Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 151, NWS St. Louis, MO

May 11, 2011Lincoln County, Saint Charles County, Warren County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 11, 2011, 2:24 PM CDT for Lincoln County, Saint Charles County, Warren County, Missouri. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 11, 2011, 2:24 PM CDT (19:24 UTC)
Expired
May 11, 2011, 2:53 PM CDT
In force
29 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Lincoln County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 48 km from the middle of the area, began a volume at 19:24 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.4 hours before the alert went out and 270 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2011-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2360 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2011-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -68 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2360 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
875 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-68 m²/s²
0-3 km storm-relative helicity
-51 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.

659 
WUUS53 KLSX 111924
SVRLSX
MOC113-183-219-112015-
/O.NEW.KLSX.SV.W.0151.110511T1924Z-110511T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
224 PM CDT WED MAY 11 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  WEST CENTRAL ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 315 PM CDT

* AT 220 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR TRELOAR...OR 5 MILES NORTH OF NEW HAVEN...AND MOVING
  NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WARRENTON...WRIGHT CITY...TRUESDALE...HAWK POINT...FORISTELL AND
  FLINT HILL.

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 3885 9129 3885 9126 3890 9127 3910 9119
      3886 9081 3860 9115 3866 9125 3871 9131
      3871 9134
TIME...MOT...LOC 1924Z 217DEG 16KT 3869 9119
WIND...HAIL 60MPH 1.50IN

$$

MILLER
1 follow-up statement
970 
WWUS53 KLSX 111953
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
253 PM CDT WED MAY 11 2011

MOC113-183-219-112004-
/O.CAN.KLSX.SV.W.0151.000000T0000Z-110511T2015Z/
LINCOLN MO-ST. CHARLES MO-WARREN MO-
253 PM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR WARREN...WEST CENTRAL ST.
CHARLES AND SOUTHWESTERN LINCOLN COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 3885 9129 3885 9126 3890 9127 3910 9119
      3886 9081 3860 9115 3866 9125 3871 9131
      3871 9134
TIME...MOT...LOC 1954Z 217DEG 16KT 3880 9109

$$

MILLER

The office that day

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

IssuedProductOfficeCountiesLasted
May 11, 11:37 AM CDTSevere Thunderstorm WarningLSXKnox, Shelby38 min
May 11, 12:15 PM CDTSevere Thunderstorm WarningLSXKnox12 min
May 11, 2:05 PM CDTSevere Thunderstorm WarningLSXLincoln25 min
May 11, 2:06 PM CDTSevere Thunderstorm WarningLSXRalls24 min
May 11, 2:07 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles38 min
May 11, 2:28 PM CDTSevere Thunderstorm WarningLSXMarion, Ralls47 min
May 11, 2:31 PM CDTSevere Thunderstorm WarningLSXLincoln, Pike44 min
May 11, 4:15 PM CDTAreal Flood AdvisoryLSXMarion, Ralls4 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.