Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 252, NWS St. Louis, MO

August 16, 2012Clinton County, Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 16, 2012, 4:07 PM CDT for Clinton County, Marion County, Illinois. It was in force for 53 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
Aug 16, 2012, 4:07 PM CDT (21:07 UTC)
Expired
Aug 16, 2012, 5:00 PM CDT
In force
53 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Clinton County, IL, Marion County, IL

The radar

The St Louis radar (KLSX), 123 km from the middle of the area, began a volume at 20:51 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, 4:22 PM CDTHAIL 0.7New Baden, IL
Aug 16, 4:26 PM CDTTSTM WND DMG3 N Sandoval, ILSHERIFF OFFICE IN SALEM RELAYED A REPORT OF A TREE LIMB DOWN ON A POWER LINE NEAR SANDOVAL.
Aug 16, 5:10 PM CDTTSTM WND GST 583 Nw Walnut Hill, 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.

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

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.1 hours before the alert went out and 184 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°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.

713 
WUUS53 KLSX 162107
SVRLSX
ILC027-121-162200-
/O.NEW.KLSX.SV.W.0252.120816T2107Z-120816T2200Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  MARION COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 500 PM CDT

* AT 404 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
  LINE EXTENDING FROM ALTAMONT TO TAMALCO TO HIGHLAND...AND MOVING
  SOUTHEAST AT 30 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...
  NEW BADEN...BREESE...CARLYLE...SALEM...CENTRALIA...AVISTON...NEW
  MEMPHIS...ALBERS...GERMANTOWN...PATOKA...BOULDER...BECKEMEYER...
  FAIRMAN...KINMUNDY...SHATTUC...SANDOVAL...ODIN...STEPHEN FORBES
  STATE PARK...OMEGA AND CENTRAL CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

&&

LAT...LON 3847 8870 3847 8914 3850 8915 3852 8936
      3849 8940 3850 8943 3847 8947 3848 8958
      3844 8970 3865 8970 3865 8959 3864 8939
      3874 8944 3874 8914 3883 8913 3882 8869
TIME...MOT...LOC 2106Z 295DEG 25KT 3907 8875 3882 8931
          3868 8965

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

$$

BRITT
1 follow-up statement
266 
WWUS53 KLSX 162137
SVSLSX

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

ILC027-121-162200-
/O.CON.KLSX.SV.W.0252.000000T0000Z-120816T2200Z/
MARION IL-CLINTON IL-
437 PM CDT THU AUG 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CLINTON AND
MARION COUNTIES UNTIL 500 PM CDT...

AT 434 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM KINMUNDY TO CARLYLE TO OKAWVILLE...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...
SALEM...CENTRALIA...KINMUNDY...FAIRMAN...SHATTUC...SANDOVAL...STEPHEN
FORBES STATE PARK...ODIN...OMEGA...CENTRAL CITY...HELM...HUEY...
POSEY...FERRIN...ALMA...HOFFMAN...TONTI...BRUBAKER...JUNCTION CITY
AND SELMAVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

&&

LAT...LON 3847 8870 3847 8914 3850 8915 3852 8936
      3849 8940 3850 8943 3847 8947 3848 8958
      3844 8970 3865 8970 3865 8959 3864 8939
      3874 8944 3874 8914 3883 8913 3882 8869
TIME...MOT...LOC 2136Z 280DEG 35KT 3878 8887 3864 8928
          3847 8953

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

$$

BRITT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 2:11 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene39 min
Aug 16, 3:08 PM CDTSevere Thunderstorm WarningLSXMacoupin, Madison37 min
Aug 16, 3:18 PM CDTSevere Thunderstorm WarningLSXMadison, Saint Clair42 min
Aug 16, 3:28 PM CDTSevere Thunderstorm WarningLSXMonroe47 min
Aug 16, 3:43 PM CDTSevere Thunderstorm WarningLSXSaint Clair47 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, 4:25 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 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.