Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 145, NWS St. Louis, MO

May 11, 2011Knox County, Shelby County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 11, 2011, 11:37 AM CDT for Knox County, Shelby County, Missouri. It was in force for 38 min. 3 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
May 11, 2011, 11:37 AM CDT (16:37 UTC)
Expired
May 11, 2011, 12:15 PM CDT
In force
38 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Knox County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 201 km from the middle of the area, began a volume at 16:40 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

TimeReportWhereRemark
May 11, 12:00 PM CDTTSTM WND GST 692 E Novelty, MOMEASURED AT A UNIVERSITY OF MISSOURI AG WEATHER SITE
May 11, 12:05 PM CDTHAIL 0.755 S Edina, MOEST WIND GUST OF 40 MPH
May 11, 12:10 PM CDTTSTM WND DMG6 S Edina, MOLARGE TREE BRANCH DOWN BLOCKING PART OF HIGHWAY F...AROUND 2 MILES WEST OF HIGHWAY 15

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 4.6 hours before the alert went out and 224 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, Davenport, at 12:00Z on 2011-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2842 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, Davenport, at 12:00Z on 2011-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 square meters per square second.193958Sfc1 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
2842 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
931 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.6

Open this sounding in Storm Lab

The text

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

482 
WUUS53 KLSX 111637
SVRLSX
MOC103-205-111715-
/O.NEW.KLSX.SV.W.0145.110511T1637Z-110511T1715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1137 AM CDT WED MAY 11 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KNOX COUNTY IN NORTHEAST MISSOURI...
  NORTHWESTERN SHELBY COUNTY IN NORTHEAST MISSOURI...

* UNTIL 1215 PM CDT

* AT 1134 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES
  NORTHWEST OF CLARENCE...OR 11 MILES NORTHEAST OF MACON...AND MOVING
  NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  EDINA...PLEVNA...KNOX CITY...COLONY...GREENSBURG...LEONARD...
  NOVELTY...HURDLAND AND BARING.

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 4030 9196 4003 9195 3978 9228 3979 9230
      3995 9229 3996 9235 4022 9235 4031 9233
TIME...MOT...LOC 1637Z 207DEG 27KT 3987 9231
WIND...HAIL 60MPH 1.00IN

$$

MILLER
2 follow-up statements
705 
WWUS53 KLSX 111654
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1154 AM CDT WED MAY 11 2011

MOC205-111704-
/O.CAN.KLSX.SV.W.0145.000000T0000Z-110511T1715Z/
SHELBY MO-
1154 AM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SHELBY COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA.

LAT...LON 4030 9196 4003 9196 3996 9218 3995 9231
      3996 9235 4023 9235 4030 9233
TIME...MOT...LOC 1654Z 207DEG 27KT 3998 9223

$$

MOC103-111715-
/O.CON.KLSX.SV.W.0145.000000T0000Z-110511T1715Z/
KNOX MO-
1154 AM CDT WED MAY 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR KNOX COUNTY
UNTIL 1215 PM CDT...

AT 1153 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES
WEST OF PLEVNA...OR 14 MILES SOUTH OF EDINA...MOVING NORTHEAST AT 30
MPH.

LOCATIONS IMPACTED INCLUDE...
  EDINA...KNOX CITY...COLONY...NOVELTY...HURDLAND AND BARING.

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 4030 9196 4003 9196 3996 9218 3995 9231
      3996 9235 4023 9235 4030 9233
TIME...MOT...LOC 1654Z 207DEG 27KT 3998 9223
WIND...HAIL 60MPH 1.00IN

$$

MILLER
169 
WWUS53 KLSX 111709
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1209 PM CDT WED MAY 11 2011

MOC103-111715-
/O.CON.KLSX.SV.W.0145.000000T0000Z-110511T1715Z/
KNOX MO-
1209 PM CDT WED MAY 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR KNOX COUNTY
UNTIL 1215 PM CDT...

AT 1205 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND 
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM PRODUCED A 69 MPH 
WIND GUST AT THE MISSOURI AG SITE 1 MILE EAST OF NOVELTY AT 12 PM. 
THIS STORM WAS LOCATED 7 MILES SOUTH OF EDINA...MOVING NORTHEAST AT 
35 MPH.

LOCATIONS IMPACTED INCLUDE...
  EDINA...KNOX CITY...COLONY AND BARING.

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 4030 9196 4007 9196 4001 9218 4009 9235
      4025 9235 4030 9233
TIME...MOT...LOC 1708Z 216DEG 30KT 4009 9212
WIND...HAIL 70MPH 1.00IN

$$

MILLER

The office that day

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

IssuedProductOfficeCountiesLasted
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, 2:24 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles, Warren29 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.