Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 246, NWS St. Louis, MO

August 16, 2012Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 16, 2012, 3:18 PM CDT for Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois. It was in force for 42 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: Aug 16, 2012, 3:18 PM CDT (20:18 UTC)
Expired: Aug 16, 2012, 4:00 PM CDT
In force: 42 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 50 km from the middle of the area, began a volume at 20:22 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
Aug 16, 3:33 PM CDT	HAIL 0.25	Granite City, IL

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
Aug 16, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.3 hours before the alert went out and 201 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: 817 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

677 
WUUS53 KLSX 162018
SVRLSX
ILC119-163-MOC189-510-162100-
/O.NEW.KLSX.SV.W.0246.120816T2018Z-120816T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
318 PM CDT THU AUG 16 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 400 PM CDT

* AT 317 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR FERGUSON...
  AND MOVING EAST AT 30 MPH.

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

  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...
  JENNINGS...BELLEFONTAINE NEIGHBORS...RIVERVIEW...SPANISH LAKE...
  VENICE...MADISON...GRANITE CITY...PONTOON BEACH...CASEYVILLE...
  COLLINSVILLE...GLEN CARBON...EDWARDSVILLE...MARYVILLE...TROY...
  BROOKLYN...FAIRMONT CITY...MITCHELL...POAG AND KUHN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3859 8987 3871 9047 3885 9026 3884 9022
      3882 9019 3883 9016 3883 9013 3880 9012
      3882 9011 3878 8985
TIME...MOT...LOC 2018Z 276DEG 28KT 3875 9028

HAIL...0.88IN
WIND...60 MPH

$$

GOSSELIN

1 follow-up statement

167 
WWUS53 KLSX 162057
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
357 PM CDT THU AUG 16 2012

ILC119-163-MOC189-510-162107-
/O.EXP.KLSX.SV.W.0246.000000T0000Z-120816T2100Z/
MADISON IL-ST. CLAIR IL-ST. LOUIS MO-ST. LOUIS CITY MO-
357 PM CDT THU AUG 16 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ST. LOUIS CITY...
NORTHEASTERN ST. LOUIS...NORTHWESTERN ST. CLAIR AND SOUTHWESTERN
MADISON COUNTIES WILL EXPIRE AT 400 PM CDT...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM CDT.

LAT...LON 3859 8987 3871 9047 3885 9026 3884 9022
      3882 9019 3883 9016 3883 9013 3880 9012
      3882 9011 3878 8985
TIME...MOT...LOC 2057Z 276DEG 28KT 3872 8989

$$

GOSSELIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 2:07 PM CDT	Severe Thunderstorm Warning	LSX	Gasconade, Osage	23 min
Aug 16, 2:15 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Warren	30 min
Aug 16, 2:37 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	23 min
Aug 16, 2:54 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Washington	51 min
Aug 16, 2:58 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson	47 min
Aug 16, 3:08 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	52 min
Aug 16, 3:28 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	47 min
Aug 16, 3:43 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	47 min
Aug 16, 3:54 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Francois, Washington	33 min
Aug 16, 4:21 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	27 min
Aug 16, 5:26 PM CDT	Areal Flood Advisory	LSX	Crawford, Washington	6 hr
Aug 16, 2:11 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene	39 min
Aug 16, 3:08 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	37 min
Aug 16, 3:43 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	47 min
Aug 16, 3:52 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison	38 min
Aug 16, 4:07 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion	53 min
Aug 16, 4:25 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	35 min
Aug 16, 4:26 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	24 min
Aug 16, 4:49 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	56 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.