000000T0000Z-110618T1200Z/
MACOUPIN IL-MADISON IL-MONTGOMERY IL-
642 AM CDT SAT JUN 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
MONTGOMERY...MADISON AND SOUTHERN MACOUPIN COUNTIES UNTIL 700 AM
CDT...

AT 638 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED NEAR ROXANA...OR NEAR EDWARDSVILLE...
MOVING EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  GLEN CARBON...EDWARDSVILLE...MARYVILLE...TROY...GILLESPIE...
  HIGHLAND...STAUNTON...LITCHFIELD...BUNKER HILL...PRAIRIETOWN...
  CARPENTER...WILSONVILLE...WORDEN...MARINE...ALHAMBRA...ST. JACOB...
  LIVINGSTON...MOUNT OLIVE...BENLD AND ROYAL LAKES.

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.

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 3865 8965 3873 9013 3880 9013 3881 9012
      3885 9011 3886 9013 3909 9014 3926 8966
      3900 8963 3888 8964 3887 8961 3866 8959
      3866 8960
TIME...MOT...LOC 1141Z 270DEG 26KT 3882 8999
WIND...HAIL 60MPH <.75IN

$$

BRITT

969 
WWUS53 KLSX 181156 RRA
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
656 AM CDT SAT JUN 18 2011

ILC117-119-135-181205-
/O.EXP.KLSX.SV.W.0340.000000T0000Z-110618T1200Z/
MACOUPIN IL-MADISON IL-MONTGOMERY IL-
656 AM CDT SAT JUN 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MONTGOMERY...
MADISON AND SOUTHERN MACOUPIN COUNTIES WILL EXPIRE AT 700 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.  A SEVERE THUNDERSTORM WARNING HAS BEEN REISSUED FOR 
SOUTHEASTERN MADISON COUNTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 AM CDT.

LAT...LON 3865 8965 3873 9013 3880 9013 3881 9012
      3885 9011 3886 9013 3909 9014 3926 8966
      3900 8963 3888 8964 3887 8961 3866 8959
      3866 8960
TIME...MOT...LOC 1155Z 270DEG 26KT 3882 8986

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 12:30 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	45 min
Jun 18, 1:14 AM CDT	Flash Flood Warning	LSX	Macoupin, Montgomery	12 hr
Jun 18, 1:16 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	29 min
Jun 18, 2:51 AM CDT	Flash Flood Warning	LSX	Fayette, Montgomery	6 hr
Jun 18, 4:31 AM CDT	Flash Flood Warning	LSX	Bond, Fayette	6 hr
Jun 18, 5:01 AM CDT	Flash Flood Warning	LSX	Clinton, Marion	6 hr
Jun 18, 5:10 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Calhoun, Greene, Pike	65 min
Jun 18, 5:18 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Madison, Monroe, Saint Clair	57 min
Jun 18, 5:30 AM CDT	Tornado Warning	LSX	Calhoun, Greene, Jersey, Madison, Pike	19 min
Jun 18, 6:20 AM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Monroe, Randolph, Saint Clair, Washington	40 min
Jun 18, 6:21 AM CDT	Tornado Warning	LSX	Clinton, Monroe, Randolph, Saint Clair, Washington	39 min
Jun 18, 6:51 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Madison, Marion, Randolph and 2 more	54 min
Jun 18, 7:24 AM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion	30 min
Jun 18, 1:06 PM CDT	Areal Flood Warning	LSX	Macoupin, Montgomery	4 hr
Jun 18, 3:57 PM CDT	Flash Flood Watch	LSX	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	15 hr
Jun 18, 4:49 PM CDT	River Flood Warning	LSX	Fayette	5 days
Jun 18, 5:01 PM CDT	Areal Flood Warning	LSX	Macoupin, Montgomery	23 hr
Jun 18, 3:12 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau, Osage	63 min
Jun 18, 4:00 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Cole, Gasconade, Montgomery, Osage	45 min
Jun 18, 4:30 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Franklin, Gasconade, Lincoln, Montgomery and 4 more	60 min
Jun 18, 4:56 AM CDT	Tornado Warning	LSX	Lincoln, Montgomery, Saint Charles, Warren	49 min
Jun 18, 5:07 AM CDT	Tornado Warning	LSX	Lincoln, Montgomery, Pike	38 min
Jun 18, 5:50 AM CDT	Areal Flood Advisory	LSX	Saint Charles, Saint Louis, City of Saint Louis	3 hr
Jun 18, 7:28 AM CDT	Severe Thunderstorm Warning	LSX	Madison	16 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.