Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 97, NWS St. Louis, MO

April 25, 2012Greene County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 25, 2012, 10:21 PM CDT for Greene County, Pike County, Illinois. It was in force for 39 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 25, 2012, 10:21 PM CDT (03:21 UTC)
Expired
Apr 25, 2012, 11:00 PM CDT
In force
39 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Greene County, IL, Pike County, IL

The radar

The St Louis radar (KLSX), 94 km from the middle of the area, began a volume at 03:22 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 25, 10:25 PM CDTHAIL 1Pittsfield, IL
Apr 25, 10:26 PM CDTHAIL 13 E Pittsfield, IL
Apr 25, 10:45 PM CDTHAIL 0.5White Hall, ILSPOTTER ALSO REPORTED GUSTY WINDS OF 30 TO 40 MPH
Apr 25, 10:55 PM CDTHAIL 0.75White Hall, ILWIND GUSTS ESTIMATES OF 35 TO 45 MPH. SOME SMALL BRANCHES DOWN 1 INCH IN DIAMETER AND SMALLER

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, 3.4 hours before the alert went out and 177 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.

205 
WUUS53 KLSX 260321
SVRLSX
ILC061-149-260400-
/O.NEW.KLSX.SV.W.0097.120426T0321Z-120426T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1021 PM CDT WED APR 25 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
  EAST CENTRAL PIKE COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 1100 PM CDT

* AT 1018 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  PITTSFIELD...AND MOVING SOUTHEAST AT 40 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

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

* LOCATIONS IMPACTED INCLUDE...
  WHITE HALL...ROODHOUSE...ATHENSVILLE...GREENFIELD...TIME...
  DETROIT...MILTON...MONTEZUMA...BEDFORD...HILLVIEW...PATTERSON...
  BARROW...BELLTOWN AND WRIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3958 9058 3954 9057 3953 9057 3953 9022
      3951 9015 3927 9015 3946 9060 3962 9089
      3969 9079
TIME...MOT...LOC 0322Z 300DEG 36KT 3961 9071

HAIL...1.00IN
WIND...<50 MPH

$$

CVKING
2 follow-up statements
725 
WWUS53 KLSX 260326
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1026 PM CDT WED APR 25 2012

ILC061-149-260400-
/O.CON.KLSX.SV.W.0097.000000T0000Z-120426T0400Z/
PIKE IL-GREENE IL-
1026 PM CDT WED APR 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
GREENE COUNTY IN SOUTHWEST ILLINOIS...AND EAST CENTRAL PIKE COUNTY IN
WEST CENTRAL ILLINOIS UNTIL 1100 PM CDT...

AT 1022 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 5 MILES EAST OF
PITTSFIELD...AND MOVING SOUTHEAST AT 40 MPH.

HAZARD...GOLF BALL SIZE HAIL.

SOURCE...RADAR INDICATED.

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

LOCATIONS IMPACTED INCLUDE...
WHITE HALL...ROODHOUSE...ATHENSVILLE...GREENFIELD...MILTON...
MONTEZUMA...BEDFORD...HILLVIEW...PATTERSON...BARROW AND WRIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3958 9058 3953 9057 3953 9021 3951 9015
      3927 9015 3946 9059 3957 9080 3966 9074
TIME...MOT...LOC 0326Z 300DEG 36KT 3959 9067

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

$$

CVKING
867 
WWUS53 KLSX 260342
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1042 PM CDT WED APR 25 2012

ILC149-260353-
/O.CAN.KLSX.SV.W.0097.000000T0000Z-120426T0400Z/
PIKE IL-
1042 PM CDT WED APR 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIKE COUNTY IN
WEST CENTRAL ILLINOIS IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3951 9016 3950 9015 3927 9015 3947 9060
      3953 9058 3953 9019
TIME...MOT...LOC 0343Z 302DEG 37KT 3944 9037

$$

ILC061-260400-
/O.CON.KLSX.SV.W.0097.000000T0000Z-120426T0400Z/
GREENE IL-
1042 PM CDT WED APR 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
GREENE COUNTY UNTIL 1100 PM CDT...

AT 1041 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WHITE HALL...
AND MOVING SOUTHEAST AT 45 MPH.

HAZARD...GOLF BALL SIZE HAIL.

SOURCE...RADAR INDICATED.

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

LOCATIONS IMPACTED INCLUDE...
ATHENSVILLE...GREENFIELD AND WRIGHTS.

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 3951 9016 3950 9015 3927 9015 3947 9060
      3953 9058 3953 9019
TIME...MOT...LOC 0343Z 302DEG 37KT 3944 9037

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

$$

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, 10:53 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, 12:45 AM CDTSevere Thunderstorm WarningLSXWashington45 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.