Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 242, NWS St. Louis, MO

August 16, 20124 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 16, 2012, 2:54 PM CDT for 4 counties in Missouri. It was in force for 51 min. 4 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: Aug 16, 2012, 2:54 PM CDT (19:54 UTC)
Expired: Aug 16, 2012, 3:45 PM CDT
In force: 51 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, Washington County, MO

The radar

The St Louis radar (KLSX), 68 km from the middle of the area, began a volume at 19:56 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
Aug 16, 3:23 PM CDT	TSTM WND GST 45	Sullivan, MO
Aug 16, 3:23 PM CDT	HAIL 0.25	Sullivan, MO
Aug 16, 3:26 PM CDT	HAIL 0.5	Bourbon, MO
Aug 16, 3:28 PM CDT	HAIL 0.5	Bourbon, MO	DURATION APPROX. 8 MINUTES

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
Aug 16, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 7.9 hours before the alert went out and 273 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: 1719 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1553 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 106 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.

999 
WUUS53 KLSX 161954
SVRLSX
MOC055-071-073-221-162045-
/O.NEW.KLSX.SV.W.0242.120816T1954Z-120816T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
254 PM CDT THU AUG 16 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CRAWFORD COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHWESTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  NORTHWESTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 345 PM CDT

* AT 252 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 9 MILES SOUTHEAST
  OF OWENSVILLE...AND MOVING EAST AT 25 MPH.

  HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
           DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.

* LOCATIONS IMPACTED INCLUDE...
  BOURBON...SULLIVAN...JAPAN...ST. CLOUD AND STANTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST
LOUIS.

&&

LAT...LON 3830 9092 3808 9096 3818 9164 3838 9160
TIME...MOT...LOC 1954Z 279DEG 21KT 3826 9137

HAIL...1.00IN
WIND...60 MPH

$$

GOSSELIN

2 follow-up statements

792 
WWUS53 KLSX 162037
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
337 PM CDT THU AUG 16 2012

MOC073-162047-
/O.CAN.KLSX.SV.W.0242.000000T0000Z-120816T2045Z/
GASCONADE MO-
337 PM CDT THU AUG 16 2012

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

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

LAT...LON 3815 9138 3823 9137 3823 9136 3834 9137
      3828 9092 3808 9096
TIME...MOT...LOC 2037Z 279DEG 21KT 3822 9105

$$

MOC055-071-221-162045-
/O.CON.KLSX.SV.W.0242.000000T0000Z-120816T2045Z/
CRAWFORD MO-FRANKLIN MO-WASHINGTON MO-
337 PM CDT THU AUG 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
WASHINGTON...SOUTHWESTERN FRANKLIN AND NORTHEASTERN CRAWFORD COUNTIES
UNTIL 345 PM CDT...

AT 334 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 5 MILES EAST OF
SULLIVAN...AND MOVING EAST AT 25 MPH.

HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
         DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME NORTHWESTERN WASHINGTON AND EXTREME
  SOUTHERN FRANKLIN COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST
LOUIS.

&&

LAT...LON 3815 9138 3823 9137 3823 9136 3834 9137
      3828 9092 3808 9096
TIME...MOT...LOC 2037Z 279DEG 21KT 3822 9105

HAIL...1.00IN
WIND...60 MPH

$$

GOSSELIN

130 
WWUS53 KLSX 162045
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
345 PM CDT THU AUG 16 2012

MOC055-071-221-162055-
/O.EXP.KLSX.SV.W.0242.000000T0000Z-120816T2045Z/
CRAWFORD MO-FRANKLIN MO-WASHINGTON MO-
345 PM CDT THU AUG 16 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WASHINGTON...
SOUTHWESTERN FRANKLIN AND NORTHEASTERN CRAWFORD COUNTIES HAS
EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND 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 3815 9138 3823 9137 3823 9136 3834 9137
      3828 9092 3808 9096
TIME...MOT...LOC 2045Z 279DEG 21KT 3821 9099

$$

GOSSELIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 2:07 PM CDT	Severe Thunderstorm Warning	LSX	Gasconade, Osage	23 min
Aug 16, 2:15 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Warren	30 min
Aug 16, 2:37 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	23 min
Aug 16, 2:58 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson	47 min
Aug 16, 3:08 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	52 min
Aug 16, 3:18 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	42 min
Aug 16, 3:28 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	47 min
Aug 16, 3:43 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	47 min
Aug 16, 3:54 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Francois, Washington	33 min
Aug 16, 4:21 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	27 min
Aug 16, 5:26 PM CDT	Areal Flood Advisory	LSX	Crawford, Washington	6 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.