Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 63, NWS St. Louis, MO

April 15, 2011Saint Charles County, Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 15, 2011, 4:43 PM CDT for Saint Charles County, Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois. It was in force for 47 min. 12 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 15, 2011, 4:43 PM CDT (21:43 UTC)
Expired: Apr 15, 2011, 5:30 PM CDT
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 50 km from the middle of the area, began a volume at 21:42 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 15, 4:54 PM CDT	HAIL 1	St. Louis, MO	HAIL IN ST. LOUIS CITY AT BROADWAY AND HWY 55.
Apr 15, 4:56 PM CDT	HAIL 0.25	St. Louis, MO	PEA SIZE HAIL IN TOWER GROVE
Apr 15, 5:03 PM CDT	HAIL 0.25	Godfrey, IL
Apr 15, 5:07 PM CDT	HAIL 0.25	Granite City, IL	PEA SIZE HAIL APPROXIMATELY 2 MILES NORTH OF THE MCKINLEY BRIDGE
Apr 15, 5:09 PM CDT	HAIL 0.25	Granite City, IL
Apr 15, 5:16 PM CDT	HAIL 0.7	Wood River, IL
Apr 15, 5:17 PM CDT	HAIL 1	Wood River, IL
Apr 15, 5:18 PM CDT	HAIL 0.25	Collinsville, IL
Apr 15, 5:24 PM CDT	HAIL 0.25	Collinsville, IL
Apr 15, 5:26 PM CDT	HAIL 0.25	Alton, IL
Apr 15, 5:27 PM CDT	HAIL 0.25	Edwardsville, IL
Apr 15, 5:29 PM CDT	HAIL 0.88	Pontoon Beach, 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
Apr 15, 12:47 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.7 hours before the alert went out and 200 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: 1776 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 129 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.

037 
WUUS53 KLSX 152143
SVRLSX
ILC119-163-MOC183-189-510-152230-
/O.NEW.KLSX.SV.W.0063.110415T2143Z-110415T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
443 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  EXTREME NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 530 PM CDT

* AT 438 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 PORTAGE DES SIOUX TO BLACK JACK
  TO EAST CARONDELET...AND MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CAHOKIA...VENICE...MADISON...EAST ST. LOUIS...GRANITE CITY...
  GODFREY...ALTON...CENTREVILLE...WASHINGTON PARK...WOOD RIVER...
  PONTOON BEACH...SWANSEA...CASEYVILLE...BETHALTO...FAIRVIEW
  HEIGHTS...COLLINSVILLE...SHILOH...GLEN CARBON...EDWARDSVILLE AND
  MARYVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

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 3852 9026 3893 9029 3893 9028 3900 9028
      3900 8972 3856 8972
TIME...MOT...LOC 2143Z 242DEG 30KT 3893 9027 3880 9021
          3857 9021
WIND...HAIL 60MPH 1.00IN

$$

GLASS

1 follow-up statement

897 
WWUS53 KLSX 152227 RRA
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
527 PM CDT FRI APR 15 2011

ILC119-163-MOC183-189-510-152236-
/O.EXP.KLSX.SV.W.0063.000000T0000Z-110415T2230Z/
ST. CLAIR IL-MADISON IL-ST. LOUIS CITY MO-ST. LOUIS MO-ST. CHARLES 
527 PM CDT FRI APR 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. CHARLES...
NORTHEASTERN ST. LOUIS...ST. LOUIS CITY...MADISON AND NORTHERN ST.
CLAIR COUNTIES WILL EXPIRE AT 530 PM CDT...

HOWEVER...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL MADISON 
COUNTY UNTIL 545 PM CDT...

PLEASE SEE THE BULLETIN FOR FURTHER INFORMATION.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 900 PM.

LAT...LON 3852 9026 3893 9029 3893 9028 3900 9028
      3900 8972 3856 8972
TIME...MOT...LOC 2226Z 242DEG 30KT 3910 8986 3897 8980
          3874 8980

$$

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 1:09 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	51 min
Apr 15, 1:53 PM CDT	Severe Thunderstorm Warning	LSX	Pike	35 min
Apr 15, 2:00 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion, Ralls	45 min
Apr 15, 2:20 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Warren	40 min
Apr 15, 2:23 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	22 min
Apr 15, 2:52 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	53 min
Apr 15, 2:54 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Lincoln, Pike, Saint Charles, Saint Louis and 1 more	51 min
Apr 15, 3:32 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	43 min
Apr 15, 3:52 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Francois	38 min
Apr 15, 4:03 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	42 min
Apr 15, 4:21 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	39 min
Apr 15, 4:08 PM CDT	Severe Thunderstorm Warning	LSX	Adams	18 min
Apr 15, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Pike	48 min
Apr 15, 4:13 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	47 min
Apr 15, 4:54 PM CDT	Tornado Warning	LSX	Macoupin	38 min
Apr 15, 4:56 PM CDT	Tornado Warning	LSX	Montgomery	34 min
Apr 15, 5:10 PM CDT	Tornado Warning	LSX	Madison, Saint Clair	35 min
Apr 15, 5:37 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	38 min
Apr 15, 6:05 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	40 min
Apr 15, 6:07 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion	53 min
Apr 15, 6:42 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	28 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2011 Severe Thunderstorm Warnings in Illinois, 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.