Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 112, NWS St. Louis, MO

April 19, 20114 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 2011, 7:29 PM CDT for 4 counties in Missouri. It was in force for 46 min. 1 report 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, 7:29 PM CDT (00:29 UTC)
Expired: Apr 19, 2011, 8:15 PM CDT
In force: 46 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Iron County, MO, Madison County, MO, Saint Francois County, MO, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 113 km from the middle of the area, began a volume at 00:32 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, 7:56 PM CDT	TSTM WND DMG	Farmington, MO	TREES DOWN AT HWY 67 AND 221

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, 1:00 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.5 hours before the alert went out and 310 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: 2409 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 523 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 547 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 24.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

062 
WUUS53 KLSX 200029
SVRLSX
MOC093-123-186-187-200115-
/O.NEW.KLSX.SV.W.0112.110420T0029Z-110420T0115Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN IRON COUNTY IN SOUTHEAST MISSOURI...
  NORTHWESTERN MADISON COUNTY IN SOUTHEAST MISSOURI...
  STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
  ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI...

* UNTIL 815 PM CDT

* AT 727 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PING PONG BALL
  SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM PARK HILLS TO GLOVER...AND
  MOVING EAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BONNE TERRE...DESLOGE...FARMINGTON...ROSELLE...KNOB LICK...ROCKY
  RIDGE...WEINGARTEN...BLOOMSDALE...COFFMAN...WOMAC...DOE RUN...
  LEADINGTON...FRENCH VILLAGE...LIBERTYVILLE...MINE LA MOTTE...RIVER
  AUX VASES AND MINNITH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3740 9072 3789 9062 3809 9020 3779 9002
      3772 9007 3770 9009
TIME...MOT...LOC 0029Z 249DEG 48KT 3784 9052 3751 9058
WIND...HAIL 60MPH 1.50IN

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 7:03 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Washington	42 min
Apr 19, 7:05 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	5 hr
Apr 19, 7:17 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison	28 min
Apr 19, 7:18 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis	42 min
Apr 19, 7:25 PM CDT	Tornado Warning	LSX	Iron, Madison, Saint Francois	40 min
Apr 19, 7:30 PM CDT	Tornado Warning	LSX	Saint Louis, City of Saint Louis	45 min
Apr 19, 7:34 PM CDT	Tornado Warning	LSX	Madison, Sainte Genevieve, Saint Francois	41 min
Apr 19, 7:37 PM CDT	Tornado Warning	LSX	Jefferson, Saint Louis	36 min
Apr 19, 7:39 PM CDT	Tornado Warning	LSX	Franklin, Jefferson, Washington	33 min
Apr 19, 7:48 PM CDT	Tornado Warning	LSX	Madison	27 min
Apr 19, 7:54 PM CDT	Tornado Warning	LSX	Sainte Genevieve	36 min
Apr 19, 9:37 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	21 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.