Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 283, NWS St. Louis, MO

September 7, 20124 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 7, 2012, 4:18 PM CDT for 4 counties in Missouri. It was in force for 42 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 7, 2012, 4:18 PM CDT (21:18 UTC)
Expired: Sep 7, 2012, 5:00 PM CDT
In force: 42 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Boone County, MO, Callaway County, MO, Cole County, MO, Moniteau County, MO

The radar

The St Louis radar (KLSX), 147 km from the middle of the area, began a volume at 21:19 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 7, 4:33 PM CDT	TSTM WND DMG	Centertown, MO	SEVERAL TREES BLOWN DOWN AROUND TOWN.
Sep 7, 4:41 PM CDT	HAIL 1.75	St. Martins, MO	NICKELS TO GOLF BALLS
Sep 7, 4:45 PM CDT	TSTM WND GST 55	Jefferson City, MO	SOUTHWEST SIDE OF THE CITY NEAR THE FAIR GROUNDS
Sep 7, 4:46 PM CDT	HAIL 0.88	Jefferson City, MO	WEST SIDE OF TOWN
Sep 7, 4:48 PM CDT	HAIL 0.25	Jefferson City, MO	PEA SIZE HAIL AT THE FAIRGROUNDS
Sep 7, 4:52 PM CDT	HAIL 1.75	St. Martins, MO	NICKELS TO GOLF BALLS

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 7, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.3 hours before the alert went out and 235 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: 1095 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 1368 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.9

Open this sounding in Storm Lab

The text

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

825 
WUUS53 KLSX 072118
SVRLSX
MOC019-027-051-135-072200-
/O.NEW.KLSX.SV.W.0283.120907T2118Z-120907T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
418 PM CDT FRI SEP 7 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN BOONE COUNTY IN CENTRAL MISSOURI...
  SOUTHWESTERN CALLAWAY COUNTY IN CENTRAL MISSOURI...
  NORTHERN COLE COUNTY IN CENTRAL MISSOURI...
  NORTHERN MONITEAU COUNTY IN CENTRAL MISSOURI...

* UNTIL 500 PM CDT

* AT 415 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES EAST OF
  BUNCETON...AND MOVING EAST AT 40 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...
  CALIFORNIA...ASHLAND...JEFFERSON CITY...HOLTS SUMMIT...JAMESTOWN...
  MCGIRK...EASLEY...CENTERTOWN...ST. MARTINS...NEW BLOOMFIELD...LAKE
  MYKEE...KLIEVER...LUPUS...SANDY HOOK...WILTON...MARION...
  HARTSBURG...ELSTON...GUTHRIE AND CARRINGTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3869 9276 3869 9262 3876 9259 3888 9253
      3886 9215 3875 9194 3856 9201 3855 9203
      3850 9203 3865 9277
TIME...MOT...LOC 2118Z 279DEG 34KT 3878 9263

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

$$

TRUETT

2 follow-up statements

366 
WWUS53 KLSX 072154
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
454 PM CDT FRI SEP 7 2012

MOC019-135-072203-
/O.CAN.KLSX.SV.W.0283.000000T0000Z-120907T2200Z/
BOONE MO-MONITEAU MO-
454 PM CDT FRI SEP 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MONITEAU AND SOUTHERN
BOONE COUNTIES IS CANCELLED...

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

LAT...LON 3865 9227 3864 9225 3865 9223 3864 9222
      3868 9221 3867 9198 3856 9201 3855 9203
      3850 9203 3859 9234
TIME...MOT...LOC 2153Z 279DEG 34KT 3857 9220

$$

MOC027-051-072200-
/O.CON.KLSX.SV.W.0283.000000T0000Z-120907T2200Z/
CALLAWAY MO-COLE MO-
454 PM CDT FRI SEP 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL COLE
AND SOUTHWESTERN CALLAWAY COUNTIES UNTIL 500 PM CDT...

AT 452 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR JEFFERSON
CITY...AND MOVING EAST AT 40 MPH.

HAZARD...GOLF BALL SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS REPORTING HAIL UP TO THE SIZE OF
GOLF BALLS IN ST MARTINS.  

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

LOCATIONS IMPACTED INCLUDE...
HOLTS SUMMIT...WAINWRIGHT...OSAGE CITY AND SCHUBERT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3865 9227 3864 9225 3865 9223 3864 9222
      3868 9221 3867 9198 3856 9201 3855 9203
      3850 9203 3859 9234
TIME...MOT...LOC 2153Z 279DEG 34KT 3857 9220

HAIL...1.75IN
WIND...60 MPH

$$

TRUETT

429 
WWUS53 KLSX 072201
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
501 PM CDT FRI SEP 7 2012

MOC027-051-072212-
/O.EXP.KLSX.SV.W.0283.000000T0000Z-120907T2200Z/
CALLAWAY MO-COLE MO-
501 PM CDT FRI SEP 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL COLE AND SOUTHWESTERN
CALLAWAY 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 10 PM CDT.

LAT...LON 3865 9227 3864 9225 3865 9223 3864 9222
      3868 9221 3867 9198 3856 9201 3855 9203
      3850 9203 3859 9234
TIME...MOT...LOC 2154Z 279DEG 34KT 3857 9219

$$

TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 3:02 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	43 min
Sep 7, 3:18 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	42 min
Sep 7, 3:33 PM CDT	Severe Thunderstorm Warning	LSX	Boone	57 min
Sep 7, 3:36 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	54 min
Sep 7, 3:51 PM CDT	Severe Thunderstorm Warning	LSX	Washington	39 min
Sep 7, 3:59 PM CDT	Severe Thunderstorm Warning	LSX	Washington	35 min
Sep 7, 4:13 PM CDT	Severe Thunderstorm Warning	LSX	Callaway	62 min
Sep 7, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Iron	51 min
Sep 7, 4:46 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	44 min
Sep 7, 4:50 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	40 min
Sep 7, 5:00 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	45 min
Sep 7, 5:03 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	42 min
Sep 7, 5:13 PM CDT	Tornado Warning	LSX	Iron, Madison, Reynolds	32 min
Sep 7, 5:16 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois	30 min
Sep 7, 5:22 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	23 min
Sep 7, 5:24 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	31 min
Sep 7, 5:25 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Osage	35 min
Sep 7, 5:49 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Warren	41 min
Sep 7, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Washington	40 min
Sep 7, 6:00 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	30 min
Sep 7, 6:03 PM CDT	Areal Flood Advisory	LSX	Iron, Reynolds	6 hr
Sep 7, 6:22 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, Washington	53 min
Sep 7, 6:41 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Iron, Reynolds	49 min

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.