Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 78, NWS St. Louis, MO

April 19, 20115 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 2011, 5:43 AM CDT for 5 counties in Missouri. It was in force for 47 min. 25 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 19, 2011, 5:43 AM CDT (10:43 UTC)
Expired: Apr 19, 2011, 6:30 AM CDT
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 2.5 in
Wind: 50.0 mph

Counties Franklin County, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 32 km from the middle of the area, began a volume at 10:42 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 19, 5:44 AM CDT	HAIL 0.7	6 Ene Marthasville, MO
Apr 19, 6:03 AM CDT	HAIL 1	Lonedell, MO
Apr 19, 6:08 AM CDT	HAIL 1.75	2 Ne Richwoods, MO	LASTED 3 MINUTES...FROM 0605 TO 0608 AM.
Apr 19, 6:11 AM CDT	HAIL 0.5	Weldon Spring, MO	AT WFO LSX.
Apr 19, 6:13 AM CDT	HAIL 1.75	4 N Dittmer, MO	LASTED 3 MINUTES FROM 609 TO 612 AM. QUARTER TO GOLF BALL SIZE HAIL.
Apr 19, 6:20 AM CDT	HAIL 0.75	3 Nw Hillsboro, MO
Apr 19, 6:20 AM CDT	HAIL 1	3 Nw Hillsboro, MO
Apr 19, 6:21 AM CDT	HAIL 0.25	Harvester, MO
Apr 19, 6:21 AM CDT	HAIL 1	Chesterfield, MO	AT LADUE AND OLIVE.
Apr 19, 6:23 AM CDT	HAIL 1.75	Hillsboro, MO	STARTED AT 618 AM AND CONTINUES....GROUND COVERED.
Apr 19, 6:24 AM CDT	HAIL 2	1 W Hillsboro, MO	ONE WINDOW WAS BROKEN BY THE HAIL.
Apr 19, 6:27 AM CDT	HAIL 1.75	Hillsboro, MO	AT JEFFERSON COLLEGE.
Apr 19, 6:29 AM CDT	HAIL 1.75	1 N Mapaville, MO
Apr 19, 6:29 AM CDT	HAIL 1.75	Hillsboro, MO
Apr 19, 6:30 AM CDT	HAIL 1	Festus, MO
Apr 19, 6:31 AM CDT	HAIL 0.25	St. Peters, MO	AT WILLIOT AND JODY.
Apr 19, 6:31 AM CDT	HAIL 0.7	Maryland Heights, MO
Apr 19, 6:31 AM CDT	HAIL 1.75	Herculaneum, MO
Apr 19, 6:32 AM CDT	HAIL 2.75	2 Ene Mapaville, MO	UPDATE TO REPORT....2 CARS LOST WINDSHIELDS AT SANDCASTLE OFF HIGHWAY Z.
Apr 19, 6:32 AM CDT	HAIL 2.75	Pevely, MO
Apr 19, 6:35 AM CDT	HAIL 0.25	Overland, MO	PEA SIZED AND SLIGHTLY BIGGER HAIL
Apr 19, 6:36 AM CDT	HAIL 1	Crystal City, MO
Apr 19, 6:38 AM CDT	HAIL 1.75	Herculaneum, MO
Apr 19, 6:39 AM CDT	HAIL 0.25	St. Peters, MO	HAIL COVERING GROUND.
Apr 19, 6:39 AM CDT	HAIL 1	Overland, MO	2 REPORTS OF 1 INCH HAIL FROM THIS AREA

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 19, 3:11 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 10.7 hours before the alert went out and 250 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: 1035 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 347 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.

408 
WUUS53 KLSX 191043
SVRLSX
MOC071-099-183-189-221-191130-
/O.NEW.KLSX.SV.W.0078.110419T1043Z-110419T1130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
543 AM CDT TUE APR 19 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 630 AM CDT

* AT 542 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE DESTRUCTIVE
  HAIL UP TO TENNIS BALL SIZE.  THESE STORMS WERE LOCATED ALONG A
  LINE EXTENDING FROM AUGUSTA TO 8 MILES NORTHEAST OF ANTHONIES
  MILL...AND MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  VILLA RIDGE...GRAY SUMMIT...DARDENNE PRAIRIE...PACIFIC...
  COTTLEVILLE...WELDON SPRING...WILDWOOD...EUREKA...CHESTERFIELD...
  CLARKSON VALLEY...CEDAR HILL...ELLISVILLE...BALLWIN...BYRNES
  MILL...MANCHESTER...HIGH RIDGE...MARYLAND HEIGHTS...HILLSBORO...
  TOWN AND COUNTRY AND VALLEY PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3814 9108 3855 9099 3855 9097 3875 9095
      3882 9016 3877 9017 3867 9031 3858 9032
      3855 9027 3852 9026 3844 9029 3837 9036
      3829 9037 3822 9036 3817 9030 3812 9031
TIME...MOT...LOC 1043Z 265DEG 37KT 3862 9089 3818 9098
WIND...HAIL <50MPH 2.50IN

$$

BRITT

2 follow-up statements

749 
WWUS53 KLSX 191056
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
556 AM CDT TUE APR 19 2011

MOC071-099-183-189-221-191130-
/O.CON.KLSX.SV.W.0078.000000T0000Z-110419T1130Z/
WASHINGTON MO-JEFFERSON MO-FRANKLIN MO-ST. LOUIS MO-ST. CHARLES MO-
556 AM CDT TUE APR 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
ST. CHARLES...ST. LOUIS...EASTERN FRANKLIN...JEFFERSON AND NORTHERN
WASHINGTON COUNTIES UNTIL 630 AM CDT...

AT 552 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PING PONG BALL SIZE
HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM DEFIANCE
TO RICHWOODS...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  COTTLEVILLE...WELDON SPRING...WILDWOOD...EUREKA...ST. PETERS...
  CHESTERFIELD...CLARKSON VALLEY...CEDAR HILL...ELLISVILLE...
  BALLWIN...BYRNES MILL...MANCHESTER...HIGH RIDGE...MARYLAND
  HEIGHTS...HILLSBORO...TOWN AND COUNTRY...VALLEY PARK...DE SOTO...
  MURPHY AND CREVE COEUR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3814 9108 3855 9099 3855 9097 3875 9095
      3882 9016 3877 9017 3867 9031 3858 9032
      3855 9027 3852 9026 3844 9029 3837 9036
      3829 9037 3822 9036 3817 9030 3812 9031
TIME...MOT...LOC 1056Z 265DEG 37KT 3863 9072 3819 9081
WIND...HAIL <50MPH 1.50IN

$$

BRITT

152 
WWUS53 KLSX 191115
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
615 AM CDT TUE APR 19 2011

MOC071-221-191121-
/O.CAN.KLSX.SV.W.0078.000000T0000Z-110419T1130Z/
WASHINGTON MO-FRANKLIN MO-
615 AM CDT TUE APR 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN FRANKLIN AND NORTHERN
WASHINGTON COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.  STRONG STORMS MAY STILL DEVELOP AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM CDT.

LAT...LON 3814 9071 3817 9075 3877 9070 3882 9016
      3877 9017 3867 9031 3858 9032 3855 9027
      3852 9026 3843 9030 3837 9036 3829 9037
      3821 9035 3817 9030 3812 9031
TIME...MOT...LOC 1111Z 259DEG 33KT 3869 9065 3823 9066

$$

MOC099-183-189-191130-
/O.CON.KLSX.SV.W.0078.000000T0000Z-110419T1130Z/
JEFFERSON MO-ST. LOUIS MO-ST. CHARLES MO-
615 AM CDT TUE APR 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL ST.
CHARLES...ST. LOUIS AND JEFFERSON COUNTIES UNTIL 630 AM CDT...

AT 607 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM WELDON 
SPRING TO 8 MILES WEST OF HILLSBORO...MOVING EAST AT 40 MPH.  

AT 608 AM CDT...GOLFBALL SIZE HAIL WAS REPORTED NEAR RICHWOODS.  AT 
THE SAME TIME...HALF INCH DIAMETER HAIL WAS FALLING AT THE NATIONAL 
WEATHER SERVICE OFFICE IN WELDON SPRING.

LOCATIONS IMPACTED INCLUDE...
  EUREKA...CEDAR HILL...WELDON SPRING...COTTLEVILLE...CLARKSON
  VALLEY...DE SOTO...ELLISVILLE...CHESTERFIELD...ST. PETERS...
  HILLSBORO...BYRNES MILL...BALLWIN...HIGH RIDGE...MANCHESTER...
  MURPHY...VALLEY PARK...TOWN AND COUNTRY...MARYLAND HEIGHTS...
  ANTONIA AND FENTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3814 9071 3817 9075 3877 9070 3882 9016
      3877 9017 3867 9031 3858 9032 3855 9027
      3852 9026 3843 9030 3837 9036 3829 9037
      3821 9035 3817 9030 3812 9031
TIME...MOT...LOC 1111Z 259DEG 33KT 3869 9065 3823 9066
WIND...HAIL <50MPH 1.75IN

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 2:51 AM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau, Osage	39 min
Apr 19, 3:19 AM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau, Osage	41 min
Apr 19, 3:26 AM CDT	Severe Thunderstorm Warning	LSX	Callaway, Gasconade, Osage	49 min
Apr 19, 3:39 AM CDT	Severe Thunderstorm Warning	LSX	Moniteau	21 min
Apr 19, 3:57 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Cole, Franklin, Gasconade and 4 more	48 min
Apr 19, 4:35 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	40 min
Apr 19, 4:43 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Montgomery, Warren	47 min
Apr 19, 4:58 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Washington	32 min
Apr 19, 5:23 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Saint Charles, Warren, Washington	37 min
Apr 19, 6:21 AM CDT	Areal Flood Advisory	LSX	Jefferson, Saint Charles, Saint Louis, City of Saint Louis	3 hr
Apr 19, 6:22 AM CDT	Severe Thunderstorm Warning	LSX	Jefferson	38 min
Apr 19, 6:26 AM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	49 min
Apr 19, 7:08 AM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	37 min
Apr 19, 8:05 AM CDT	River Flood Warning	LSX	Saint Charles	30 hr
Apr 19, 11:06 AM CDT	River Flood Warning	LSX	Lincoln	19 days
Apr 19, 11:33 AM CDT	River Flood Warning	LSX	Jefferson, Saint Louis	30 days
Apr 19, 3:46 PM CDT	Severe Thunderstorm Warning	LSX	Pike, Ralls	44 min
Apr 19, 3:48 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Montgomery, Pike	42 min
Apr 19, 3:54 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Osage	51 min
Apr 19, 3:59 PM CDT	Tornado Warning	LSX	Pike	46 min
Apr 19, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Franklin, Gasconade, Osage	51 min
Apr 19, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Montgomery, Warren	44 min
Apr 19, 4:31 PM CDT	Tornado Warning	LSX	Pike	44 min
Apr 19, 4:41 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	49 min
Apr 19, 5:01 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Saint Charles, Warren	44 min
Apr 19, 5:13 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Montgomery, Saint Charles, Warren	47 min
Apr 19, 5:28 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	47 min
Apr 19, 5:44 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	34 min
Apr 19, 5:56 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Warren	34 min
Apr 19, 5:58 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade	32 min
Apr 19, 6:12 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis, Warren	48 min
Apr 19, 6:14 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Warren	31 min
Apr 19, 6:15 PM CDT	Severe Thunderstorm Warning	LSX	Reynolds	60 min
Apr 19, 6:30 PM CDT	Flash Flood Warning	LSX	Saint Charles	3 hr
Apr 19, 6:37 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Reynolds, Saint Francois, Washington	53 min
Apr 19, 6:45 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles	30 min
Apr 19, 6:51 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	39 min
Apr 19, 6:56 PM CDT	Areal Flood Advisory	LSX	Franklin, Warren	5 hr
Apr 19, 6:56 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	64 min

Nearby

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.