Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 103, NWS St. Louis, MO

April 26, 2012Washington County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 26, 2012, 12:45 AM CDT for Washington County, Illinois. It was in force for 45 min. 4 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
Apr 26, 2012, 12:45 AM CDT (05:45 UTC)
Expired
Apr 26, 2012, 1:30 AM CDT
In force
45 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.75 in
Wind
50.0 mph

County Washington County, IL

The radar

The St Louis radar (KLSX), 123 km from the middle of the area, began a volume at 05:49 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
Apr 26, 1:05 AM CDTHAIL 0.53 N Nashville, ILAT THE INTERSECTION OF IL-127 AND I-64
Apr 26, 1:05 AM CDTHAIL 1.25Hoyleton, ILHAIL RANGED IN SIZE FROM PEA TO HALF DOLLAR.
Apr 26, 1:05 AM CDTHAIL 1.51 S New Minden, IL
Apr 26, 1:10 AM CDTHAIL 1.52 S New Minden, 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
Apr 25, 7:47 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.8 hours before the alert went out and 202 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 00:00Z on 2012-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1745 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 00:00Z on 2012-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 261 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
1745 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
1353 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
261 m²/s²
0-3 km storm-relative helicity
449 m²/s²
Significant tornado parameter
1.2
Supercell composite
4.2

Open this sounding in Storm Lab

The text

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

169 
WUUS53 KLSX 260545
SVRLSX
ILC189-260630-
/O.NEW.KLSX.SV.W.0103.120426T0545Z-120426T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1245 AM CDT THU APR 26 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 130 AM CDT

* AT 1244 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  BECKEMEYER...AND MOVING SOUTHEAST AT 45 MPH.

  HAZARD...GOLF BALL SIZE HAIL.

  SOURCE...TRAINED WEATHER SPOTTERS OBSERVED GOLF BALL SIZE HAIL.

  IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

* LOCATIONS IMPACTED INCLUDE...
  NASHVILLE...WAMAC...IRVINGTON...ASHLEY...FROGTOWN...COVINGTON...NEW
  MINDEN...HOYLETON...HUEGELY...BEAUCOUP...RICHVIEW...RADOM AND DU
  BOIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3821 8915 3821 8926 3848 8953 3847 8947
      3850 8943 3849 8940 3850 8937 3852 8936
      3851 8934 3851 8931 3850 8930 3850 8914
      3822 8914
TIME...MOT...LOC 0546Z 318DEG 38KT 3856 8945

HAIL...1.75IN
WIND...<50 MPH

$$

CVKING
3 follow-up statements
621 
WWUS53 KLSX 260556
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1256 AM CDT THU APR 26 2012

ILC189-260630-
/O.CON.KLSX.SV.W.0103.000000T0000Z-120426T0630Z/
WASHINGTON IL-
1256 AM CDT THU APR 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
WASHINGTON COUNTY UNTIL 130 AM CDT...

AT 1253 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES SOUTH OF
BECKEMEYER...AND MOVING SOUTHEAST AT 45 MPH.

HAZARD...GOLF BALL SIZE HAIL.

SOURCE...TRAINED WEATHER SPOTTERS. GOLF BALL SIZE HAIL HAS BEEN      
         OBSERVED WITH THIS STORM IN BARTELSO.

IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

IN ADDITION...GOLF BALL SIZE HAIL WAS REPORTED FROM NEAR HIGHLAND TO 
BREESE.

LOCATIONS IMPACTED INCLUDE...
NASHVILLE...IRVINGTON...ASHLEY...NEW MINDEN...HOYLETON...HUEGELY...
BEAUCOUP...RICHVIEW...RADOM AND DU BOIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3821 8915 3821 8926 3848 8953 3847 8947
      3850 8943 3849 8940 3850 8937 3852 8936
      3851 8934 3851 8931 3850 8930 3850 8914
      3822 8914
TIME...MOT...LOC 0556Z 318DEG 38KT 3848 8936

HAIL...1.75IN
WIND...<50 MPH

$$

CVKING
236 
WWUS53 KLSX 260613
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
113 AM CDT THU APR 26 2012

ILC189-260630-
/O.CON.KLSX.SV.W.0103.000000T0000Z-120426T0630Z/
WASHINGTON IL-
113 AM CDT THU APR 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WASHINGTON COUNTY UNTIL 130 AM CDT...

AT 112 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ASHLEY...AND
MOVING SOUTHEAST AT 45 MPH.

HAZARD...HALF DOLLAR SIZE HAIL.

SOURCE...TRAINED WEATHER SPOTTERS. LARGE HAIL HAS BEEN OBSERVED WITH 
         THIS THUNDERSTORM.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

LOCATIONS IMPACTED INCLUDE...
ASHLEY...RADOM AND DU BOIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.

&&

LAT...LON 3821 8915 3821 8922 3826 8927 3837 8935
      3847 8914 3822 8914
TIME...MOT...LOC 0613Z 315DEG 38KT 3834 8923

HAIL...1.25IN
WIND...<50 MPH

$$

CVKING
049 
WWUS53 KLSX 260621
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
121 AM CDT THU APR 26 2012

ILC189-260631-
/O.EXP.KLSX.SV.W.0103.000000T0000Z-120426T0630Z/
WASHINGTON IL-
121 AM CDT THU APR 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHINGTON COUNTY
WILL EXPIRE AT 130 AM CDT...

THE STORM WHICH PROMPTED THE WARNING WILL MOVE OUT OF THE WARNED 
AREA BY 130 AM CDT.

LAT...LON 3821 8915 3821 8922 3826 8927 3837 8935
      3847 8914 3822 8914
TIME...MOT...LOC 0621Z 315DEG 38KT 3828 8916

$$

CVKING

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 25, 8:21 PM CDTSevere Thunderstorm WarningLSXAdams54 min
Apr 25, 9:13 PM CDTSevere Thunderstorm WarningLSXAdams, Brown, Pike62 min
Apr 25, 9:50 PM CDTSevere Thunderstorm WarningLSXPike40 min
Apr 25, 10:21 PM CDTSevere Thunderstorm WarningLSXGreene, Pike39 min
Apr 25, 10:53 PM CDTSevere Thunderstorm WarningLSXGreene, Jersey, Macoupin67 min
Apr 25, 11:38 PM CDTSevere Thunderstorm WarningLSXFayette37 min
Apr 25, 11:44 PM CDTSevere Thunderstorm WarningLSXBond, Madison, Montgomery46 min
Apr 25, 11:55 PM CDTSevere Thunderstorm WarningLSXMadison50 min
Apr 26, 12:18 AM CDTSevere Thunderstorm WarningLSXClinton, Madison42 min
Apr 26, 2:06 AM CDTSevere Thunderstorm WarningLSXFayette, Marion28 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.