Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 107, NWS St. Louis, MO

April 28, 2012Lincoln County, Saint Charles County, Warren County, Missouri; Calhoun County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 2:26 PM CDT for Lincoln County, Saint Charles County, Warren County, Missouri; Calhoun County, Illinois. It was in force for 49 min. 5 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, 2:26 PM CDT (19:26 UTC)
Expired: Apr 28, 2012, 3:15 PM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calhoun County, IL, Lincoln County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 31 km from the middle of the area, began a volume at 19:27 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, 2:30 PM CDT	HAIL 1	4 N Wright City, MO
Apr 28, 2:39 PM CDT	HAIL 1	3 Nw Wentzville, MO
Apr 28, 2:40 PM CDT	HAIL 1.75	Wentzville, MO	2 MILES NORTH OF INTERSTATE 70 ON US HWY 61
Apr 28, 3:15 PM CDT	HAIL 1	2 N St. Charles, MO
Apr 28, 3:15 PM CDT	HAIL 1.5	2 N St. Charles, 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, 7.4 hours before the alert went out and 223 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.

506 
WUUS53 KLSX 281926
SVRLSX
ILC013-MOC113-183-219-282015-
/O.NEW.KLSX.SV.W.0107.120428T1926Z-120428T2015Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 315 PM CDT

* AT 222 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 5 MILES NORTH OF
  WARRENTON...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...
  WRIGHT CITY...TROY...WENTZVILLE...ST. PAUL...MOSCOW MILLS...
  WINFIELD...CAVE...FORISTELL...FLINT HILL...OLD MONROE...FOLEY...
  BEECHVILLE...BATCHTOWN...MEPPEN...GOLDEN EAGLE...BRUSSELS AND
  KAMPVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3905 9059 3902 9057 3899 9057 3899 9056
      3880 9050 3877 9119 3903 9115 3907 9059
TIME...MOT...LOC 1925Z 262DEG 33KT 3890 9108

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

$$

BYRD

1 follow-up statement

665 
WWUS53 KLSX 281945
SVSLSX

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

MOC219-281953-
/O.CAN.KLSX.SV.W.0107.000000T0000Z-120428T2015Z/
WARREN MO-
245 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WARREN COUNTY IS
CANCELLED...

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

LAT...LON 3905 9059 3902 9057 3902 9058 3899 9057
      3898 9056 3880 9050 3878 9095 3905 9090
      3907 9059
TIME...MOT...LOC 1943Z 268DEG 38KT 3887 9083

$$

ILC013-MOC113-183-282015-
/O.CON.KLSX.SV.W.0107.000000T0000Z-120428T2015Z/
CALHOUN IL-LINCOLN MO-ST. CHARLES MO-
245 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
ST. CHARLES...SOUTHEASTERN LINCOLN AND CALHOUN COUNTIES UNTIL 315 PM
CDT...

AT 242 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WENTZVILLE...
AND MOVING EAST AT 45 MPH.

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

SOURCE...TRAINED WEATHER SPOTTERS REPORTED GOLFBALL SIZED HAIL 
         ON THE EAST SIDE OF WENTZVILLE AT 240 PM.

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


LOCATIONS IMPACTED INCLUDE...
ST. PAUL...WINFIELD...OLD MONROE...FOLEY...BATCHTOWN...BEECHVILLE...
MEPPEN...BRUSSELS...GOLDEN EAGLE AND KAMPVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3905 9059 3902 9057 3902 9058 3899 9057
      3898 9056 3880 9050 3878 9095 3905 9090
      3907 9059
TIME...MOT...LOC 1943Z 268DEG 38KT 3887 9083

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

$$

BYRD

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, 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, 4:55 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	50 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
Apr 28, 3:59 PM CDT	Tornado Warning	LSX	Saint Clair	31 min
Apr 28, 4:22 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	38 min
Apr 28, 4:28 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	47 min
Apr 28, 4:56 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	49 min
Apr 28, 5:13 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	47 min
Apr 28, 5:38 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	37 min
Apr 28, 6:17 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	33 min
Apr 28, 6:35 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	25 min
Apr 28, 6:53 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	52 min
Apr 28, 6:58 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	32 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2012 Severe Thunderstorm Warnings in Illinois, 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.