Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 77, NWS St. Louis, MO

April 19, 20115 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 2011, 5:23 AM CDT for 5 counties in Missouri. It was in force for 37 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 19, 2011, 5:23 AM CDT (10:23 UTC)
Expired: Apr 19, 2011, 6:00 AM CDT
In force: 37 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Crawford County, MO, Franklin County, MO, Saint Charles County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 42 km from the middle of the area, began a volume at 10:25 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, 5:24 AM CDT	HAIL 0.25	Bourbon, MO
Apr 19, 5:27 AM CDT	HAIL 1	6 W Union, MO	SPOTTER NETWORK....ON HIGHWAY 185 INCLUDES GUSTS TO 20 MPH.
Apr 19, 5:32 AM CDT	HAIL 0.75	Sullivan, MO
Apr 19, 5:32 AM CDT	HAIL 1	2 W Washington, MO	ON HIGHWAY 100.
Apr 19, 5:34 AM CDT	HAIL 0.88	Dutzow, MO
Apr 19, 5:35 AM CDT	HAIL 0.5	Sullivan, MO	STARTED AT 530 AM ENDED AT 535 AM.
Apr 19, 5:38 AM CDT	HAIL 1.75	Dutzow, MO
Apr 19, 5:42 AM CDT	HAIL 0.88	New Melle, MO	PEA TO NICKEL...COVERING THE GROUND.
Apr 19, 5:44 AM CDT	HAIL 0.7	6 Ene Marthasville, MO
Apr 19, 5:50 AM CDT	HAIL 0.75	Washington, MO	LASTED 5 MINUTES.
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.

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, 10.4 hours before the alert went out and 283 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.

273 
WUUS53 KLSX 191023
SVRLSX
MOC055-071-183-219-221-191100-
/O.NEW.KLSX.SV.W.0077.110419T1023Z-110419T1100Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CRAWFORD COUNTY IN EAST CENTRAL MISSOURI...
  FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  WESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  WARREN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHWESTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 600 AM CDT

* AT 521 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 5
  MILES SOUTH OF JONESBURG TO NEW HAVEN TO BOURBON...AND MOVING EAST
  AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SULLIVAN...ANTHONIES MILL...WASHINGTON...WARRENTON...UNION...ST.
  CLAIR...WRIGHT CITY...VILLA RIDGE...GRAY SUMMIT...WENTZVILLE...
  PACIFIC...LAKE ST. LOUIS...MARTHASVILLE...DUTZOW...TRUESDALE...
  PARKWAY...AUGUSTA...NEW MELLE...RICHWOODS AND LONEDELL.

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 3802 9135 3857 9128 3876 9142 3885 9142
      3884 9128 3887 9127 3887 9081 3866 9073
      3830 9076 3823 9078 3819 9077 3804 9078
TIME...MOT...LOC 1023Z 259DEG 41KT 3878 9129 3859 9115
          3813 9121
WIND...HAIL <50MPH 1.75IN

$$

BRITT

1 follow-up statement

026 
WWUS53 KLSX 191036
SVSLSX

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

MOC055-071-183-219-221-191100-
/O.CON.KLSX.SV.W.0077.000000T0000Z-110419T1100Z/
WASHINGTON MO-CRAWFORD MO-FRANKLIN MO-ST. CHARLES MO-WARREN MO-
536 AM CDT TUE APR 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WARREN...
WESTERN ST. CHARLES...FRANKLIN...NORTHEASTERN CRAWFORD AND
NORTHWESTERN WASHINGTON COUNTIES UNTIL 600 AM CDT...

AT 534 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
TRUESDALE TO WASHINGTON TO 7 MILES EAST OF SULLIVAN...MOVING EAST AT 
45 MPH.  AT 518 AM...PING PONG BALL SIZE HAIL WAS REPORTED IN 
WASHINGTON IN FRANKLIN COUNTY.

LOCATIONS IMPACTED INCLUDE...
  WRIGHT CITY...VILLA RIDGE...GRAY SUMMIT...PACIFIC...WENTZVILLE...
  LAKE ST. LOUIS...PARKWAY...AUGUSTA...NEW MELLE...RICHWOODS...
  LONEDELL...DEFIANCE...PINEY PARK...MOSELLE...FORISTELL...MATSON...
  ROBERTSVILLE...CATAWISSA AND FLINT HILL.

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 3802 9135 3857 9128 3876 9142 3885 9142
      3884 9128 3887 9127 3887 9081 3866 9073
      3830 9076 3823 9078 3819 9077 3804 9078
TIME...MOT...LOC 1035Z 259DEG 41KT 3881 9112 3856 9096
          3819 9103
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, 5:43 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, Washington	47 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.