Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 14, NWS St. Louis, MO

January 17, 20124 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jan 17, 2012, 5:53 AM CST for 4 counties in Illinois. It was in force for 52 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: Jan 17, 2012, 5:53 AM CST (11:53 UTC)
Expired: Jan 17, 2012, 6:45 AM CST
In force: 52 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 113 km from the middle of the area, began a volume at 11:54 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, 6:01 AM CST	HAIL 0.25	7 E Red Bud, IL
Jan 17, 6:15 AM CST	TSTM WND GST 51	1 E Sparta, 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.

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, 11.9 hours before the alert went out and 228 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.

178 
WUUS53 KLSX 171153
SVRLSX
ILC133-157-163-189-171245-
/O.NEW.KLSX.SV.W.0014.120117T1153Z-120117T1245Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL MONROE COUNTY IN SOUTHWEST ILLINOIS...
  NORTHERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHEASTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 645 AM CST

* AT 550 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR RED BUD...AND MOVING EAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SPARTA...NASHVILLE...BALDWIN...MARISSA...TILDEN...COULTERVILLE...
  LIVELY GROVE...ASHLEY...LENZBURG...HOUSTON...ELKTON...OAKDALE...
  CORDES...POSEN...BEAUCOUP...DU BOIS...RADOM AND RICHVIEW.

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 3821 8916 3822 8959 3816 8959 3810 9004
      3828 9003 3842 8915
TIME...MOT...LOC 1153Z 261DEG 49KT 3819 8996
WIND...HAIL 60MPH 1.50IN

$$

TRUETT

3 follow-up statements

107 
WWUS53 KLSX 171204
SVSLSX

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

ILC133-171214-
/O.CAN.KLSX.SV.W.0014.000000T0000Z-120117T1245Z/
MONROE IL-
604 AM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONROE COUNTY IS
CANCELLED...

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

LAT...LON 3821 8916 3822 8959 3816 8959 3812 8994
      3830 8988 3842 8915
TIME...MOT...LOC 1204Z 261DEG 53KT 3820 8976

$$

ILC157-163-189-171245-
/O.CON.KLSX.SV.W.0014.000000T0000Z-120117T1245Z/
RANDOLPH IL-ST. CLAIR IL-WASHINGTON IL-
604 AM CST TUE JAN 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WASHINGTON...SOUTHEASTERN ST. CLAIR AND NORTHEASTERN RANDOLPH
COUNTIES UNTIL 645 AM CST...

AT 600 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
BALDWIN...OR 7 MILES WEST OF SPARTA...MOVING EAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  SPARTA...NASHVILLE...MARISSA...TILDEN...COULTERVILLE...LIVELY
  GROVE...ASHLEY...ELKTON...OAKDALE...CORDES...POSEN...BEAUCOUP...DU
  BOIS...RADOM AND RICHVIEW.

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 3821 8916 3822 8959 3816 8959 3812 8994
      3830 8988 3842 8915
TIME...MOT...LOC 1204Z 261DEG 53KT 3820 8976
WIND...HAIL 60MPH 1.00IN

$$

TRUETT

127 
WWUS53 KLSX 171219
SVSLSX

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

ILC163-171229-
/O.CAN.KLSX.SV.W.0014.000000T0000Z-120117T1245Z/
ST. CLAIR IL-
619 AM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. CLAIR COUNTY
IS CANCELLED...

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

LAT...LON 3816 8970 3827 8967 3842 8915 3821 8916
      3822 8959 3816 8959
TIME...MOT...LOC 1219Z 259DEG 45KT 3824 8956

$$

ILC157-189-171245-
/O.CON.KLSX.SV.W.0014.000000T0000Z-120117T1245Z/
RANDOLPH IL-WASHINGTON IL-
619 AM CST TUE JAN 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WASHINGTON AND NORTHEASTERN RANDOLPH COUNTIES UNTIL 645 AM CST...

AT 617 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
COULTERVILLE...OR 8 MILES NORTHEAST OF SPARTA...MOVING EAST AT 50
MPH.

LOCATIONS IMPACTED INCLUDE...
  NASHVILLE...ASHLEY...ELKTON...OAKDALE...CORDES...POSEN...
  BEAUCOUP...DU BOIS...RADOM AND RICHVIEW.

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 3816 8970 3827 8967 3842 8915 3821 8916
      3822 8959 3816 8959
TIME...MOT...LOC 1219Z 259DEG 45KT 3824 8956
WIND...HAIL 60MPH 1.00IN

$$

TRUETT

180 
WWUS53 KLSX 171241
SVSLSX

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

ILC157-189-171251-
/O.EXP.KLSX.SV.W.0014.000000T0000Z-120117T1245Z/
RANDOLPH IL-WASHINGTON IL-
641 AM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WASHINGTON AND
NORTHEASTERN RANDOLPH COUNTIES WILL EXPIRE AT 645 AM CST...

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

LAT...LON 3816 8970 3827 8967 3842 8915 3821 8916
      3822 8959 3816 8959
TIME...MOT...LOC 1241Z 259DEG 45KT 3829 8922

$$

TRUETT

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, 2:38 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	52 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, 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.