Alert archive / Illinois / Tornado Warnings in 2012

Tornado Warning 24, NWS St. Louis, MO

September 25, 2012Clinton County, Illinois

NWS St. Louis, MO issued this tornado warning at Sep 25, 2012, 5:07 PM CDT for Clinton County, Illinois. It was in force for 23 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
Sep 25, 2012, 5:07 PM CDT (22:07 UTC)
Expired
Sep 25, 2012, 5:30 PM CDT
In force
23 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.75 in

County Clinton County, IL

The radar

The St Louis radar (KLSX), 107 km from the middle of the area, began a volume at 22:08 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
Sep 25, 5:18 PM CDTTORNADODamiansville, ILTORNADO ON GROUND NEAR DAMIANSVILLE REPORTED BY ST. LOUIS WEATHER CHASE TEAM.
Sep 25, 5:19 PM CDTTORNADODamiansville, ILTORNADO ON GROUND NEAR DAMIANSVILLE REPORTED BY ST. LOUIS WEATHER CHASE TEAM.
Sep 25, 5:27 PM CDTHAIL 1Albers, ILQUARTER SIZE HAIL IN ALBERS.

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
Sep 25, 5:05 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.1 hours before the alert went out and 197 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 2012-09-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 221 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 2012-09-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 square meters per square second.19395878Sfc1 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
221 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
560 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

Open this sounding in Storm Lab

The text

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

982 
WFUS53 KLSX 252207
TORLSX
ILC027-252230-
/O.NEW.KLSX.TO.W.0024.120925T2207Z-120925T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
507 PM CDT TUE SEP 25 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 530 PM CDT

* AT 503 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR NEW BADEN...AND MOVING EAST AT 30 MPH.

  HAZARD...DEVELOPING TORNADO AND GOLF BALL SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...SIGNIFICANT HOUSE AND BUILDING DAMAGE POSSIBLE. MOBILE
           HOMES COMPLETELY DESTROYED IF HIT. SOME TREES UPROOTED OR
           SNAPPED. VEHICLES WILL LIKELY BE THROWN BY TORNADIC WINDS.

* LOCATIONS IMPACTED INCLUDE...
  ALBERS...GERMANTOWN...BECKEMEYER AND BARTELSO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

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 3849 8941 3850 8943 3849 8944 3848 8946
      3851 8969 3857 8969 3861 8940 3849 8939
TIME...MOT...LOC 2207Z 265DEG 25KT 3854 8963

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

TES

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 25, 3:38 AM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Marion22 min
Sep 25, 4:36 AM CDTAreal Flood AdvisoryLSXPike5 hr
Sep 25, 4:29 PM CDTSevere Thunderstorm WarningLSXClinton, Madison, Saint Clair46 min
Sep 25, 4:39 PM CDTSevere Thunderstorm WarningLSXClinton, Saint Clair51 min
Sep 25, 5:05 PM CDTSevere Thunderstorm WarningLSXClinton55 min
Sep 25, 5:09 PM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey, Madison51 min
Sep 25, 5:12 PM CDTSevere Thunderstorm WarningLSXClinton, Saint Clair18 min
Sep 25, 5:19 PM CDTTornado WarningLSXWashington26 min
Sep 25, 5:28 PM CDTSevere Thunderstorm WarningLSXMarion47 min
Sep 25, 5:34 PM CDTTornado Warning Tornado observedLSXWashington41 min
Sep 25, 5:43 PM CDTSevere Thunderstorm WarningLSXClinton, Washington62 min
Sep 25, 6:08 PM CDTSevere Thunderstorm WarningLSXMadison, Monroe, Saint Clair52 min
Sep 25, 6:14 PM CDTSevere Thunderstorm WarningLSXWashington46 min
Sep 25, 6:19 PM CDTAreal Flood AdvisoryLSXClinton, Marion, Washington6 hr
Sep 25, 6:30 PM CDTSevere Thunderstorm WarningLSXMarion26 min
Sep 25, 6:45 PM CDTSevere Thunderstorm WarningLSXClinton, Madison, Marion, Washington45 min
Sep 25, 6:50 PM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair46 min

Nearby

Tornado Warnings in Illinois, 2012Every tornado warning in 2012Tornadoes 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.