Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 44, NWS St. Louis, MO

April 10, 2011Audrain County, Pike County, Ralls County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 10, 2011, 10:12 PM CDT for Audrain County, Pike County, Ralls County, Missouri. It was in force for 34 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 10, 2011, 10:12 PM CDT (03:12 UTC)
Expired: Apr 10, 2011, 10:46 PM CDT
In force: 34 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Audrain County, MO, Pike County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 111 km from the middle of the area, began a volume at 03:16 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 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, 3.2 hours before the alert went out and 272 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.

452 
WUUS53 KLSX 110312
SVRLSX
MOC007-163-173-110400-
/O.NEW.KLSX.SV.W.0044.110411T0312Z-110411T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1012 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN AUDRAIN COUNTY IN CENTRAL MISSOURI...
  NORTHWESTERN PIKE COUNTY IN NORTHEAST MISSOURI...
  SOUTHERN RALLS COUNTY IN NORTHEAST MISSOURI...

* UNTIL 1100 PM CDT

* AT 1007 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
  MEXICO...AND MOVING NORTHEAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  VANDALIA...BOWLING GREEN...LADDONIA...FARBER...CURRYVILLE...
  SPENCERBURG...FRANKFORD AND RUSH HILL.

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 3934 9183 3934 9173 3940 9172 3962 9128
      3935 9111 3907 9188 3925 9201
TIME...MOT...LOC 0312Z 239DEG 49KT 3924 9181
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

2 follow-up statements

299 
WWUS53 KLSX 110337
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1037 PM CDT SUN APR 10 2011

MOC007-110347-
/O.CAN.KLSX.SV.W.0044.000000T0000Z-110411T0400Z/
AUDRAIN MO-
1037 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN AUDRAIN COUNTY IS
CANCELLED...

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

LAT...LON 3935 9111 3924 9143 3925 9144 3932 9144
      3932 9152 3933 9156 3950 9153 3962 9128
TIME...MOT...LOC 0337Z 239DEG 49KT 3941 9143

$$

MOC163-173-110400-
/O.CON.KLSX.SV.W.0044.000000T0000Z-110411T0400Z/
PIKE MO-RALLS MO-
1037 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
RALLS AND NORTHWESTERN PIKE COUNTIES IN NORTHEAST MISSOURI UNTIL 1100
PM CDT...

AT 1033 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
NORTH OF VANDALIA...MOVING NORTHEAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  BOWLING GREEN...CURRYVILLE...SPENCERBURG AND FRANKFORD.

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 3935 9111 3924 9143 3925 9144 3932 9144
      3932 9152 3933 9156 3950 9153 3962 9128
TIME...MOT...LOC 0337Z 239DEG 49KT 3941 9143
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

882 
WWUS53 KLSX 110346
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1046 PM CDT SUN APR 10 2011

MOC163-173-110355-
/O.CAN.KLSX.SV.W.0044.000000T0000Z-110411T0400Z/
PIKE MO-RALLS MO-
1046 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN RALLS AND
NORTHWESTERN PIKE COUNTIES IN NORTHEAST MISSOURI IS CANCELLED...

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

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1 AM.

LAT...LON 3935 9111 3924 9143 3925 9144 3932 9144
      3932 9152 3933 9156 3950 9153 3962 9128
TIME...MOT...LOC 0345Z 239DEG 49KT 3946 9131

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 8:33 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	42 min
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, 10:16 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

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.