Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 249, NWS St. Louis, MO

June 9, 2011Knox County, Shelby County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 9, 2011, 3:41 PM CDT for Knox County, Shelby County, Missouri. It was in force for 64 min. 2 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: Jun 9, 2011, 3:41 PM CDT (20:41 UTC)
Expired: Jun 9, 2011, 4:45 PM CDT
In force: 64 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 2.5 in
Wind: 70.0 mph

Counties Knox County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 192 km from the middle of the area, began a volume at 20:43 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
Jun 9, 4:14 PM CDT	HAIL 0.25	Novelty, MO
Jun 9, 4:51 PM CDT	HAIL 0.75	2 N Shelbyville, MO	ON ROUTE 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, 8.7 hours before the alert went out and 232 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: 121 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1420 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: -114 m²/s²
0-3 km storm-relative helicity: -95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

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

483 
WUUS53 KLSX 092041
SVRLSX
MOC103-205-092145-
/O.NEW.KLSX.SV.W.0249.110609T2041Z-110609T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
341 PM CDT THU JUN 9 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 445 PM CDT

* AT 336 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DESTRUCTIVE HAIL UP
  TO TENNIS BALL SIZE...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. 
  THIS STORM WAS LOCATED NEAR LA PLATA...AND MOVING EAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  EDINA...PLEVNA...KNOX CITY...HURDLAND...NOVELTY...LEONARD...BETHEL
  AND NEWARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3983 9196 3987 9230 3995 9229 3995 9234
      3996 9235 4016 9235 4025 9195
TIME...MOT...LOC 2040Z 264DEG 21KT 4000 9245
WIND...HAIL 70MPH 2.50IN

$$

TRUETT

4 follow-up statements

599 
WWUS53 KLSX 092055
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
355 PM CDT THU JUN 9 2011

MOC103-205-092145-
/O.CON.KLSX.SV.W.0249.000000T0000Z-110609T2145Z/
KNOX MO-SHELBY MO-
355 PM CDT THU JUN 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
SHELBY AND KNOX COUNTIES UNTIL 445 PM CDT...

AT 350 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE DESTRUCTIVE
HAIL UP TO TENNIS BALL SIZE...AND DESTRUCTIVE WINDS IN EXCESS OF 70
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 7 MILES
SOUTHEAST OF BRASHEAR TO 9 MILES EAST OF ATLANTA...MOVING EAST AT 25
MPH.

LOCATIONS IMPACTED INCLUDE...
  EDINA...PLEVNA...KNOX CITY...NOVELTY...LEONARD...BETHEL AND NEWARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 3983 9196 3987 9230 3995 9229 3995 9234
      3996 9235 4016 9235 4025 9195
TIME...MOT...LOC 2054Z 264DEG 21KT 4011 9224 3989 9228
WIND...HAIL 70MPH 2.50IN

$$

BRITT

753 
WWUS53 KLSX 092115
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
415 PM CDT THU JUN 9 2011

MOC103-205-092145-
/O.CON.KLSX.SV.W.0249.000000T0000Z-110609T2145Z/
KNOX MO-SHELBY MO-
415 PM CDT THU JUN 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
SHELBY AND KNOX COUNTIES UNTIL 445 PM CDT...

AT 412 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE DESTRUCTIVE
HAIL UP TO TENNIS BALL SIZE...AND DESTRUCTIVE WINDS IN EXCESS OF 70
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES
NORTH OF PLEVNA TO 9 MILES SOUTHWEST OF PLEVNA...MOVING EAST AT 25
MPH.

LOCATIONS IMPACTED INCLUDE...
  PLEVNA...KNOX CITY...NEWARK AND BETHEL.

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.

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3983 9196 3987 9230 3995 9229 3995 9234
      3996 9235 4016 9235 4025 9195
TIME...MOT...LOC 2115Z 266DEG 23KT 4007 9208 3988 9218
WIND...HAIL 70MPH 2.50IN

$$

BRITT

676 
WWUS53 KLSX 092128
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
428 PM CDT THU JUN 9 2011

MOC103-205-092145-
/O.CON.KLSX.SV.W.0249.000000T0000Z-110609T2145Z/
KNOX MO-SHELBY MO-
428 PM CDT THU JUN 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
SHELBY AND SOUTHEASTERN KNOX COUNTIES UNTIL 445 PM CDT...

AT 426 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM PLEVNA TO 6 MILES EAST OF
CLARENCE...MOVING EAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  BETHEL AND NEWARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

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 4010 9196 3983 9196 3987 9230 3995 9229
TIME...MOT...LOC 2128Z 266DEG 23KT 3995 9201 3977 9214
WIND...HAIL 70MPH 1.75IN

$$

BRITT

170 
WWUS53 KLSX 092144
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
444 PM CDT THU JUN 9 2011

MOC103-205-092153-
/O.EXP.KLSX.SV.W.0249.000000T0000Z-110609T2145Z/
KNOX MO-SHELBY MO-
444 PM CDT THU JUN 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SHELBY AND
SOUTHEASTERN KNOX COUNTIES WILL EXPIRE AT 445 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.  A NEW SEVERE THUNDERSTORM WARNING HAS BEEN ISSUED FOR 
EASTERN SHELBY COUNTY UNTIL 515 PM CDT.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT.

LAT...LON 4010 9196 3983 9196 3987 9230 3995 9229
TIME...MOT...LOC 2143Z 266DEG 23KT 3996 9188 3978 9202

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 4:06 PM CDT	Severe Thunderstorm Warning	LSX	Shelby	39 min
Jun 9, 4:36 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion, Shelby	39 min
Jun 9, 5:09 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Monroe, Ralls, Shelby	51 min
Jun 9, 5:54 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	51 min
Jun 9, 6:26 PM CDT	Severe Thunderstorm Warning	LSX	Pike, Ralls	30 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.