Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 28, NWS St. Louis, MO

April 4, 2011Crawford County, Franklin County, Gasconade County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 4, 2011, 3:28 AM CDT for Crawford County, Franklin County, Gasconade County, Missouri. It was in force for 32 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 4, 2011, 3:28 AM CDT (08:28 UTC)
Expired: Apr 4, 2011, 4:00 AM CDT
In force: 32 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Crawford County, MO, Franklin County, MO, Gasconade County, MO

The radar

The St Louis radar (KLSX), 61 km from the middle of the area, began a volume at 08:30 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 4, 3:53 AM CDT	HAIL 1	Union, MO

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

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 8.5 hours before the alert went out and 280 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: 342 J/kg
Mixed-layer CIN: -476 J/kg
Mixed-layer LCL: 2436 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 457 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.

651 
WUUS53 KLSX 040828
SVRLSX
MOC055-071-073-040900-
/O.NEW.KLSX.SV.W.0028.110404T0828Z-110404T0900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
328 AM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CRAWFORD COUNTY IN EAST CENTRAL MISSOURI...
  FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 400 AM CDT

* AT 326 AM 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 6 MILES
  SOUTH OF OWENSVILLE...AND MOVING NORTHEAST AT 65 MPH.

* LOCATIONS IMPACTED INCLUDE...
  OWENSVILLE...SULLIVAN...ST. CLAIR...UNION...WASHINGTON...ROSEBUD...
  GERALD...BEAUFORT...PARKWAY...LONEDELL...JAPAN...LESLIE...NOSER
  MILL...STANTON...LYON...PINEY PARK AND MOSELLE.

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.

&&

LAT...LON 3834 9165 3860 9105 3859 9104 3823 9077
      3823 9078 3820 9103 3820 9110 3820 9111
      3816 9153
TIME...MOT...LOC 0828Z 246DEG 58KT 3827 9148
WIND...HAIL 60MPH 1.00IN

$$

GLASS

2 follow-up statements

693 
WWUS53 KLSX 040841
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
341 AM CDT MON APR 4 2011

MOC055-073-040850-
/O.CAN.KLSX.SV.W.0028.000000T0000Z-110404T0900Z/
CRAWFORD MO-GASCONADE MO-
341 AM CDT MON APR 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR GASCONADE AND NORTHERN
CRAWFORD COUNTIES IS CANCELLED...

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

LAT...LON 3860 9105 3823 9077 3820 9101 3821 9137
      3846 9137
TIME...MOT...LOC 0840Z 246DEG 58KT 3835 9125

$$

MOC071-040900-
/O.CON.KLSX.SV.W.0028.000000T0000Z-110404T0900Z/
FRANKLIN MO-
341 AM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FRANKLIN
COUNTY UNTIL 400 AM CDT...

AT 339 AM 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
SOUTHEAST OF GERALD...OR 10 MILES NORTHWEST OF SULLIVAN...MOVING
NORTHEAST AT 65 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST. CLAIR...UNION...WASHINGTON...BEAUFORT...PARKWAY...LESLIE...
  NOSER MILL...STANTON...LYON...PINEY PARK AND MOSELLE.

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.

&&

LAT...LON 3860 9105 3823 9077 3820 9101 3821 9137
      3846 9137
TIME...MOT...LOC 0840Z 246DEG 58KT 3835 9125
WIND...HAIL 60MPH 1.00IN

$$

GLASS

152 
WWUS53 KLSX 040901
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
401 AM CDT MON APR 4 2011

MOC071-040911-
/O.EXP.KLSX.SV.W.0028.000000T0000Z-110404T0900Z/
FRANKLIN MO-
401 AM CDT MON APR 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN AND CENTRAL FRANKLIN 
COUNTY HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA AND WAS NOW LOCATED IN NORTHEAST FRANKLIN COUNTY.

LAT...LON 3860 9105 3823 9077 3820 9101 3821 9137
      3846 9137
TIME...MOT...LOC 0841Z 246DEG 58KT 3836 9123

$$

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 8:34 PM CDT	Severe Thunderstorm Warning	LSX	Knox	40 min
Apr 3, 9:30 PM CDT	Severe Thunderstorm Warning	LSX	Lewis	30 min
Apr 3, 9:33 PM CDT	Severe Thunderstorm Warning	LSX	Lewis	24 min
Apr 3, 11:14 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Lewis, Marion, Monroe, Pike and 2 more	46 min
Apr 3, 11:21 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Cole, Moniteau	39 min
Apr 3, 11:54 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Cole, Montgomery, Osage	35 min
Apr 4, 12:25 AM CDT	Severe Thunderstorm Warning	LSX	Boone, Cole, Moniteau	30 min
Apr 4, 3:55 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis	35 min
Apr 4, 3:58 PM CDT	Freeze Warning	LSX	Boone, Callaway, Cole, Crawford, Franklin, Gasconade and 12 more	16 hr

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.