Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 74, NWS St. Louis, MO

April 19, 20114 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 2011, 4:43 AM CDT for 4 counties in Missouri. It was in force for 47 min. 14 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, 4:43 AM CDT (09:43 UTC)
Expired: Apr 19, 2011, 5:30 AM CDT
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

Counties Franklin County, MO, Gasconade County, MO, Montgomery County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 60 km from the middle of the area, began a volume at 09:43 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, 4:45 AM CDT	HAIL 0.5	Drake, MO	HAIL OCCURRING NOW.
Apr 19, 4:51 AM CDT	HAIL 0.7	2 Nw Hermann, MO
Apr 19, 4:55 AM CDT	HAIL 1	Pershing, MO
Apr 19, 5:01 AM CDT	HAIL 1	2 Nw Hermann, MO
Apr 19, 5:02 AM CDT	HAIL 0.88	4 Se New Haven, MO
Apr 19, 5:03 AM CDT	HAIL 0.5	New Haven, MO
Apr 19, 5:08 AM CDT	HAIL 0.25	Washington, MO	WEST SIDE OF WASHINGTON...JUST STARTED.
Apr 19, 5:10 AM CDT	HAIL 1	7 Se New Haven, MO	NICKEL TO QUARTER SIZE HAIL.
Apr 19, 5:17 AM CDT	HAIL 1	Washington, MO
Apr 19, 5:18 AM CDT	HAIL 1.5	Washington, MO	ALSO INCLUDES GUSTS TO 20 MPH.
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 1	2 W Washington, MO	ON HIGHWAY 100.
Apr 19, 5:34 AM CDT	HAIL 0.88	Dutzow, MO
Apr 19, 5:38 AM CDT	HAIL 1.75	Dutzow, MO

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, 9.7 hours before the alert went out and 288 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.

826 
WUUS53 KLSX 190943
SVRLSX
MOC071-073-139-219-191030-
/O.NEW.KLSX.SV.W.0074.110419T0943Z-110419T1030Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  MONTGOMERY COUNTY IN EAST CENTRAL MISSOURI...
  WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 530 AM CDT

* AT 438 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
  THIS STORM WAS LOCATED 8 MILES EAST OF CHAMOIS...OR 11 MILES WEST
  OF HERMANN...AND MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HERMANN...NEW HAVEN...WARRENTON...UNION...ST. CLAIR...WASHINGTON...
  WRIGHT CITY...DRAKE...BIG SPRING...JONESBURG...BEAUFORT...
  TRELOAR...TRUESDALE...MARTHASVILLE...DUTZOW...AMERICUS...
  RHINELAND...BAY...SWISS AND MCKITTRICK.

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 3883 9165 3887 9105 3887 9097 3833 9098
      3847 9166 3862 9166
TIME...MOT...LOC 0943Z 261DEG 36KT 3870 9157
WIND...HAIL <50MPH 1.50IN

$$

BRITT

2 follow-up statements

519 
WWUS53 KLSX 191003 RRA
SVSLSX

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

MOC071-073-139-219-191030-
/O.CON.KLSX.SV.W.0074.000000T0000Z-110419T1030Z/
FRANKLIN MO-GASCONADE MO-WARREN MO-MONTGOMERY MO-
503 AM CDT TUE APR 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MONTGOMERY...
WARREN...GASCONADE AND NORTHWESTERN FRANKLIN COUNTIES UNTIL 530 AM
CDT...

AT 500 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
THIS STORM WAS LOCATED NEAR HERMANN...MOVING EAST AT 40 MPH.  A 
SECOND SEVERE THUNDERSTORM WAS LOCATED OVER LYON...MOVING NORTHEAST 
AT 40 MPH.  QUARTER SIZE HAIL WAS REPORTED NEAR HERMANN AT 501 AM 
CDT.

LOCATIONS IMPACTED INCLUDE...
  NEW HAVEN...WARRENTON...UNION...WASHINGTON...WRIGHT CITY...ST.
  CLAIR...BEAUFORT...TRELOAR...TRUESDALE...MARTHASVILLE...DUTZOW...
  BERGER...LESLIE...NOSER MILL...LYON AND HOLSTEIN.

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 3883 9165 3887 9105 3887 9097 3833 9098
      3847 9166 3862 9166
TIME...MOT...LOC 1001Z 267DEG 35KT 3869 9135
WIND...HAIL <50MPH 1.50IN

$$

BRITT

516 
WWUS53 KLSX 191027
SVSLSX

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

MOC071-073-139-219-191035-
/O.EXP.KLSX.SV.W.0074.000000T0000Z-110419T1030Z/
FRANKLIN MO-GASCONADE MO-WARREN MO-MONTGOMERY MO-
527 AM CDT TUE APR 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR MONTGOMERY...WARREN...
GASCONADE AND NORTHWESTERN FRANKLIN COUNTIES WILL EXPIRE AT 530 AM
CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF MONTGOMERY AND 
GASCONADE COUNTIES.  A NEW WARNING HAS JUST BEEN ISSUED FOR WARREN 
AND FRANKLIN COUNTIES UNTIL 600 AM CDT.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 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 3883 9165 3887 9105 3887 9097 3833 9098
      3847 9166 3862 9166
TIME...MOT...LOC 1025Z 267DEG 35KT 3870 9105

$$

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, 4:58 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, 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.