Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 247, NWS St. Louis, MO

August 16, 2012Jefferson County, Missouri; Monroe County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 16, 2012, 3:28 PM CDT for Jefferson County, Missouri; Monroe County, Illinois. It was in force for 47 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
Aug 16, 2012, 3:28 PM CDT (20:28 UTC)
Expired
Aug 16, 2012, 4:15 PM CDT
In force
47 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Monroe County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 58 km from the middle of the area, began a volume at 20:30 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
Aug 16, 3:44 PM CDTTSTM WND GST 50Arnold, MO
Aug 16, 3:44 PM CDTHAIL 0.88Arnold, MO
Aug 16, 3:45 PM CDTTSTM WND GST 60Hillsboro, MOPOWER LINES DOWN IN HILLSBORO
Aug 16, 4:00 PM CDTHAIL 0.7Barnhart, MO
Aug 16, 4:01 PM CDTHAIL 0.25Pevely, 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.

IssuedProductOfficeLasted
Aug 16, 1:05 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.5 hours before the alert went out and 253 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, Lincoln, IL at 12:00Z on 2012-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 817 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2012-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.193958Sfc1 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
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.

395 
WUUS53 KLSX 162028
SVRLSX
ILC133-MOC099-162115-
/O.NEW.KLSX.SV.W.0247.120816T2028Z-120816T2115Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONROE COUNTY IN SOUTHWEST ILLINOIS...
  CENTRAL JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 415 PM CDT

* AT 326 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR CEDAR
  HILL...AND MOVING EAST AT 25 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...
  HILLSBORO...ANTONIA...BARNHART...ARNOLD...PEVELY...FESTUS...
  HERCULANEUM...CRYSTAL CITY...COLUMBIA...WATERLOO...VALMEYER...
  FOUNTAIN...NEW DESIGN...OTTO...MAPAVILLE...HEMATITE...KIMMSWICK...
  HARRISONVILLE...MONROE CITY AND CHALFIN BRIDGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST
LOUIS.

&&

LAT...LON 3810 9024 3813 9025 3811 9026 3822 9064
      3846 9058 3846 9034 3843 9035 3839 9034
      3842 9030 3846 9028 3846 9018 3831 9004
      3814 9004 3809 9020
TIME...MOT...LOC 2028Z 280DEG 23KT 3833 9057

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

$$

GOSSELIN
1 follow-up statement
063 
WWUS53 KLSX 162113 RRA
SVSLSX

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

ILC133-MOC099-162123-
/O.EXP.KLSX.SV.W.0247.000000T0000Z-120816T2115Z/
MONROE IL-JEFFERSON MO-
413 PM CDT THU AUG 16 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL JEFFERSON AND MONROE
COUNTIES WILL EXPIRE AT 415 PM CDT...

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 SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM CDT.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.

LAT...LON 3810 9024 3813 9025 3811 9026 3822 9064
      3846 9058 3846 9034 3843 9035 3839 9034
      3842 9030 3846 9028 3846 9018 3831 9004
      3814 9004 3809 9020
TIME...MOT...LOC 2113Z 280DEG 23KT 3828 9021

$$

GOSSELIN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 2:07 PM CDTSevere Thunderstorm WarningLSXGasconade, Osage23 min
Aug 16, 2:15 PM CDTSevere Thunderstorm WarningLSXFranklin, Warren30 min
Aug 16, 2:37 PM CDTSevere Thunderstorm WarningLSXFranklin23 min
Aug 16, 2:54 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin, Gasconade, Washington51 min
Aug 16, 2:58 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson47 min
Aug 16, 3:08 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis, City of Saint Louis52 min
Aug 16, 3:18 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis42 min
Aug 16, 3:43 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis47 min
Aug 16, 3:54 PM CDTSevere Thunderstorm WarningLSXJefferson, Saint Francois, Washington33 min
Aug 16, 4:21 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington27 min
Aug 16, 5:26 PM CDTAreal Flood AdvisoryLSXCrawford, Washington6 hr
Aug 16, 2:11 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene39 min
Aug 16, 3:08 PM CDTSevere Thunderstorm WarningLSXMacoupin, Madison37 min
Aug 16, 3:43 PM CDTSevere Thunderstorm WarningLSXBond, Fayette, Montgomery47 min
Aug 16, 3:52 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Madison38 min
Aug 16, 4:07 PM CDTSevere Thunderstorm WarningLSXClinton, Marion53 min
Aug 16, 4:25 PM CDTSevere Thunderstorm WarningLSXFayette35 min
Aug 16, 4:26 PM CDTSevere Thunderstorm WarningLSXSaint Clair24 min
Aug 16, 4:49 PM CDTSevere Thunderstorm WarningLSXClinton, Marion, Washington56 min

Nearby

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