Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 39, NWS St. Louis, MO

April 10, 2011Marion County, Ralls County, Missouri; Adams County, Brown County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 10, 2011, 8:33 PM CDT for Marion County, Ralls County, Missouri; Adams County, Brown County, Pike County, Illinois. It was in force for 42 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: Apr 10, 2011, 8:33 PM CDT (01:33 UTC)
Expired: Apr 10, 2011, 9:15 PM CDT
In force: 42 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Lincoln radar (KILX), 126 km from the middle of the area, began a volume at 01:34 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
Apr 10, 8:35 PM CDT	HAIL 1	1 E Hannibal, MO
Apr 10, 8:40 PM CDT	TSTM WND GST 40	Hannibal, MO	NO HAIL IN DOWNTOWN HANNIBAL...HEAVY RAINFALL ESTIMATED WIND GUST TO 40 MPH
Apr 10, 8:40 PM CDT	HAIL 0.88	Hannibal, MO	HAIL OBSERVED ON THE SOUTH SIDE OF HANNIBAL
Apr 10, 9:10 PM CDT	TSTM WND GST 40	New London, MO	WIND GUSTS ESTIMATED BETWEEN 30 AND 40 MPH.
Apr 10, 9:12 PM CDT	TSTM WND DMG	6 Nw Ripley, IL	PUBLIC REPORTED ROOF DAMAGE TO THEIR HOME...REPORT RELAYED BY BROWN COUNTY SHERIFF DEPT. TIME ESTIMATED BY RADAR

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 10, 6:05 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.6 hours before the alert went out and 183 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: 1138 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1662 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

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

052 
WUUS53 KLSX 110133
SVRLSX
ILC001-009-149-MOC127-173-110215-
/O.NEW.KLSX.SV.W.0039.110411T0133Z-110411T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
833 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN ADAMS COUNTY IN WEST CENTRAL ILLINOIS...
  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 915 PM CDT

* AT 832 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 NEAR
  HANNIBAL...AND MOVING NORTHEAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HANNIBAL...FALL CREEK...PAYSON...BARRY...BEVERLY...CAMP POINT...
  CLAYTON...BUCKHORN...GOLDEN...MOUNT STERLING...ILASCO...SAVERTON...
  MARBLEHEAD...SEEHORN...HULL...KINDERHOOK...PLAINVILLE...BURTON...
  ADAMS AND RICHFIELD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH 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.

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 4019 9092 4011 9091 4011 9070 4008 9070
      4007 9067 4005 9068 4003 9061 3999 9060
      3999 9051 3991 9054 3988 9058 3984 9058
      3956 9144 3968 9161 4020 9093
TIME...MOT...LOC 0133Z 228DEG 49KT 3967 9141
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

3 follow-up statements

551 
WWUS53 KLSX 110147
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
847 PM CDT SUN APR 10 2011

MOC127-173-110157-
/O.CAN.KLSX.SV.W.0039.000000T0000Z-110411T0215Z/
RALLS MO-MARION MO-
847 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARION AND
NORTHEASTERN RALLS COUNTIES IS CANCELLED...

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

LAT...LON 4011 9091 4011 9070 4008 9070 4007 9067
      4005 9068 4003 9061 3999 9060 3999 9051
      3991 9054 3988 9058 3984 9058 3963 9122
      3974 9135 3977 9138 3980 9138 3983 9141
      4020 9093
TIME...MOT...LOC 0147Z 228DEG 49KT 3980 9122

$$

ILC001-009-149-110215-
/O.CON.KLSX.SV.W.0039.000000T0000Z-110411T0215Z/
PIKE IL-BROWN IL-ADAMS IL-
847 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
ADAMS...BROWN AND NORTHERN PIKE COUNTIES IN WEST CENTRAL ILLINOIS
UNTIL 915 PM CDT...

AT 846 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 NEAR
PAYSON...OR 10 MILES NORTHEAST OF HANNIBAL...MOVING NORTHEAST AT 55
MPH.

LOCATIONS IMPACTED INCLUDE...
  BARRY...BEVERLY...CAMP POINT...CLAYTON...BUCKHORN...GOLDEN...MOUNT
  STERLING...PLAINVILLE...BURTON...ADAMS...RICHFIELD...LIBERTY...
  KINGSTON...COLUMBUS...FISHHOOK...KELLERVILLE...CHAMBERSBURG...MOUND
  STATION...RIPLEY AND COOPERTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH 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.

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 4011 9091 4011 9070 4008 9070 4007 9067
      4005 9068 4003 9061 3999 9060 3999 9051
      3991 9054 3988 9058 3984 9058 3963 9122
      3974 9135 3977 9138 3980 9138 3983 9141
      4020 9093
TIME...MOT...LOC 0147Z 228DEG 49KT 3980 9122
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

348 
WWUS53 KLSX 110151
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
851 PM CDT SUN APR 10 2011

ILC149-110201-
/O.CAN.KLSX.SV.W.0039.000000T0000Z-110411T0215Z/
PIKE IL-
851 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN PIKE COUNTY IN WEST
CENTRAL ILLINOIS IS CANCELLED...

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

LAT...LON 4011 9091 4011 9070 4008 9070 4007 9067
      4005 9068 4003 9061 3999 9060 3999 9051
      3991 9054 3988 9058 3984 9058 3985 9090
      3985 9092 3979 9093 3977 9105 3977 9137
      3983 9141 4020 9093
TIME...MOT...LOC 0151Z 228DEG 49KT 3983 9116

$$

ILC001-009-110215-
/O.CON.KLSX.SV.W.0039.000000T0000Z-110411T0215Z/
BROWN IL-ADAMS IL-
851 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ADAMS AND
BROWN COUNTIES UNTIL 915 PM CDT...

AT 849 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 NEAR
PAYSON...OR 13 MILES NORTHEAST OF HANNIBAL...MOVING NORTHEAST AT 55
MPH.

LOCATIONS IMPACTED INCLUDE...
  BEVERLY...CAMP POINT...CLAYTON...BUCKHORN...GOLDEN...MOUNT
  STERLING...RICHFIELD...LIBERTY...KINGSTON...COLUMBUS...
  KELLERVILLE...MOUND STATION...VERSAILLES...RIPLEY AND COOPERTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH 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.

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 4011 9091 4011 9070 4008 9070 4007 9067
      4005 9068 4003 9061 3999 9060 3999 9051
      3991 9054 3988 9058 3984 9058 3985 9090
      3985 9092 3979 9093 3977 9105 3977 9137
      3983 9141 4020 9093
TIME...MOT...LOC 0151Z 228DEG 49KT 3983 9116
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

062 
WWUS53 KLSX 110209
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
909 PM CDT SUN APR 10 2011

ILC001-009-110219-
/O.EXP.KLSX.SV.W.0039.000000T0000Z-110411T0215Z/
BROWN IL-ADAMS IL-
909 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ADAMS AND BROWN
COUNTIES WILL EXPIRE AT 915 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY 
ALTHOUGH SMALL HAIL IS STILL POSSIBLE WITH THIS STORM.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1 AM.

LAT...LON 4011 9091 4011 9070 4008 9070 4007 9067
      4005 9068 4003 9061 3999 9060 3999 9051
      3991 9054 3988 9058 3984 9058 3985 9090
      3985 9092 3979 9093 3977 9105 3977 9137
      3983 9141 4020 9093
TIME...MOT...LOC 0209Z 228DEG 49KT 3999 9092

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 8:41 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Moniteau	34 min
Apr 10, 9:06 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Monroe, Ralls	39 min
Apr 10, 9:36 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Monroe, Pike, Ralls	30 min
Apr 10, 9:48 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Pike, Warren	42 min
Apr 10, 10:12 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Pike, Ralls	34 min
Apr 10, 10:16 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Osage, Warren	44 min
Apr 10, 10:57 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Lincoln, Saint Charles, Warren	48 min
Apr 10, 11:38 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade	36 min
Apr 10, 11:35 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin, Madison, Montgomery	40 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.