Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 152, NWS St. Louis, MO

May 11, 2011Marion County, Ralls County, Missouri; Adams County, Brown County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 11, 2011, 2:28 PM CDT for Marion County, Ralls County, Missouri; Adams County, Brown County, Pike County, Illinois. It was in force for 47 min. 5 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, 2:28 PM CDT (19:28 UTC)
Expired: May 11, 2011, 3:15 PM CDT
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Adams County, IL, Brown County, IL, Pike County, IL, Marion County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 120 km from the middle of the area, began a volume at 19:28 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, 2:37 PM CDT	HAIL 1	Hannibal, MO	STILL HAILING.
May 11, 2:44 PM CDT	HAIL 1.75	Hannibal, MO
May 11, 2:47 PM CDT	HAIL 1.25	Barry, IL
May 11, 2:59 PM CDT	HAIL 0.88	Barry, IL
May 11, 3:04 PM CDT	HAIL 0.7	Payson, IL

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, 7.5 hours before the alert went out and 216 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.

409 
WUUS53 KLSX 111928
SVRLSX
ILC001-009-149-MOC127-173-112015-
/O.NEW.KLSX.SV.W.0152.110511T1928Z-110511T2015Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ADAMS COUNTY IN WEST CENTRAL ILLINOIS...
  SOUTHWESTERN BROWN COUNTY IN WEST CENTRAL ILLINOIS...
  NORTHERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...
  SOUTHEASTERN MARION COUNTY IN NORTHEAST MISSOURI...
  NORTHEASTERN RALLS COUNTY IN NORTHEAST MISSOURI...

* UNTIL 315 PM CDT

* AT 224 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 HAS 
  PRODUCED NUMEROUS REPORTS OF 1 TO 2 INCH HAIL. THIS STORM WAS   
  LOCATED 6 MILES WEST OF BARRY...OR 12 MILES EAST OF HANNIBAL...AND   
  MOVING NORTHEAST AT 20 MPH. THIS WARNING REPLACES THE TWO EXISTING
  WARNINGS THAT ARE SET TO EXPIRE AT TWO THIRTY PM.

* LOCATIONS IMPACTED INCLUDE...
  QUINCY...PAYSON...BARRY...BEVERLY...MENDON...PLAINVILLE...ADAMS...
  RICHFIELD...BURTON...BAYLIS...KINGSTON...NEW SALEM...LIBERTY...
  FOWLER...FISHHOOK...COLUMBUS...PALOMA...KELLERVILLE...PERRY AND
  COATSBURG.

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 3979 9061 3959 9117 3960 9121 3953 9133
      3969 9149 4013 9131
TIME...MOT...LOC 1926Z 220DEG 17KT 3971 9114
WIND...HAIL 60MPH 1.50IN

$$

MILLER

2 follow-up statements

142 
WWUS53 KLSX 111948
SVSLSX

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

MOC173-111957-
/O.CAN.KLSX.SV.W.0152.000000T0000Z-110511T2015Z/
RALLS MO-
248 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 4013 9131 3979 9061 3962 9119 3964 9125
      3968 9131 3969 9140 3974 9144
TIME...MOT...LOC 1947Z 220DEG 17KT 3979 9106

$$

ILC001-009-149-MOC127-112015-
/O.CON.KLSX.SV.W.0152.000000T0000Z-110511T2015Z/
PIKE IL-ADAMS IL-BROWN IL-MARION MO-
248 PM CDT WED MAY 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
BROWN...ADAMS AND NORTHERN PIKE COUNTIES IN WEST CENTRAL ILLINOIS...
AND SOUTHEASTERN MARION COUNTY IN NORTHEAST MISSOURI UNTIL 315 PM
CDT...

AT 245 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING GOLF BALL SIZE HAIL IN HANNIBAL.  THERE ARE 
SEVERAL STORMS PRODUCING HAIL WITHIN THE WARNING AREA.  DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BEVERLY...OR 18 MILES
EAST OF HANNIBAL...MOVING NORTHEAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  BEVERLY...MENDON...BAYLIS...KINGSTON...LIBERTY...FOWLER...
  FISHHOOK...COLUMBUS...PALOMA...KELLERVILLE...PERRY AND COATSBURG.

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 4013 9131 3979 9061 3962 9119 3964 9125
      3968 9131 3969 9140 3974 9144
TIME...MOT...LOC 1947Z 220DEG 17KT 3979 9106
WIND...HAIL 60MPH 1.75IN

$$

MILLER

631 
WWUS53 KLSX 112007
SVSLSX

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

MOC127-112018-
/O.CAN.KLSX.SV.W.0152.000000T0000Z-110511T2015Z/
MARION MO-
307 PM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARION COUNTY IS
CANCELLED...

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

LAT...LON 3999 9102 3979 9061 3968 9100 3976 9135
      3980 9137 3982 9140 4000 9130
TIME...MOT...LOC 2008Z 220DEG 17KT 3987 9098

$$

ILC001-009-149-112015-
/O.CON.KLSX.SV.W.0152.000000T0000Z-110511T2015Z/
PIKE IL-ADAMS IL-BROWN IL-
307 PM CDT WED MAY 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
BROWN...SOUTHERN ADAMS AND NORTHERN PIKE COUNTIES IN WEST CENTRAL
ILLINOIS UNTIL 315 PM CDT...

AT 302 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BEVERLY...OR 19 MILES
NORTHWEST OF PITTSFIELD...MOVING NORTHEAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  COLUMBUS...KELLERVILLE AND PERRY.

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 3999 9102 3979 9061 3968 9100 3976 9135
      3980 9137 3982 9140 4000 9130
TIME...MOT...LOC 2008Z 220DEG 17KT 3987 9098
WIND...HAIL 60MPH 1.00IN

$$

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, 2:06 PM CDT	Severe Thunderstorm Warning	LSX	Ralls	24 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, 2:31 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 Illinois, 2011 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.