Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 45, NWS St. Louis, MO

April 10, 20114 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 10, 2011, 10:16 PM CDT for 4 counties in Missouri. It was in force for 44 min. 1 report 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, 10:16 PM CDT (03:16 UTC)
Expired: Apr 10, 2011, 11:00 PM CDT
In force: 44 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Franklin County, MO, Gasconade County, MO, Osage County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 67 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.

What was reported inside it

Time	Report	Where	Remark
Apr 10, 10:59 PM CDT	TSTM WND GST 50	New Haven, MO

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

Springfield, MO (KSGF), launched 00:00Z, 3.3 hours before the alert went out and 284 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: 601 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1468 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

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

757 
WUUS53 KLSX 110316
SVRLSX
MOC071-073-151-219-110400-
/O.NEW.KLSX.SV.W.0045.110411T0316Z-110411T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1016 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  EASTERN OSAGE COUNTY IN CENTRAL MISSOURI...
  WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 1100 PM CDT

* AT 1011 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
  RICH FOUNTAIN...OR 6 MILES SOUTHWEST OF LINN...AND MOVING NORTHEAST
  AT 70 MPH.

* LOCATIONS IMPACTED INCLUDE...
  OWENSVILLE...HERMANN...NEW HAVEN...UNION...WASHINGTON...
  WARRENTON...WRIGHT CITY...MOUNT STERLING...DRAKE...ROSEBUD...
  GERALD...BEAUFORT...TRELOAR...MARTHASVILLE...TRUESDALE...DUTZOW...
  MORRISON...GASCONADE...BAY AND SWISS.

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 3869 9160 3868 9155 3871 9144 3875 9142
      3887 9101 3887 9097 3841 9097 3828 9195
      3858 9196
TIME...MOT...LOC 0316Z 245DEG 61KT 3844 9181
WIND...HAIL 60MPH 1.00IN

$$

GLASS

2 follow-up statements

441 
WWUS53 KLSX 110334
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1034 PM CDT SUN APR 10 2011

MOC151-110344-
/O.CAN.KLSX.SV.W.0045.000000T0000Z-110411T0400Z/
OSAGE MO-
1034 PM CDT SUN APR 10 2011

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

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

LAT...LON 3867 9165 3869 9160 3868 9155 3872 9142
      3875 9142 3887 9101 3887 9097 3841 9097
      3832 9165
TIME...MOT...LOC 0334Z 245DEG 61KT 3856 9152

$$

MOC071-073-219-110400-
/O.CON.KLSX.SV.W.0045.000000T0000Z-110411T0400Z/
FRANKLIN MO-GASCONADE MO-WARREN MO-
1034 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WARREN...
GASCONADE AND NORTHWESTERN FRANKLIN COUNTIES 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 7 MILES
NORTHWEST OF DRAKE...OR 11 MILES SOUTHWEST OF HERMANN...MOVING
NORTHEAST AT 70 MPH.

LOCATIONS IMPACTED INCLUDE...
  HERMANN...NEW HAVEN...UNION...WASHINGTON...WARRENTON...WRIGHT
  CITY...GERALD...BEAUFORT...TRELOAR...MARTHASVILLE...TRUESDALE...
  DUTZOW...BAY...SWISS...LESLIE...NOSER MILL...BERGER...LYON AND
  HOLSTEIN.

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 3867 9165 3869 9160 3868 9155 3872 9142
      3875 9142 3887 9101 3887 9097 3841 9097
      3832 9165
TIME...MOT...LOC 0334Z 245DEG 61KT 3856 9152
WIND...HAIL 60MPH 1.00IN

$$

GLASS

732 
WWUS53 KLSX 110349
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1049 PM CDT SUN APR 10 2011

MOC073-110359-
/O.CAN.KLSX.SV.W.0045.000000T0000Z-110411T0400Z/
GASCONADE MO-
1049 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR GASCONADE COUNTY IS
CANCELLED...

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

LAT...LON 3875 9142 3887 9101 3887 9097 3841 9097
      3836 9137 3870 9138 3871 9140
TIME...MOT...LOC 0349Z 245DEG 61KT 3867 9122

$$

MOC071-219-110400-
/O.CON.KLSX.SV.W.0045.000000T0000Z-110411T0400Z/
FRANKLIN MO-WARREN MO-
1049 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WARREN AND
NORTHWESTERN FRANKLIN COUNTIES UNTIL 1100 PM CDT...

AT 1045 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
NORTHWEST OF NEW HAVEN...MOVING NORTHEAST AT 70 MPH.

LOCATIONS IMPACTED INCLUDE...
  UNION...WASHINGTON...WARRENTON...WRIGHT CITY...MARTHASVILLE...
  TRUESDALE...DUTZOW AND HOLSTEIN.

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 3875 9142 3887 9101 3887 9097 3841 9097
      3836 9137 3870 9138 3871 9140
TIME...MOT...LOC 0349Z 245DEG 61KT 3867 9122
WIND...HAIL 60MPH 1.00IN

$$

GLASS

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, 10:12 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Pike, Ralls	34 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.