Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 30, NWS St. Louis, MO

April 9, 2011Marion County, Ralls County, Missouri; Adams County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2011, 3:00 AM CDT for Marion County, Ralls County, Missouri; Adams County, Pike County, Illinois. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 9, 2011, 3:00 AM CDT (08:00 UTC)
Expired: Apr 9, 2011, 3:33 AM CDT
In force: 33 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

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

The radar

The St Louis radar (KLSX), 134 km from the middle of the area, began a volume at 08:03 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.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 8.0 hours before the alert went out and 210 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

897 
WUUS53 KLSX 090800
SVRLSX
ILC001-149-MOC127-173-090845-
/O.NEW.KLSX.SV.W.0030.110409T0800Z-110409T0845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
300 AM CDT SAT APR 9 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 345 AM CDT

* AT 259 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR HANNIBAL...AND MOVING
  NORTHEAST AT 45 MPH. NICKEL SIZE HAIL MAY ALSO ACCOMPANY THESE
  DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  FALL CREEK...PAYSON...BEVERLY...ILASCO...SAVERTON...MARBLEHEAD...
  SEEHORN...HULL...KINDERHOOK...PLAINVILLE...BURTON...ADAMS...
  RICHFIELD...LIBERTY AND KINGSTON.

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 4000 9119 3992 9099 3974 9092 3955 9154
      3971 9162
TIME...MOT...LOC 0800Z 238DEG 40KT 3973 9139
WIND...HAIL 60MPH 0.88IN

$$

TILLY

2 follow-up statements

267 
WWUS53 KLSX 090822
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
322 AM CDT SAT APR 9 2011

MOC127-173-090832-
/O.CAN.KLSX.SV.W.0030.000000T0000Z-110409T0845Z/
RALLS MO-MARION MO-
322 AM CDT SAT APR 9 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 3992 9099 3974 9092 3964 9126 3972 9137
      3976 9138 3979 9137 3982 9139 4000 9119
TIME...MOT...LOC 0822Z 247DEG 43KT 3976 9113

$$

ILC001-149-090845-
/O.CON.KLSX.SV.W.0030.000000T0000Z-110409T0845Z/
PIKE IL-ADAMS IL-
322 AM CDT SAT APR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
ADAMS AND WEST CENTRAL PIKE COUNTIES IN WEST CENTRAL ILLINOIS UNTIL
345 AM CDT...

AT 321 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 7 MILES NORTHWEST OF BARRY...OR 13
MILES EAST OF HANNIBAL...MOVING NORTHEAST AT 50 MPH. NICKEL SIZE HAIL
MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  BEVERLY...RICHFIELD...LIBERTY AND KINGSTON.

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 3992 9099 3974 9092 3964 9126 3972 9137
      3976 9138 3979 9137 3982 9139 4000 9119
TIME...MOT...LOC 0822Z 247DEG 43KT 3976 9113
WIND...HAIL 60MPH 0.88IN

$$

TILLY

197 
WWUS53 KLSX 090833
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
333 AM CDT SAT APR 9 2011

ILC001-149-090843-
/O.CAN.KLSX.SV.W.0030.000000T0000Z-110409T0845Z/
PIKE IL-ADAMS IL-
333 AM CDT SAT APR 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ADAMS AND WEST
CENTRAL PIKE COUNTIES IN WEST CENTRAL ILLINOIS IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 3992 9099 3974 9092 3964 9126 3972 9137
      3976 9138 3979 9137 3982 9139 4000 9119
TIME...MOT...LOC 0833Z 243DEG 40KT 3981 9099

$$

TILLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 1:42 AM CDT	Flash Flood Warning	LSX	Marion, Shelby	6 hr
Apr 9, 2:46 AM CDT	Flash Flood Warning	LSX	Marion	6 hr
Apr 9, 3:44 AM CDT	Severe Thunderstorm Warning	LSX	Pike	31 min
Apr 9, 5:04 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Reynolds, Saint Francois	41 min
Apr 9, 5:08 AM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	22 min
Apr 9, 5:44 AM CDT	Areal Flood Advisory	LSX	Lincoln, Saint Charles, Saint Louis, City of Saint Louis	3 hr
Apr 9, 10:42 AM CDT	River Flood Warning	LSX	Marion	32 days
Apr 9, 4:19 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	26 min
Apr 9, 5:21 AM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	39 min
Apr 9, 5:25 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	35 min
Apr 9, 5:41 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Madison	49 min
Apr 9, 6:43 AM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	32 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.