Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 41, NWS St. Louis, MO

April 10, 20115 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 10, 2011, 9:06 PM CDT for 5 counties in Missouri. It was in force for 39 min. 2 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, 9:06 PM CDT (02:06 UTC)
Expired: Apr 10, 2011, 9:45 PM CDT
In force: 39 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Audrain County, MO, Boone County, MO, Callaway County, MO, Monroe County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 129 km from the middle of the area, began a volume at 02:06 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, 9:12 PM CDT	HAIL 0.5	6 Ne Murry, MO
Apr 10, 9:13 PM CDT	HAIL 0.5	Centralia, 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

Davenport, (KDVN), launched 00:00Z, 2.1 hours before the alert went out and 285 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.

670 
WUUS53 KLSX 110206
SVRLSX
MOC007-019-027-137-173-110245-
/O.NEW.KLSX.SV.W.0041.110411T0206Z-110411T0245Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  AUDRAIN COUNTY IN CENTRAL MISSOURI...
  NORTHEASTERN BOONE COUNTY IN CENTRAL MISSOURI...
  NORTHWESTERN CALLAWAY COUNTY IN CENTRAL MISSOURI...
  EASTERN MONROE COUNTY IN NORTHEAST MISSOURI...
  SOUTHWESTERN RALLS COUNTY IN NORTHEAST MISSOURI...

* UNTIL 945 PM CDT

* AT 902 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
  EAST OF COLUMBIA...AND MOVING NORTHEAST AT 65 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CENTRALIA...MEXICO...SANTA FE...VANDALIA...HALLSVILLE...LADDONIA...
  FARBER...PERRY...HATTON...THOMPSON...VANDIVER...RUSH HILL...FLORIDA
  AND STOUTSVILLE.

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 3963 9186 3933 9144 3888 9222 3906 9238
TIME...MOT...LOC 0206Z 229DEG 55KT 3902 9217
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

2 follow-up statements

402 
WWUS53 KLSX 110221
SVSLSX

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

MOC019-027-110231-
/O.CAN.KLSX.SV.W.0041.000000T0000Z-110411T0245Z/
CALLAWAY MO-BOONE MO-
921 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BOONE AND
NORTHWESTERN CALLAWAY COUNTIES IS CANCELLED...

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

LAT...LON 3963 9186 3933 9145 3932 9145 3910 9184
      3912 9211 3924 9210 3931 9215
TIME...MOT...LOC 0221Z 229DEG 55KT 3917 9194

$$

MOC007-137-173-110245-
/O.CON.KLSX.SV.W.0041.000000T0000Z-110411T0245Z/
AUDRAIN MO-MONROE MO-RALLS MO-
921 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
RALLS...EASTERN MONROE AND AUDRAIN COUNTIES UNTIL 945 PM CDT...

AT 920 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...MOVING NORTHEAST AT 65 MPH.

LOCATIONS IMPACTED INCLUDE...
  MEXICO...SANTA FE...VANDALIA...LADDONIA...FARBER...PERRY...
  VANDIVER...RUSH HILL...FLORIDA AND STOUTSVILLE.

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 3963 9186 3933 9145 3932 9145 3910 9184
      3912 9211 3924 9210 3931 9215
TIME...MOT...LOC 0221Z 229DEG 55KT 3917 9194
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

138 
WWUS53 KLSX 110242
SVSLSX

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

MOC007-137-173-110251-
/O.EXP.KLSX.SV.W.0041.000000T0000Z-110411T0245Z/
AUDRAIN MO-MONROE MO-RALLS MO-
942 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN RALLS...EASTERN 
MONROE AND NORTHEASTERN AUDRAIN COUNTIES HAS BEEN REISSUED...

PLEASE REFER TO THAT BULLETIN FOR THE LATEST SEVERE WEATHER
INFORMATION.

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

LAT...LON 3963 9186 3933 9145 3932 9145 3910 9184
      3912 9211 3924 9210 3931 9215
TIME...MOT...LOC 0241Z 229DEG 55KT 3937 9164

$$

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, 9:36 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

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.