Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 269, NWS St. Louis, MO

September 6, 2012Franklin County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 6, 2012, 3:39 PM CDT for Franklin County, Missouri. It was in force for 54 min. 6 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: Sep 6, 2012, 3:39 PM CDT (20:39 UTC)
Expired: Sep 6, 2012, 4:33 PM CDT
In force: 54 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Franklin County, MO

The radar

The St Louis radar (KLSX), 35 km from the middle of the area, began a volume at 20:43 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
Sep 6, 3:50 PM CDT	TSTM WND DMG	Union, MO	ESTIMATED 55 MPH WINDS WITH TWO TO THREE INCH DIAMTER TREE LIMBS DOWN.
Sep 6, 3:56 PM CDT	TSTM WND DMG	Villa Ridge, MO	TWELVE INCH DIAMTER TREE LIMB DOWN.
Sep 6, 4:05 PM CDT	TSTM WND GST 49	Washington, MO
Sep 6, 4:06 PM CDT	TSTM WND GST 41	Washington, MO
Sep 6, 4:12 PM CDT	TSTM WND GST 47	Washington, MO
Sep 6, 4:18 PM CDT	TSTM WND DMG	Pacific, MO	SIX TO EIGHT INCH DIAMTER TREE LIMBS DOWN ON SOUTH SIDE OF PACIFIC NEAR HIGHWAY N AND WESTLAKE DRIVE.

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
Sep 6, 12:28 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.7 hours before the alert went out and 276 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: 2016 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 681 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

630 
WUUS53 KLSX 062039
SVRLSX
MOC071-062145-
/O.NEW.KLSX.SV.W.0269.120906T2039Z-120906T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
339 PM CDT THU SEP 6 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 445 PM CDT

* AT 338 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
  LINE EXTENDING FROM 5 MILES NORTHWEST OF BEAUFORT TO SULLIVAN...AND
  MOVING EAST AT 30 MPH.

  HAZARD...60 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
           BROKEN.

* LOCATIONS IMPACTED INCLUDE...
  ST. CLAIR...UNION...WASHINGTON...VILLA RIDGE...GRAY SUMMIT...
  PACIFIC...PARKWAY...LONEDELL...LYON...PINEY PARK...MOSELLE...
  ROBERTSVILLE AND CATAWISSA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3861 9105 3856 9100 3854 9094 3854 9091
      3858 9082 3860 9077 3863 9073 3821 9078
      3821 9112 3844 9115 3845 9137 3855 9137
TIME...MOT...LOC 2039Z 252DEG 26KT 3848 9124 3821 9107

HAIL...<.75IN
WIND...60 MPH

$$

TILLY

2 follow-up statements

072 
WWUS53 KLSX 062120
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
420 PM CDT THU SEP 6 2012

MOC071-062145-
/O.CON.KLSX.SV.W.0269.000000T0000Z-120906T2145Z/
FRANKLIN MO-
420 PM CDT THU SEP 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
FRANKLIN COUNTY UNTIL 445 PM CDT...

AT 418 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM AUGUSTA TO DITTMER...AND MOVING EAST AT 40 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS REPORTED TREE LIMBS DOWN IN VILLA  
         RIDGE WITH THESE STORMS.

IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
         BROKEN.

LOCATIONS IMPACTED INCLUDE...
GRAY SUMMIT...PACIFIC AND CATAWISSA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3831 9098 3844 9115 3845 9120 3857 9124
      3861 9105 3856 9100 3854 9094 3854 9091
      3858 9082 3860 9077 3863 9073 3821 9078
TIME...MOT...LOC 2119Z 252DEG 26KT 3857 9089 3829 9072

HAIL...<.75IN
WIND...60 MPH

$$

KANOFSKY

465 
WWUS53 KLSX 062133
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
433 PM CDT THU SEP 6 2012

MOC071-062143-
/O.CAN.KLSX.SV.W.0269.000000T0000Z-120906T2145Z/
FRANKLIN MO-
433 PM CDT THU SEP 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FRANKLIN COUNTY
IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM CDT.

LAT...LON 3831 9098 3844 9115 3845 9120 3857 9124
      3861 9105 3856 9100 3854 9094 3854 9091
      3858 9082 3860 9077 3863 9073 3821 9078
TIME...MOT...LOC 2133Z 252DEG 26KT 3860 9076 3831 9060

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 1:44 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	46 min
Sep 6, 2:28 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Osage	47 min
Sep 6, 2:31 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	44 min
Sep 6, 3:00 PM CDT	Flash Flood Warning	LSX	Crawford	5 hr
Sep 6, 3:13 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois, Washington	27 min
Sep 6, 3:15 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade	45 min
Sep 6, 3:31 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Washington	44 min
Sep 6, 3:58 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	47 min
Sep 6, 4:02 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, Warren, Washington	43 min
Sep 6, 4:20 PM CDT	Severe Thunderstorm Warning	LSX	Madison	40 min
Sep 6, 4:38 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Louis	37 min
Sep 6, 5:18 PM CDT	Areal Flood Advisory	LSX	Madison, Saint Francois	3 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 2012 Every severe thunderstorm warning in 2012

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.