Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 149, NWS St. Louis, MO

May 11, 2011Ralls County, Missouri; Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 11, 2011, 2:06 PM CDT for Ralls County, Missouri; Pike County, Illinois. It was in force for 24 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: May 11, 2011, 2:06 PM CDT (19:06 UTC)
Expired: May 11, 2011, 2:30 PM CDT
In force: 24 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Pike County, IL, Ralls County, MO

The radar

The St Louis radar (KLSX), 115 km from the middle of the area, began a volume at 19:07 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
May 11, 2:11 PM CDT	HAIL 1.25	6 E New London, MO	LASTED 5 MINUTES
May 11, 2:19 PM CDT	HAIL 0.88	6 Ese New London, MO	HAIL ACCOMPANIED BY HEAVY RAIN...NEAR 1.00 OF RAIN IN 20 MINUTES.

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, 7.1 hours before the alert went out and 228 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: 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.

713 
WUUS53 KLSX 111906
SVRLSX
ILC149-MOC173-111930-
/O.NEW.KLSX.SV.W.0149.110511T1906Z-110511T1930Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL PIKE COUNTY IN WEST CENTRAL ILLINOIS...
  NORTHEASTERN RALLS COUNTY IN NORTHEAST MISSOURI...

* UNTIL 230 PM CDT

* AT 203 PM 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 5 MILES
  NORTHEAST OF FRANKFORD...OR 12 MILES SOUTHEAST OF HANNIBAL...AND
  MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BARRY...SAVERTON...ILASCO...NEW CANTON...HULL...SEEHORN AND
  KINDERHOOK.

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 3962 9102 3957 9117 3960 9118 3960 9121
      3954 9130 3958 9138 3968 9136 3969 9131
      3972 9136 3976 9135 3976 9091
TIME...MOT...LOC 1906Z 216DEG 24KT 3958 9126
WIND...HAIL 60MPH 1.00IN

$$

MILLER

1 follow-up statement

309 
WWUS53 KLSX 111921
SVSLSX

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

MOC173-111930-
/O.CAN.KLSX.SV.W.0149.000000T0000Z-110511T1930Z/
RALLS MO-
221 PM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN RALLS COUNTY IS
CANCELLED...

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

LAT...LON 3976 9091 3962 9102 3957 9117 3960 9118
      3962 9124 3966 9126 3972 9136 3976 9135
TIME...MOT...LOC 1920Z 216DEG 24KT 3966 9119

$$

ILC149-111930-
/O.CON.KLSX.SV.W.0149.000000T0000Z-110511T1930Z/
PIKE IL-
221 PM CDT WED MAY 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
PIKE COUNTY IN WEST CENTRAL ILLINOIS UNTIL 230 PM CDT...

AT 215 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE 
THUNDERSTORM PRODUCING PING PONG BALL SIZE HAIL.DAMAGING WINDS IN 
EXCESS OF 60 MPH CAN ALSO BE EXPECTED WITH THIS STORM.  THIS STORM 
WAS LOCATED 10 MILES EAST OF NEW LONDON...OR 11 MILES SOUTHEAST OF 
HANNIBAL...MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  BARRY...NEW CANTON...HULL...SEEHORN AND KINDERHOOK.

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 3976 9091 3962 9102 3957 9117 3960 9118
      3962 9124 3966 9126 3972 9136 3976 9135
TIME...MOT...LOC 1920Z 216DEG 24KT 3966 9119
WIND...HAIL 60MPH 1.50IN

$$

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 11:37 AM CDT	Severe Thunderstorm Warning	LSX	Knox, Shelby	38 min
May 11, 12:15 PM CDT	Severe Thunderstorm Warning	LSX	Knox	12 min
May 11, 2:05 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	25 min
May 11, 2:07 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles	38 min
May 11, 2:24 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	29 min
May 11, 2:28 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	47 min
May 11, 2:31 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	44 min
May 11, 4:15 PM CDT	Areal Flood Advisory	LSX	Marion, Ralls	4 hr
May 11, 1:57 PM CDT	Severe Thunderstorm Warning	LSX	Adams	48 min
May 11, 2:42 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey	48 min
May 11, 2:51 PM CDT	Severe Thunderstorm Warning	LSX	Pike	39 min
May 11, 3:15 PM CDT	Severe Thunderstorm Warning	LSX	Brown, Pike	45 min
May 11, 3:30 PM CDT	Severe Thunderstorm Warning	LSX	Pike	15 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2011 Severe Thunderstorm Warnings in Illinois, 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.