Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 259, NWS St. Louis, MO

September 5, 2012Fayette County, Montgomery County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 5, 2012, 8:38 AM CDT for Fayette County, Montgomery County, Illinois. It was in force for 37 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
Sep 5, 2012, 8:38 AM CDT (13:38 UTC)
Expired
Sep 5, 2012, 9:15 AM CDT
In force
37 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Fayette County, IL, Montgomery County, IL

The radar

The Lincoln radar (KILX), 111 km from the middle of the area, began a volume at 13:37 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 5, 8:54 AM CDTTSTM WND GST 601 N Irving, ILSEVERAL TWO TO THREE INCH LIMBS DOWN.
Sep 5, 9:05 AM CDTTSTM WND DMGWitt, ILTREES AND POWER LINES REPORTED DOWN IN WITT BY MONTGOMERY COUNTY SHERIFFS OFFICE
Sep 5, 9:07 AM CDTTSTM WND DMGHillsboro, ILMONTGOMERY COUNTY SHERIFFS OFFICE REPORT TREES DOWN IN HILLSBORO.
Sep 5, 9:16 AM CDTTSTM WND DMGWitt, ILPOWER LINES AND TREES REPORTED DOWN IN WITT... REPORTED ILLINOIS STATE DISTRICT 11.
Sep 5, 9:18 AM CDTTSTM WND DMGCoffeen, ILPOWER LINES AND TREES DOWN IN COFFEEN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 1.6 hours before the alert went out and 123 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 2012-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1271 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 2012-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.1939587897Sfc1 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
1271 J/kg
Mixed-layer CIN
-188 J/kg
Mixed-layer LCL
1037 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
138 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

896 
WUUS53 KLSX 051338
SVRLSX
ILC051-135-051415-
/O.NEW.KLSX.SV.W.0259.120905T1338Z-120905T1415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
838 AM CDT WED SEP 5 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...
  MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 915 AM CDT

* AT 833 AM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
  LINE EXTENDING FROM MORRISONVILLE TO RAYMOND TO LITCHFIELD...AND
  MOVING SOUTHEAST AT 40 MPH.

  HAZARD...60 MPH WIND GUSTS.

  SOURCE...PUBLIC REPORTED POWER POLE SNAPPED NEAR NILWOOD AT AROUND
  820 AM. 

  IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
           BROKEN.

* LOCATIONS IMPACTED INCLUDE...
  NOKOMIS...HILLSBORO...WITT...TAYLOR SPRINGS...COFFEEN...VAN
  BURENSBURG...RAMSEY...WRIGHTS CORNER...BUTLER...WENONAH...
  COALTON...OHLMAN...IRVING...CHAPMAN...FILLMORE...BINGHAM...BAYLE
  CITY AND SHAFTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

LARGE HAIL...DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND LIGHTNING
IS OCCURRING WITH THESE STORMS. MOVE INDOORS IMMEDIATELY. LIGHTNING
KILLS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO
BE STRUCK BY LIGHTNING.

&&

LAT...LON 3908 8891 3895 8920 3898 8926 3903 8925
      3902 8934 3916 8959 3929 8950 3935 8952
      3936 8951 3939 8954 3940 8953 3936 8951
      3935 8914 3922 8913 3922 8881 3921 8880
TIME...MOT...LOC 1337Z 299DEG 36KT 3940 8933 3930 8946
          3921 8961

HAIL...<.75IN
WIND...60 MPH

$$

BROWNING
1 follow-up statement
943 
WWUS53 KLSX 051352
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
852 AM CDT WED SEP 5 2012

ILC051-135-051415-
/O.CON.KLSX.SV.W.0259.000000T0000Z-120905T1415Z/
MONTGOMERY IL-FAYETTE IL-
852 AM CDT WED SEP 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
FAYETTE AND MONTGOMERY COUNTIES UNTIL 915 AM CDT...

AT 847 AM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM 5 MILES NORTHEAST OF NOKOMIS TO WITT TO
HILLSBORO...AND MOVING SOUTHEAST AT 40 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
         BROKEN.

LOCATIONS IMPACTED INCLUDE...
COFFEEN...VAN BURENSBURG...RAMSEY...WRIGHTS CORNER...CHAPMAN...
FILLMORE...BINGHAM...BAYLE CITY AND SHAFTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

LARGE HAIL...DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND LIGHTNING
IS OCCURRING WITH THESE STORMS. MOVE INDOORS IMMEDIATELY. LIGHTNING
KILLS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO
BE STRUCK BY LIGHTNING.

&&

LAT...LON 3908 8891 3895 8920 3898 8926 3903 8925
      3902 8934 3916 8959 3929 8950 3935 8952
      3936 8951 3939 8954 3940 8953 3936 8951
      3935 8914 3922 8913 3922 8881 3921 8880
TIME...MOT...LOC 1352Z 299DEG 36KT 3933 8916 3923 8929
          3914 8944

HAIL...<.75IN
WIND...60 MPH

$$

BROWNING

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 3:07 AM CDTHeat AdvisoryLSXMadison, Monroe, Randolph, Saint Clair12 hr
Sep 5, 6:36 AM CDTSevere Thunderstorm WarningLSXAdams, Brown, Pike30 min
Sep 5, 7:56 AM CDTSevere Thunderstorm WarningLSXGreene, Macoupin, Montgomery64 min
Sep 5, 9:08 AM CDTTornado WarningLSXFayette, Montgomery37 min
Sep 5, 9:40 AM CDTSevere Thunderstorm WarningLSXFayette50 min
Sep 5, 10:00 AM CDTSevere Thunderstorm WarningLSXClinton, Fayette, Marion48 min
Sep 5, 10:23 AM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair32 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.