Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 124, NWS St. Louis, MO

April 22, 2011Saint Louis County, City of Saint Louis, Missouri; 7 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 22, 2011, 10:56 AM CDT for Saint Louis County, City of Saint Louis, Missouri; 7 counties in Illinois. It was in force for 49 min. 9 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: Apr 22, 2011, 10:56 AM CDT (15:56 UTC)
Expired: Apr 22, 2011, 11:45 AM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bond County, IL, Clinton County, IL, Fayette County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL, Saint Clair County, IL, City of Saint Louis, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 89 km from the middle of the area, began a volume at 15:55 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
Apr 22, 11:03 AM CDT	HAIL 0.7	Wood River, IL
Apr 22, 11:09 AM CDT	HAIL 0.75	Granite City, IL
Apr 22, 11:11 AM CDT	HAIL 1	1 E Granite City, IL
Apr 22, 11:15 AM CDT	HAIL 1	Granite City, IL	QUARTER SIZE AND SLIGHTLY LARGER
Apr 22, 11:15 AM CDT	HAIL 1.5	Edwardsville, IL	HAIL OBSERVED AT SIU
Apr 22, 11:19 AM CDT	HAIL 0.25	Edwardsville, IL	HAIL OBSERVED AT SIU
Apr 22, 11:22 AM CDT	HAIL 1	Litchfield, IL
Apr 22, 11:38 AM CDT	HAIL 0.88	St. Louis, MO
Apr 22, 11:45 AM CDT	HAIL 0.5	St. Louis, MO

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, 3.9 hours before the alert went out and 160 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 585 m²/s²
0-3 km storm-relative helicity: 683 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.

318 
WUUS53 KLSX 221556
SVRLSX
ILC005-027-051-117-119-135-163-MOC189-510-221645-
/O.NEW.KLSX.SV.W.0124.110422T1556Z-110422T1645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1056 AM CDT FRI APR 22 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BOND COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTHWESTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTHWESTERN FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...
  EASTERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
  MADISON COUNTY IN SOUTHWEST ILLINOIS...
  MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 1145 AM CDT

* AT 1051 AM 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 GIRARD TO CLAYTON...AND MOVING
  EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  VENICE...CAHOKIA...GRANITE CITY...MADISON...GILLESPIE...EAST ST.
  LOUIS...CENTREVILLE...PONTOON BEACH...WASHINGTON PARK...
  EDWARDSVILLE...GLEN CARBON...STAUNTON...CASEYVILLE...LITCHFIELD...
  MARYVILLE...COLLINSVILLE...FAIRVIEW HEIGHTS...TROY...O'FALLON AND
  HILLSBORO.

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 3856 8947 3856 9041 3884 9023 3882 9014
      3880 9012 3884 9012 3889 9020 3954 8976
      3953 8954 3936 8953 3936 8914 3922 8914
      3922 8900
TIME...MOT...LOC 1556Z 270DEG 42KT 3941 8970 3864 9023
WIND...HAIL 60MPH 1.00IN

$$

BRITT

3 follow-up statements

514 
WWUS53 KLSX 221616
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1116 AM CDT FRI APR 22 2011

MOC189-510-221623-
/O.CAN.KLSX.SV.W.0124.000000T0000Z-110422T1645Z/
ST. LOUIS CITY MO-ST. LOUIS MO-
1116 AM CDT FRI APR 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. LOUIS AND ST.
LOUIS CITY COUNTIES IS CANCELLED...

THE FIRST LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT 
OF THE WARNED AREA.  A SECOND SEVERE THUNDERSTORM WARNING FOR 
ANOTHER LINE OF SEVERE THUNDERSTORMS IS IN EFFECT FOR  SOUTHERN ST. 
LOUIS COUNTY AND ST. LOUIS CITY UNTIL 1145 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 3857 8948 3857 8999 3866 8992 3867 9019
      3870 9019 3878 9015 3882 9011 3884 9012
      3929 8983 3953 8976 3953 8954 3936 8953
      3936 8914 3922 8914 3922 8900
TIME...MOT...LOC 1613Z 270DEG 42KT 3949 8948 3926 8957
          3871 9000

$$

ILC005-027-051-117-119-135-163-221645-
/O.CON.KLSX.SV.W.0124.000000T0000Z-110422T1645Z/
MONTGOMERY IL-ST. CLAIR IL-CLINTON IL-MADISON IL-BOND IL-FAYETTE IL-
MACOUPIN IL-
1116 AM CDT FRI APR 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
MACOUPIN...NORTHWESTERN FAYETTE...BOND...MADISON...NORTHWESTERN
CLINTON...NORTHEASTERN ST. CLAIR AND MONTGOMERY COUNTIES UNTIL 1145
AM CDT...

AT 1108 AM 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.  QUARTER SIZE HAIL 
HAS BEEN REPORTED IN GRANITE CITY WITH THIS LINE OF STORMS.  THESE 
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM WHITE OAK TO 6 MILES 
SOUTHWEST OF RAYMOND TO PONTOON BEACH...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  COLLINSVILLE...MARYVILLE...TROY...O'FALLON...HILLSBORO...LEBANON...
  NOKOMIS...HIGHLAND...GREENVILLE...BREESE...LIVINGSTON...ALHAMBRA...
  MARINE...TAYLOR SPRINGS...SORENTO...WITT...ST. JACOB...RENO...
  COFFEEN AND TRENTON.

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 3857 8948 3857 8999 3866 8992 3867 9019
      3870 9019 3878 9015 3882 9011 3884 9012
      3929 8983 3953 8976 3953 8954 3936 8953
      3936 8914 3922 8914 3922 8900
TIME...MOT...LOC 1613Z 270DEG 42KT 3949 8948 3926 8957
          3871 9000
WIND...HAIL 60MPH 1.00IN

$$

BRITT

790 
WWUS53 KLSX 221632
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1132 AM CDT FRI APR 22 2011

ILC117-163-221639-
/O.CAN.KLSX.SV.W.0124.000000T0000Z-110422T1645Z/
ST. CLAIR IL-MACOUPIN IL-
1132 AM CDT FRI APR 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MACOUPIN AND
NORTHEASTERN ST. CLAIR COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA.  A SEVERE THUNDERSTORM WARNING FOR A SECOND LINE OF 
THUNDERSTORMS REMAINS IN EFFECT FOR NORWESTERN ST. CLAIR COUNTY 
UNTIL 1145 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 3866 8941 3866 8992 3876 8997 3898 8985
      3900 8970 3931 8969 3936 8954 3936 8914
      3922 8914 3922 8900 3921 8900
TIME...MOT...LOC 1629Z 270DEG 42KT 3929 8937 3914 8944
          3874 8980

$$

ILC005-027-051-119-135-221645-
/O.CON.KLSX.SV.W.0124.000000T0000Z-110422T1645Z/
MONTGOMERY IL-CLINTON IL-MADISON IL-BOND IL-FAYETTE IL-
1132 AM CDT FRI APR 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
FAYETTE...BOND...EASTERN MADISON...NORTH CENTRAL CLINTON AND
MONTGOMERY COUNTIES UNTIL 1145 AM CDT...

AT 1125 AM 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 WITT TO TAYLOR SPRINGS TO TROY...
MOVING EAST AT 50 MPH.  WEATHER SPOTTERS HAVE REPORTED QUARTER TO 
PING PONG SIZE HAIL WITH THIS LINE OF STORMS.

LOCATIONS IMPACTED INCLUDE...
  NOKOMIS...HIGHLAND...GREENVILLE...ST. JACOB...WITT...RENO...
  COFFEEN...POCAHONTAS...VAN BURENSBURG...WOBURN...JAMESTOWN...ST.
  ROSE...RAMSEY...MULBERRY GROVE...BEAVER CREEK...SHILOH HILL...
  PANAMA...GRANTFORK...DONNELLSON AND COALTON.

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 3866 8941 3866 8992 3876 8997 3898 8985
      3900 8970 3931 8969 3936 8954 3936 8914
      3922 8914 3922 8900 3921 8900
TIME...MOT...LOC 1629Z 270DEG 42KT 3929 8937 3914 8944
          3874 8980
WIND...HAIL 60MPH 1.00IN

$$

BRITT

470 
WWUS53 KLSX 221648
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1148 AM CDT FRI APR 22 2011

ILC005-027-051-119-135-221654-
/O.EXP.KLSX.SV.W.0124.000000T0000Z-110422T1645Z/
MONTGOMERY IL-CLINTON IL-MADISON IL-BOND IL-FAYETTE IL-
1148 AM CDT FRI APR 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN FAYETTE...BOND...
EASTERN MADISON...NORTH CENTRAL CLINTON AND MONTGOMERY COUNTIES WILL
EXPIRE AT 1145 AM CDT...

THE FIRST LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED 
AND MOVED OUT OF THE WARNED AREA.  THIS LINE OF STORMS STILL MAY 
PRODUCE WIND GUSTS TO 50 MPH AND UP TO NICKEL SIZE HAIL...SO A 
SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR FAYETTE...BOND AND 
SOUTHEASTERN MONTGOMERY COUNTIES UNTIL 1230 PM CDT.

A NEW SEVERE THUNDERSTORM WARNING HAS BEEN ISSUED FOR SOUTHERN 
MADISON AND WESTERN CLINTON COUNTIES UNTIL 1230 PM CDT FOR A SECOND 
LINE OF SEVERE THUNDERSTORMS.

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 3866 8941 3866 8992 3876 8997 3898 8985
      3900 8970 3931 8969 3936 8954 3936 8914
      3922 8914 3922 8900 3921 8900
TIME...MOT...LOC 1644Z 270DEG 42KT 3929 8914 3914 8921
          3874 8958

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 9:24 PM CDT	River Flood Warning	LSX	Gasconade, Montgomery	11 days
Apr 21, 10:14 PM CDT	River Flood Warning	LSX	Reynolds	9 days
Apr 22, 7:12 AM CDT	Areal Flood Advisory	LSX	Sainte Genevieve, Saint Francois	3 hr
Apr 22, 7:17 AM CDT	Areal Flood Advisory	LSX	Jefferson	3 hr
Apr 22, 7:28 AM CDT	Flash Flood Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	6 hr
Apr 22, 8:47 AM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau, Osage	43 min
Apr 22, 9:16 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	44 min
Apr 22, 9:28 AM CDT	Severe Thunderstorm Warning	LSX	Callaway, Lincoln, Montgomery, Pike, Warren	47 min
Apr 22, 9:32 AM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Franklin, Gasconade, Lincoln, Montgomery and 2 more	43 min
Apr 22, 9:36 AM CDT	Flash Flood Warning	LSX	Marion, Monroe, Ralls, Shelby	3 hr
Apr 22, 9:59 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln	46 min
Apr 22, 10:17 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Jefferson, Lincoln, Montgomery, Saint Charles and 2 more	43 min
Apr 22, 11:00 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Jefferson, Saint Charles, Saint Louis, Warren and 2 more	45 min
Apr 22, 11:44 AM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis, City of Saint Louis	46 min
Apr 22, 12:34 PM CDT	River Flood Warning	LSX	Saint Charles	26 hr
Apr 22, 2:39 PM CDT	River Flood Warning	LSX	Marion	37 hr
Apr 22, 4:32 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	43 min
Apr 22, 4:40 PM CDT	Tornado Warning	LSX	Cole, Moniteau	50 min
Apr 22, 5:10 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade	39 min
Apr 22, 5:12 PM CDT	Tornado Warning	LSX	Boone, Callaway, Cole	48 min
Apr 22, 5:49 PM CDT	Tornado Warning	LSX	Callaway, Gasconade, Montgomery, Osage	41 min
Apr 22, 6:05 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	40 min
Apr 22, 6:22 PM CDT	Tornado Warning	LSX	Franklin, Gasconade, Lincoln, Montgomery, Warren	38 min
Apr 22, 6:36 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Osage	39 min
Apr 22, 6:55 PM CDT	Tornado Warning	LSX	Lincoln, Saint Charles, Saint Louis, Warren	50 min
Apr 22, 6:58 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	47 min
Apr 22, 8:51 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	39 min
Apr 22, 11:41 AM CDT	Areal Flood Advisory	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	3 hr
Apr 22, 12:21 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette	39 min
Apr 22, 1:33 PM CDT	River Flood Warning	LSX	Brown	22 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.