Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 338, NWS St. Louis, MO

October 22, 2012Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Oct 22, 2012, 10:34 AM CDT for Madison County, Illinois. It was in force for 41 min. 1 report 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: Oct 22, 2012, 10:34 AM CDT (15:34 UTC)
Expired: Oct 22, 2012, 11:15 AM CDT
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Madison County, IL

The radar

The St Louis radar (KLSX), 67 km from the middle of the area, began a volume at 15:37 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

Time	Report	Where	Remark
Oct 22, 11:12 AM CDT	HAIL 0.25	Wood River, IL

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, 3.6 hours before the alert went out and 186 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: 620 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 653 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

172 
WUUS53 KLSX 221534
SVRLSX
ILC119-221615-
/O.NEW.KLSX.SV.W.0338.121022T1534Z-121022T1615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1034 AM CDT MON OCT 22 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MADISON COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 1115 AM CDT

* AT 1028 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BETHALTO...
  AND MOVING EAST AT 40 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...TRAINED WEATHER SPOTTERS.  QUARTER SIZE HAIL WAS REPORTED
           WITH THIS STORM IN WOOD RIVER AT 1027 AM CDT.

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

* LOCATIONS IMPACTED INCLUDE...
  PRAIRIETOWN...CARPENTER...WORDEN...MARINE...LIVINGSTON...
  ALHAMBRA...FRUIT...HAMEL...KAUFMAN...WILLIAMSON...GRANTFORK AND NEW
  DOUGLAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3871 9021 3873 9021 3881 9012 3885 9011
      3886 9014 3899 9006 3900 8964 3888 8964
      3887 8961 3878 8959 3875 8960
TIME...MOT...LOC 1533Z 256DEG 34KT 3888 8992

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

$$

BRITT

3 follow-up statements

065 
WWUS53 KLSX 221550
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1050 AM CDT MON OCT 22 2012

ILC119-221615-
/O.CON.KLSX.SV.W.0338.000000T0000Z-121022T1615Z/
MADISON IL-
1050 AM CDT MON OCT 22 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MADISON COUNTY
UNTIL 1115 AM CDT...

AT 1046 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ALHAMBRA.  A 
SECOND SEVERE THUNDERSTORM WAS LOCATED ON THE WEST SIDE OF 
EDWARDSVILLE.  BOTH OF THESE STORMS ARE MOVING EAST AT 40 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...TRAINED WEATHER SPOTTERS.  QUARTER SIZE HAIL WAS REPORTED 
         EARLIER IN WOOD RIVER.

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

LOCATIONS IMPACTED INCLUDE...
GRANTFORK...NEW DOUGLAS...EDWARDSVILLE AND MARINE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3872 9008 3899 9006 3900 8964 3888 8964
      3887 8961 3879 8959 3875 8960
TIME...MOT...LOC 1548Z 256DEG 34KT 3891 8974

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

$$

BRITT

047 
WWUS53 KLSX 221604
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1104 AM CDT MON OCT 22 2012

ILC119-221615-
/O.CON.KLSX.SV.W.0338.000000T0000Z-121022T1615Z/
MADISON IL-
1104 AM CDT MON OCT 22 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MADISON COUNTY
UNTIL 1115 AM CDT...

AT 1058 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR CARPENTER.  
A SECOND STRONG STORM WAS MOVING ACROSS THE MISSISSIPPI RIVER INTO 
WESTERN MADISON COUNTY.  BOTH OF THESE STORMS ARE MOVING NORTHEAST 
AT 40 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

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

LOCATIONS IMPACTED INCLUDE...
WORDEN...ALHAMBRA...LIVINGSTON...KAUFMAN...GRANTFORK...WILLIAMSON AND
NEW DOUGLAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3872 9008 3899 9006 3900 8964 3888 8964
      3887 8961 3879 8959 3875 8960
TIME...MOT...LOC 1603Z 243DEG 36KT 3888 8985

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

$$

BRITT

417 
WWUS53 KLSX 221613
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1113 AM CDT MON OCT 22 2012

ILC119-221621-
/O.EXP.KLSX.SV.W.0338.000000T0000Z-121022T1615Z/
MADISON IL-
1113 AM CDT MON OCT 22 2012

...THE SEVERE THUNDERSTORM WARNING FOR MADISON COUNTY WILL EXPIRE AT
1115 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED THE WARNED AREA.

STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL CONTINUE TO 
MOVE EAST ACROSS THE AREA.

LAT...LON 3872 9008 3899 9006 3900 8964 3888 8964
      3887 8961 3879 8959 3875 8960
TIME...MOT...LOC 1611Z 243DEG 36KT 3892 8976

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 22, 6:20 AM CDT	Severe Thunderstorm Warning	LSX	Adams	55 min
Oct 22, 6:56 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	49 min
Oct 22, 7:43 AM CDT	Severe Thunderstorm Warning	LSX	Pike	47 min
Oct 22, 9:30 AM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin	45 min
Oct 22, 11:38 AM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	37 min
Oct 22, 2:04 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	24 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.