Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 108, NWS St. Louis, MO

April 28, 2012Saint Charles County, Saint Louis County, City of Saint Louis, Missouri; Calhoun County, Jersey County, Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 3:05 PM CDT for Saint Charles County, Saint Louis County, City of Saint Louis, Missouri; Calhoun County, Jersey County, Madison County, Illinois. It was in force for 40 min. 22 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, 3:05 PM CDT (20:05 UTC)
Expired: Apr 28, 2012, 3:45 PM CDT
In force: 40 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Calhoun County, IL, Jersey County, IL, Madison County, IL, City of Saint Louis, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 27 km from the middle of the area, began a volume at 20:06 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, 3:10 PM CDT	HAIL 0.25	St. Peters, MO
Apr 28, 3:10 PM CDT	HAIL 0.88	St. Charles, MO	AT I 70 AND ZUMBHEL
Apr 28, 3:14 PM CDT	HAIL 1	St. Charles, MO	NEAR INTERSECTION OF ELM AND HUNTERS RIDGE
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
Apr 28, 3:23 PM CDT	HAIL 1.75	2 Nw Florissant, MO
Apr 28, 3:24 PM CDT	HAIL 1	1 N Hazelwood, MO
Apr 28, 3:25 PM CDT	HAIL 0.88	Black Jack, MO
Apr 28, 3:25 PM CDT	HAIL 1.25	Bridgeton, MO	3 MILES WEST OF LAMBERT
Apr 28, 3:25 PM CDT	HAIL 1.25	Florissant, MO
Apr 28, 3:25 PM CDT	HAIL 1.75	Hazelwood, MO	SEVERAL REPORTS OF GOLFBALL SIZE HAIL IN HAZELWOOD
Apr 28, 3:26 PM CDT	HAIL 2	1 N Hazelwood, MO
Apr 28, 3:27 PM CDT	HAIL 1	1 Ssw Hazelwood, MO	REPORTED AT LAMBERT AIRPORT
Apr 28, 3:28 PM CDT	HAIL 1.75	Hazelwood, MO
Apr 28, 3:28 PM CDT	HAIL 2	Florissant, MO	NEAR INTERSECTION OF CHARBONIER AND SHACKELFORD
Apr 28, 3:35 PM CDT	HAIL 1.75	Florissant, MO
Apr 28, 3:42 PM CDT	HAIL 1.25	Ferguson, MO
Apr 28, 3:43 PM CDT	HAIL 1	Granite City, IL
Apr 28, 3:44 PM CDT	HAIL 1	Riverview, MO	HAS LASTED OVER 5 MINUTES
Apr 28, 3:48 PM CDT	TSTM WND GST 60	Granite City, IL
Apr 28, 3:50 PM CDT	HAIL 2.5	Granite City, IL
Apr 28, 3:53 PM CDT	HAIL 1.75	Granite City, IL	GROUND IS COVERED IN HAIL

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, 8.1 hours before the alert went out and 214 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.

390 
WUUS53 KLSX 282005
SVRLSX
ILC013-083-119-MOC183-189-510-282045-
/O.NEW.KLSX.SV.W.0108.120428T2005Z-120428T2045Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHWESTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 345 PM CDT

* AT 301 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 6 MILES EAST OF
  ST. PAUL...AND MOVING EAST AT 35 MPH.

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

  SOURCE...RADAR INDICATED.

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

* LOCATIONS IMPACTED INCLUDE...
  ST. CHARLES...MARYLAND HEIGHTS...BRIDGETON...ST. ANN...LAMBERT
  FIELD...OVERLAND...HAZELWOOD...WOODSON TERRACE...ST. JOHN...
  BERKELEY...FLORISSANT...BEL-RIDGE...KINLOCH...COOL VALLEY...
  NORMANDY...FERGUSON...HILLSDALE...NORTHWOODS...DELLWOOD AND BLACK
  JACK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3866 9010 3866 9018 3873 9074 3894 9068
      3894 9067 3895 9067 3900 9066 3900 9007
TIME...MOT...LOC 2005Z 272DEG 32KT 3886 9059

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

$$

BYRD

1 follow-up statement

403 
WWUS53 KLSX 282025
SVSLSX

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

ILC013-282035-
/O.CAN.KLSX.SV.W.0108.000000T0000Z-120428T2045Z/
CALHOUN IL-
325 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CALHOUN COUNTY IS
CANCELLED...

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

LAT...LON 3900 9043 3900 9007 3866 9010 3866 9018
      3871 9054
TIME...MOT...LOC 2025Z 273DEG 36KT 3884 9034

$$

ILC083-119-MOC183-189-510-282045-
/O.CON.KLSX.SV.W.0108.000000T0000Z-120428T2045Z/
JERSEY IL-MADISON IL-ST. CHARLES MO-ST. LOUIS MO-ST. LOUIS CITY MO-
325 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN ST.
LOUIS CITY...NORTHEASTERN ST. LOUIS...NORTHEASTERN ST. CHARLES...
WESTERN MADISON AND SOUTH CENTRAL JERSEY COUNTIES UNTIL 345 PM CDT...

AT 321 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED JUST SOUTHEAST OF 
ORCHARD FARMS...AND MOVING EAST AT 40 MPH.

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

SOURCE...RADAR INDICATED.

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

LOCATIONS IMPACTED INCLUDE...
BERKELEY...FLORISSANT...BEL-RIDGE...KINLOCH...COOL VALLEY...
NORMANDY...FERGUSON...HILLSDALE...DELLWOOD...NORTHWOODS...BLACK
JACK...JENNINGS...BELLEFONTAINE NEIGHBORS...RIVERVIEW...SPANISH
LAKE...GODFREY...ALTON...VENICE...MADISON AND GRANITE CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3900 9043 3900 9007 3866 9010 3866 9018
      3871 9054
TIME...MOT...LOC 2025Z 273DEG 36KT 3884 9034

HAIL...1.75IN
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, 2:26 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	49 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.