Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 89, NWS St. Louis, MO

April 15, 2012Callaway County, Montgomery County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 15, 2012, 5:37 PM CDT for Callaway County, Montgomery County, Missouri. It was in force for 23 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 15, 2012, 5:37 PM CDT (22:37 UTC)
Expired
Apr 15, 2012, 6:00 PM CDT
In force
23 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Callaway County, MO, Montgomery County, MO

The radar

The St Louis radar (KLSX), 98 km from the middle of the area, began a volume at 22:39 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

TimeReportWhereRemark
Apr 15, 5:45 PM CDTTSTM WND GST 50Steedman, MOTRAINED SPOTTER IN STEEDMAN ESTIMATES WIND SPEEDS OF 50 MPH. REPORT ESTIMATED FROM RADAR.

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.

IssuedProductOfficeLasted
Apr 15, 4:42 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 10.6 hours before the alert went out and 278 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2012-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2012-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 319 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
31 J/kg
Mixed-layer CIN
-142 J/kg
Mixed-layer LCL
855 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
319 m²/s²
0-3 km storm-relative helicity
381 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.

199 
WUUS53 KLSX 152237
SVRLSX
MOC027-139-152300-
/O.NEW.KLSX.SV.W.0089.120415T2237Z-120415T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
537 PM CDT SUN APR 15 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALLAWAY COUNTY IN CENTRAL MISSOURI...
  MONTGOMERY COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 600 PM CDT

* AT 535 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 8 MILES NORTHWEST
  OF CHAMOIS...AND MOVING NORTHEAST AT 80 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...
  WILLIAMSBURG...SHAMROCK AND REFORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3906 9177 3906 9144 3868 9180 3866 9187
      3864 9189 3872 9205
TIME...MOT...LOC 2238Z 213DEG 69KT 3877 9187

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

$$

TRUETT
2 follow-up statements
437 
WWUS53 KLSX 152252
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
552 PM CDT SUN APR 15 2012

MOC027-139-152300-
/O.CON.KLSX.SV.W.0089.000000T0000Z-120415T2300Z/
CALLAWAY MO-MONTGOMERY MO-
552 PM CDT SUN APR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MONTGOMERY AND
EASTERN CALLAWAY COUNTIES UNTIL 600 PM CDT...

AT 548 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 8 MILES NORTH OF
CHAMOIS...AND MOVING NORTHEAST AT 80 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED...WITH SOME WEAKENING NOTED.  

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

LOCATIONS IMPACTED INCLUDE...
WILLIAMSBURG AND SHAMROCK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT
IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE
TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT
OR SMALL INTERIOR ROOM.

&&

LAT...LON 3906 9177 3906 9144 3868 9180 3887 9193
TIME...MOT...LOC 2252Z 213DEG 69KT 3886 9171

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

$$

TRUETT
357 
WWUS53 KLSX 152300
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
600 PM CDT SUN APR 15 2012

MOC027-139-152310-
/O.EXP.KLSX.SV.W.0089.000000T0000Z-120415T2300Z/
CALLAWAY MO-MONTGOMERY MO-
600 PM CDT SUN APR 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR MONTGOMERY AND EASTERN
CALLAWAY COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 12 MIDNIGHT.  

LAT...LON 3906 9177 3906 9144 3868 9180 3887 9193
TIME...MOT...LOC 2252Z 213DEG 69KT 3886 9171

$$

TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 9:00 PM CDTRiver Flood WarningLSXFranklin3 days
Apr 15, 3:50 AM CDTWind AdvisoryLSXAudrain, Boone, Callaway, Cole, Crawford, Franklin and 18 more17 hr
Apr 15, 4:24 PM CDTSevere Thunderstorm WarningLSXBoone, Cole, Moniteau36 min
Apr 15, 6:47 PM CDTSevere Thunderstorm WarningLSXPike28 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2012Every 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.