Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 7, NWS St. Louis, MO

January 17, 2012Clinton County, Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jan 17, 2012, 2:38 AM CST for Clinton County, Madison County, Saint Clair County, Illinois. It was in force for 52 min. 8 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: Jan 17, 2012, 2:38 AM CST (08:38 UTC)
Expired: Jan 17, 2012, 3:30 AM CST
In force: 52 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, IL, Madison County, IL, Saint Clair County, IL

The radar

The St Louis radar (KLSX), 82 km from the middle of the area, began a volume at 08:39 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
Jan 17, 2:40 AM CST	TSTM WND DMG	Belleville, IL	WIND DAMAGED AN OUTBUILDING AT BELLEVILLE WEST HIGH SCHOOL. TIME ESTIMATED FROM RADAR.
Jan 17, 2:41 AM CST	HAIL 0.25	Belleville, IL
Jan 17, 2:50 AM CST	HAIL 0.5	Belleville, IL
Jan 17, 3:07 AM CST	HAIL 1	Aviston, IL
Jan 17, 3:08 AM CST	TSTM WND DMG	Breese, IL	2 FOOT DIAMETER LIMB BLOWN DOWN.
Jan 17, 3:11 AM CST	TSTM WND GST 60	Aviston, IL	LAWN FURNITURE BLOWN OVER.
Jan 17, 3:21 AM CST	HAIL 1	Carlyle, IL
Jan 17, 3:25 AM CST	HAIL 0.5	Beckemeyer, IL	SPOTTER REPORTS HAIL COVERING THE GROUND

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
Jan 16, 11:47 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 8.6 hours before the alert went out and 196 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: 2 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 431 m²/s²
0-3 km storm-relative helicity: 500 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.

323 
WUUS53 KLSX 170838
SVRLSX
ILC027-119-163-170930-
/O.NEW.KLSX.SV.W.0007.120117T0838Z-120117T0930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
238 AM CST TUE JAN 17 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 330 AM CST

* AT 235 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  CENTREVILLE...AND MOVING EAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SWANSEA...FAIRVIEW HEIGHTS...SHILOH...O'FALLON...SCOTT AFB...
  LEBANON...NEW BADEN...BREESE...CARLYLE...ST. JACOB...TRENTON...
  AVISTON...ST. ROSE...JAMESTOWN...BECKEMEYER...SHATTUC...
  SUMMERFIELD...STOLLETOWN...HUEY AND KEYESPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3847 9013 3862 9018 3864 9017 3875 8962
      3874 8932 3874 8924 3861 8919
TIME...MOT...LOC 0838Z 255DEG 48KT 3858 9002
WIND...HAIL 60MPH 1.00IN

$$

TRUETT

3 follow-up statements

956 
WWUS53 KLSX 170854
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
254 AM CST TUE JAN 17 2012

ILC027-119-163-170930-
/O.CON.KLSX.SV.W.0007.000000T0000Z-120117T0930Z/
MADISON IL-ST. CLAIR IL-CLINTON IL-
254 AM CST TUE JAN 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
CLINTON...NORTHERN ST. CLAIR AND SOUTHEASTERN MADISON COUNTIES UNTIL
330 AM CST...

AT 252 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
SHILOH...MOVING EAST AT 40 MPH.

AT 250 AM CST...HALF INCH DIAMETER HAIL WAS REPORTED IN BELLEVILLE 
WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  SCOTT AFB...LEBANON...NEW BADEN...BREESE...CARLYLE...ST. JACOB...
  TRENTON...AVISTON...ST. ROSE...JAMESTOWN...BECKEMEYER...
  SUMMERFIELD...STOLLETOWN...HUEY...FERRIN AND KEYESPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3847 9013 3862 9018 3864 9017 3875 8962
      3874 8932 3874 8924 3861 8919
TIME...MOT...LOC 0854Z 256DEG 36KT 3854 8991
WIND...HAIL 60MPH 1.00IN

$$

BRITT

089 
WWUS53 KLSX 170910
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
310 AM CST TUE JAN 17 2012

ILC119-163-170917-
/O.CAN.KLSX.SV.W.0007.000000T0000Z-120117T0930Z/
MADISON IL-ST. CLAIR IL-
310 AM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ST. CLAIR AND
SOUTHEASTERN MADISON COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.  A TORNADO WARNING IS NOW IN EFFECT FOR A SEPARATE STORM THAT 
COVERS CENTRAL ST. CLAIR COUNTY UNTIL 345 AM CST.

LAT...LON 3861 8919 3853 8970 3865 8971 3866 8959
      3874 8959 3874 8924
TIME...MOT...LOC 0907Z 259DEG 50KT 3864 8955

$$

ILC027-170930-
/O.CON.KLSX.SV.W.0007.000000T0000Z-120117T0930Z/
CLINTON IL-
310 AM CST TUE JAN 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
CLINTON COUNTY UNTIL 330 AM CST...

AT 304 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
AVISTON...OR NEAR BREESE...MOVING EAST AT 55 MPH.

A TRAINED WEATHER SPOTTER REPORTED QUARTER SIZE HAIL AND ESTIMATED 
60 MPH IN AVISTON WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  CARLYLE...JAMESTOWN...BECKEMEYER...STOLLETOWN...HUEY...KEYESPORT
  AND FERRIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3861 8919 3853 8970 3865 8971 3866 8959
      3874 8959 3874 8924
TIME...MOT...LOC 0907Z 259DEG 50KT 3864 8955
WIND...HAIL 60MPH 1.00IN

$$

BRITT

128 
WWUS53 KLSX 170931
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
331 AM CST TUE JAN 17 2012

ILC027-170939-
/O.EXP.KLSX.SV.W.0007.000000T0000Z-120117T0930Z/
CLINTON IL-
331 AM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CLINTON COUNTY WILL
EXPIRE AT 330 AM CST...

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

A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN CLINTON 
COUNTY UNTIL 415 AM CST.  A TORNADO WARNING ALSO REMAINS IN EFFECT 
FOR SOUTHWESTERN CLINTON COUNTY UNTIL 345 AM CST.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 700 AM CST.

LAT...LON 3861 8919 3853 8970 3865 8971 3866 8959
      3874 8959 3874 8924
TIME...MOT...LOC 0929Z 259DEG 50KT 3870 8917

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 16, 11:59 PM CST	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	58 days
Jan 17, 1:23 AM CST	Severe Thunderstorm Warning	LSX	Calhoun	37 min
Jan 17, 2:08 AM CST	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	37 min
Jan 17, 2:17 AM CST	Severe Thunderstorm Warning	LSX	Madison	28 min
Jan 17, 2:35 AM CST	Tornado Warning	LSX	Monroe	40 min
Jan 17, 2:39 AM CST	Severe Thunderstorm Warning	LSX	Bond	36 min
Jan 17, 3:07 AM CST	Tornado Warning	LSX	Clinton, Monroe, Saint Clair, Washington	38 min
Jan 17, 3:23 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Marion	35 min
Jan 17, 3:46 AM CST	Tornado Warning	LSX	Clinton, Washington	29 min
Jan 17, 4:34 AM CST	Areal Flood Advisory	LSX	Bond, Clinton, Fayette, Macoupin, Madison, Marion and 4 more	60 days
Jan 17, 5:14 AM CST	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	46 min
Jan 17, 5:22 AM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph	38 min
Jan 17, 5:47 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion	43 min
Jan 17, 5:53 AM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair, Washington	52 min
Jan 17, 6:01 AM CST	Severe Thunderstorm Warning	LSX	Randolph	44 min
Jan 17, 6:35 AM CST	Severe Thunderstorm Warning	LSX	Randolph	25 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.