Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 19, NWS St. Louis, MO

March 4, 20116 counties in Missouri; Calhoun County, Greene County, Jersey County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 4, 2011, 4:39 PM CST for 6 counties in Missouri; Calhoun County, Greene County, Jersey County, Illinois. It was in force for 51 min. 11 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: Mar 4, 2011, 4:39 PM CST (22:39 UTC)
Expired: Mar 4, 2011, 5:30 PM CST
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 80.0 mph

Counties Calhoun County, IL, Greene County, IL, Jersey County, IL, Franklin County, MO, Gasconade County, MO, Lincoln County, MO, Pike County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 22:41 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
Mar 4, 4:43 PM CST	HAIL 0.25	Warrenton, MO	PEA-SIZE HAIL COMPLETELY COVERING THE GROUND.
Mar 4, 4:45 PM CST	HAIL 0.25	1 Ese Truxton, MO	PEA-SIZED HAIL BETWEEN TRUXTON AND HAWK POINT... BUT CLOSER TO TRUXTON.
Mar 4, 5:06 PM CST	HAIL 0.5	6 Ene Marthasville, MO	WIND MEASURED AT 35 MPH
Mar 4, 5:13 PM CST	HAIL 0.25	1 Sw Wentzville, MO	QUARTER-INCH HAIL COVERING THE GROUND ABOUT A QUARTER MILE SOUTH OF I-70 JUST SW OF WENTZVILLE.
Mar 4, 5:15 PM CST	HAIL 0.25	Wentzville, MO	PEA-SIZE HAIL AT THE INTERSECTION OF I-70 AND HIGHWAY 61 40.
Mar 4, 5:15 PM CST	HAIL 0.88	Wentzville, MO
Mar 4, 5:17 PM CST	HAIL 0.25	Hardin, IL
Mar 4, 5:19 PM CST	HAIL 0.25	Lake St. Louis, MO
Mar 4, 5:20 PM CST	HAIL 0.5	1 Wnw O'Fallon, MO
Mar 4, 5:20 PM CST	HAIL 1	New Melle, MO	HAIL BETWEEN THREE QUARTER INCH AND ONE INCH IN DIAMETER.
Mar 4, 5:23 PM CST	HAIL 0.25	O'Fallon, MO	MULTIPLE REPORTS ACROSS WESTERN ST. CHARLES COUNTY

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
Mar 4, 1:33 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.7 hours before the alert went out and 226 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: 1266 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 228 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.

331 
WUUS53 KLSX 042239
SVRLSX
ILC013-061-083-MOC071-073-113-163-183-219-042330-
/O.NEW.KLSX.SV.W.0019.110304T2239Z-110304T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
439 PM CST FRI MAR 4 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  NORTHERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHEASTERN PIKE COUNTY IN NORTHEAST MISSOURI...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 530 PM CST

* AT 437 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 80 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM NEW HARTFORD TO 9 MILES
  NORTHWEST OF DAVIS TO WARRENTON TO 5 MILES NORTHWEST OF TRELOAR TO
  7 MILES NORTHEAST OF DRAKE...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WARRENTON...TROY...WRIGHT CITY...NEW HAVEN...WENTZVILLE...
  ELSBERRY...LAKE ST. LOUIS...ST. PAUL...O'FALLON...DARDENNE
  PRAIRIE...COTTLEVILLE...ST. PETERS...WELDON SPRING...TRUESDALE...
  DAVIS...TRELOAR...EOLIA...MOSCOW MILLS...MARTHASVILLE AND DUTZOW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A
SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

INTENSE SQUALL LINES CAN OCCASIONALLY PRODUCE BRIEF TORNADOES IN
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT
IMMEDIATELY LIKELY...FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 3926 9038 3904 9035 3884 9048 3863 9074
      3852 9124 3851 9152 3867 9135 3887 9123
      3923 9128 3940 9071 3939 9062 3943 9062
      3948 9045
TIME...MOT...LOC 2239Z 256DEG 39KT 3924 9119 3911 9114
          3890 9111 3870 9123 3857 9139
WIND...HAIL 80MPH 1.00IN

$$

CARNEY

1 follow-up statement

091 
WWUS53 KLSX 042313
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
513 PM CST FRI MAR 4 2011

MOC071-073-042322-
/O.CAN.KLSX.SV.W.0019.000000T0000Z-110304T2330Z/
FRANKLIN MO-GASCONADE MO-
513 PM CST FRI MAR 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR GASCONADE AND NORTHWESTERN
FRANKLIN COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.  HOWEVER...A SEVERE THUNDERSTORM WATCH CONTINUES UNTIL 
1000 PM.

LAT...LON 3926 9038 3904 9035 3884 9048 3863 9074
      3862 9107 3895 9106 3933 9094 3940 9071
      3939 9062 3943 9062 3948 9045
TIME...MOT...LOC 2312Z 256DEG 39KT 3935 9075 3914 9066
          3886 9074 3864 9089

$$

ILC013-061-083-MOC113-163-183-219-042330-
/O.CON.KLSX.SV.W.0019.000000T0000Z-110304T2330Z/
JERSEY IL-CALHOUN IL-GREENE IL-ST. CHARLES MO-WARREN MO-LINCOLN MO-
PIKE MO-
513 PM CST FRI MAR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
GREENE...CALHOUN AND WESTERN JERSEY COUNTIES IN SOUTHWEST ILLINOIS...
AND EASTERN LINCOLN...EASTERN WARREN AND ST. CHARLES COUNTIES IN EAST
CENTRAL MISSOURI...AND EAST CENTRAL PIKE COUNTY IN NORTHEAST MISSOURI
UNTIL 530 PM CST...

AT 511 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM BELLEVIEW TO HARDIN TO ST. PAUL
TO AUGUSTA...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST. PAUL...DARDENNE PRAIRIE...O'FALLON...COTTLEVILLE...WELDON
  SPRING...ST. PETERS...HARDIN...DEFIANCE...GRAFTON...CARROLLTON...
  BATCHTOWN...BEECHVILLE...MICHAEL...MEPPEN...KAMPSVILLE...NUTWOOD...
  BRUSSELS...GOLDEN EAGLE...ELDRED AND FIELDON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS IF YOU ARE IN
THE PATH OF THIS STORM. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

INTENSE SQUALL LINES CAN OCCASIONALLY PRODUCE BRIEF TORNADOES IN
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT
IMMEDIATELY LIKELY...FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 3926 9038 3904 9035 3884 9048 3863 9074
      3862 9107 3895 9106 3933 9094 3940 9071
      3939 9062 3943 9062 3948 9045
TIME...MOT...LOC 2312Z 256DEG 39KT 3935 9075 3914 9066
          3886 9074 3864 9089
WIND...HAIL 70MPH 1.00IN

$$

CARNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 4, 2:47 PM CST	Severe Thunderstorm Warning	LSX	Boone	43 min
Mar 4, 3:13 PM CST	Severe Thunderstorm Warning	LSX	Callaway, Cole, Moniteau, Osage	47 min
Mar 4, 3:20 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Boone	40 min
Mar 4, 3:28 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Montgomery	47 min
Mar 4, 3:34 PM CST	Tornado Warning	LSX	Boone, Callaway, Montgomery	41 min
Mar 4, 3:45 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Monroe, Ralls	45 min
Mar 4, 3:49 PM CST	Tornado Warning	LSX	Audrain, Monroe, Pike, Ralls	56 min
Mar 4, 3:59 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Franklin, Gasconade, Lincoln, Montgomery and 3 more	46 min
Mar 4, 4:27 PM CST	Tornado Warning	LSX	Lincoln, Montgomery, Warren	33 min
Mar 4, 4:40 PM CST	Tornado Warning	LSX	Pike	51 min
Mar 4, 5:23 PM CST	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	29 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.