Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 126, NWS St. Louis, MO

April 28, 2012Fayette County, Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 6:58 PM CDT for Fayette County, Marion County, Illinois. It was in force for 32 min. 2 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 28, 2012, 6:58 PM CDT (23:58 UTC)
Expired: Apr 28, 2012, 7:30 PM CDT
In force: 32 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Fayette County, IL, Marion County, IL

The radar

The Evansville,IN radar (KVWX), 116 km from the middle of the area, began a volume at 00:03 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

Time	Report	Where	Remark
Apr 28, 7:03 PM CDT	HAIL 1	Farina, IL	ENOUGH HAIL THAT IT LOOKS LIKE IT SNOWED AND VERY DENSE FOG HAS NOW DEVELOPED
Apr 28, 7:03 PM CDT	HAIL 1.75	Kinmundy, IL	MEASURED BY A STATE TROOPER

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.

Issued	Product	Office	Lasted
Apr 28, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 28, 5:15 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 12.0 hours before the alert went out and 144 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 681 m²/s²
0-3 km storm-relative helicity: 811 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

995 
WUUS53 KLSX 282358
SVRLSX
ILC051-121-290030-
/O.NEW.KLSX.SV.W.0126.120428T2358Z-120429T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
658 PM CDT SAT APR 28 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTHEASTERN MARION COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 730 PM CDT

* AT 654 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED JUST WEST OF
  FARINA...AND MOVING EAST AT 35 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...
  FARINA AND LA CLEDE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3873 8895 3898 8894 3898 8880 3891 8880
      3892 8878 3892 8870 3891 8869 3873 8869
TIME...MOT...LOC 2358Z 270DEG 32KT 3887 8880

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

$$

BYRD

1 follow-up statement

959 
WWUS53 KLSX 290025
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
725 PM CDT SAT APR 28 2012

ILC051-121-290035-
/O.EXP.KLSX.SV.W.0126.000000T0000Z-120429T0030Z/
MARION IL-FAYETTE IL-
725 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FAYETTE AND
NORTHEASTERN MARION COUNTIES WILL EXPIRE AT 730 PM CDT...

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

LAT...LON 3873 8895 3898 8894 3898 8880 3891 8880
      3892 8878 3892 8870 3891 8869 3873 8869
TIME...MOT...LOC 0025Z 270DEG 32KT 3887 8849

$$

BYRD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 2:26 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	49 min
Apr 28, 3:05 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Madison	40 min
Apr 28, 3:45 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	45 min
Apr 28, 3:59 PM CDT	Tornado Warning	LSX	Saint Clair	31 min
Apr 28, 4:22 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	38 min
Apr 28, 4:28 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	47 min
Apr 28, 4:56 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	49 min
Apr 28, 5:13 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	47 min
Apr 28, 5:38 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	37 min
Apr 28, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	40 min
Apr 28, 6:01 PM CDT	Tornado Warning	LSX	Madison, Saint Clair	29 min
Apr 28, 6:10 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	34 min
Apr 28, 6:17 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	33 min
Apr 28, 6:27 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	48 min
Apr 28, 6:35 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	25 min
Apr 28, 6:53 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	52 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2012 Every 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.