Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 162, NWS St. Louis, MO

May 28, 2012Gasconade County, Osage County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 28, 2012, 10:20 PM CDT for Gasconade County, Osage County, Missouri. It was in force for 25 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: May 28, 2012, 10:20 PM CDT (03:20 UTC)
Expired: May 28, 2012, 10:45 PM CDT
In force: 25 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Gasconade County, MO, Osage County, MO

The radar

The St Louis radar (KLSX), 88 km from the middle of the area, began a volume at 03:20 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
May 28, 10:52 PM CDT	HAIL 0.75	Bland, MO	HAIL ACCOMPANIED BY ESTIMATED 40 MPH WINDS.

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, 3.3 hours before the alert went out and 253 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: 1923 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1564 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

206 
WUUS53 KLSX 290320
SVRLSX
MOC073-151-290345-
/O.NEW.KLSX.SV.W.0162.120529T0320Z-120529T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1020 PM CDT MON MAY 28 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHEASTERN OSAGE COUNTY IN CENTRAL MISSOURI...

* UNTIL 1045 PM CDT

* AT 1016 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BELLE...AND
  MOVING NORTHEAST 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...
  OWENSVILLE...BLAND...MOUNT STERLING...DRAKE...ROSEBUD AND CANAAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3853 9147 3836 9136 3832 9136 3823 9165
      3828 9165 3829 9188 3834 9191
TIME...MOT...LOC 0320Z 244DEG 23KT 3830 9176

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

$$

CARNEY

1 follow-up statement

390 
WWUS53 KLSX 290342
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1042 PM CDT MON MAY 28 2012

MOC073-151-290352-
/O.EXP.KLSX.SV.W.0162.000000T0000Z-120529T0345Z/
GASCONADE MO-OSAGE MO-
1042 PM CDT MON MAY 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OSAGE AND
GASCONADE COUNTIES WILL EXPIRE AT 1045 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER SMALL HAIL...GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE 
WITH THIS THUNDERSTORM.

LAT...LON 3853 9147 3836 9136 3832 9136 3823 9165
      3828 9165 3829 9188 3834 9191
TIME...MOT...LOC 0342Z 244DEG 23KT 3836 9160

$$

CARNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 8:54 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone	36 min
May 28, 10:47 PM CDT	Severe Thunderstorm Warning	LSX	Gasconade, Osage	28 min
May 29, 12:13 AM CDT	Areal Flood Advisory	LSX	Crawford, Gasconade	7 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.