Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 114, NWS St. Louis, MO

April 28, 2012Lincoln County, Montgomery County, Warren County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 4:55 PM CDT for Lincoln County, Montgomery County, Warren County, Missouri. It was in force for 50 min. 3 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: Apr 28, 2012, 4:55 PM CDT (21:55 UTC)
Expired: Apr 28, 2012, 5:45 PM CDT
In force: 50 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Lincoln County, MO, Montgomery County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 43 km from the middle of the area, began a volume at 21:56 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
Apr 28, 5:08 PM CDT	HAIL 1.25	2 N Warrenton, MO
Apr 28, 5:17 PM CDT	HAIL 1.75	5 N Wright City, MO	HAIL COVERING GROUND.
Apr 28, 5:20 PM CDT	HAIL 1.75	2 N Wright City, MO

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
Apr 28, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.9 hours before the alert went out and 269 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 681 m²/s²
0-3 km storm-relative helicity: 811 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

772 
WUUS53 KLSX 282155
SVRLSX
MOC113-139-219-282245-
/O.NEW.KLSX.SV.W.0114.120428T2155Z-120428T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
455 PM CDT SAT APR 28 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  MONTGOMERY COUNTY IN EAST CENTRAL MISSOURI...
  WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 545 PM CDT

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

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

* LOCATIONS IMPACTED INCLUDE...
  WARRENTON...WRIGHT CITY...TROY...HAWK POINT...TRELOAR...
  TRUESDALE...MARTHASVILLE...DUTZOW...MOSCOW MILLS...HOLSTEIN AND
  CAVE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3912 9134 3898 9085 3889 9087 3889 9096
      3855 9097 3856 9100 3861 9105 3860 9115
      3862 9122 3865 9123 3871 9131 3870 9137
      3871 9140 3871 9152
TIME...MOT...LOC 2155Z 278DEG 38KT 3883 9123

HAIL...1.00IN
WIND...<50 MPH

$$

KANOFSKY

2 follow-up statements

109 
WWUS53 KLSX 282206
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
506 PM CDT SAT APR 28 2012

MOC139-282216-
/O.CAN.KLSX.SV.W.0114.000000T0000Z-120428T2245Z/
MONTGOMERY MO-
506 PM CDT SAT APR 28 2012

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

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

LAT...LON 3885 9126 3910 9126 3898 9085 3889 9087
      3889 9096 3855 9097 3856 9100 3861 9105
      3860 9115 3862 9122 3865 9123 3871 9131
      3870 9137 3871 9142 3884 9142
TIME...MOT...LOC 2206Z 278DEG 38KT 3881 9108

$$

MOC113-219-282245-
/O.CON.KLSX.SV.W.0114.000000T0000Z-120428T2245Z/
LINCOLN MO-WARREN MO-
506 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WARREN AND
SOUTHWESTERN LINCOLN COUNTIES UNTIL 545 PM CDT...

AT 501 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WARRENTON...
AND MOVING EAST AT 45 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

LOCATIONS IMPACTED INCLUDE...
WRIGHT CITY...TROY...MARTHASVILLE...DUTZOW AND MOSCOW MILLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3885 9126 3910 9126 3898 9085 3889 9087
      3889 9096 3855 9097 3856 9100 3861 9105
      3860 9115 3862 9122 3865 9123 3871 9131
      3870 9137 3871 9142 3884 9142
TIME...MOT...LOC 2206Z 278DEG 38KT 3881 9108

HAIL...1.00IN
WIND...<50 MPH

$$

KANOFSKY

207 
WWUS53 KLSX 282216
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
516 PM CDT SAT APR 28 2012

MOC113-219-282245-
/O.CON.KLSX.SV.W.0114.000000T0000Z-120428T2245Z/
LINCOLN MO-WARREN MO-
516 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WARREN AND
SOUTHWESTERN LINCOLN COUNTIES UNTIL 545 PM CDT...

AT 511 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WRIGHT CITY...
AND MOVING EAST AT 40 MPH.

HAZARD...HALF DOLLAR SIZE HAIL.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

IN ADDITION...HALF DOLLAR SIZE HAIL WAS REPORTED 2 MILES NORTH OF 
WARRENTON WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
WRIGHT CITY...MARTHASVILLE...MOSCOW MILLS AND DUTZOW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3898 9085 3889 9087 3889 9095 3889 9096
      3855 9097 3856 9100 3861 9105 3860 9115
      3862 9122 3885 9126 3910 9126
TIME...MOT...LOC 2215Z 287DEG 35KT 3884 9103

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...<50 MPH

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 1:14 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Montgomery	46 min
Apr 28, 1:50 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	40 min
Apr 28, 2:26 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	49 min
Apr 28, 3:05 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	40 min
Apr 28, 3:45 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	45 min
Apr 28, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	38 min
Apr 28, 4:49 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	41 min
Apr 28, 5:19 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	41 min
Apr 28, 5:27 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Jefferson, Saint Francois, Washington	48 min
Apr 28, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	40 min
Apr 28, 6:01 PM CDT	Tornado Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	29 min
Apr 28, 6:10 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	34 min
Apr 28, 6:27 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	48 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.