Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 66, NWS St. Louis, MO

April 15, 2011Clinton County, Fayette County, Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 15, 2011, 6:07 PM CDT for Clinton County, Fayette County, Marion County, Illinois. It was in force for 53 min. 3 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 15, 2011, 6:07 PM CDT (23:07 UTC)
Expired: Apr 15, 2011, 7:00 PM CDT
In force: 53 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, IL, 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 23:07 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 15, 6:08 PM CDT	TSTM WND DMG	2 Ene Shattuc, IL	ROOF PARTIALLY BLOWN OFF MOBILE HOME
Apr 15, 6:26 PM CDT	TSTM WND GST 53	1 Sse Tonti, IL
Apr 15, 6:41 PM CDT	TSTM WND GST 49	Alma, 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
Apr 15, 12:47 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.1 hours before the alert went out and 155 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: 1776 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 129 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.

395 
WUUS53 KLSX 152307
SVRLSX
ILC027-051-121-160000-
/O.NEW.KLSX.SV.W.0066.110415T2307Z-110416T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
607 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 700 PM CDT

* AT 605 PM CDT...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
  CENTRAL CITY...OR NEAR CENTRALIA...AND MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SALEM...VANDALIA...SANDOVAL...ODIN...BOULDER...FAIRMAN...PATOKA...
  OMEGA...STEPHEN FORBES STATE PARK...KINMUNDY...SHOBONIER...
  FARINA...BROWNSTOWN...CARTTER...SELMAVILLE...TONTI...IUKA...
  BRUBAKER...ALMA AND VERNON.

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.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3847 8883 3860 8927 3905 8914 3898 8881
      3892 8880 3892 8870 3879 8869
TIME...MOT...LOC 2308Z 203DEG 39KT 3858 8909
WIND...HAIL 60MPH 1.00IN

$$

GLASS

2 follow-up statements

318 
WWUS53 KLSX 152330
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
630 PM CDT FRI APR 15 2011

ILC027-152340-
/O.CAN.KLSX.SV.W.0066.000000T0000Z-110416T0000Z/
CLINTON IL-
630 PM CDT FRI APR 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLINTON COUNTY IS
CANCELLED...

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

LAT...LON 3876 8871 3866 8875 3872 8914 3874 8915
      3874 8920 3905 8914 3898 8881 3892 8880
      3892 8870 3876 8870
TIME...MOT...LOC 2330Z 195DEG 49KT 3885 8901

$$

ILC051-121-160000-
/O.CON.KLSX.SV.W.0066.000000T0000Z-110416T0000Z/
MARION IL-FAYETTE IL-
630 PM CDT FRI APR 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
FAYETTE AND NORTHERN MARION COUNTIES UNTIL 700 PM CDT...

AT 629 PM CDT...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
SHOBONIER...OR 11 MILES SOUTHEAST OF VANDALIA...MOVING NORTH AT 55
MPH.

LOCATIONS IMPACTED INCLUDE...
  VANDALIA...FARINA...BROWNSTOWN...ST. PETER...LOOGOOTEE...LA CLEDE
  AND ST. JAMES.

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.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3876 8871 3866 8875 3872 8914 3874 8915
      3874 8920 3905 8914 3898 8881 3892 8880
      3892 8870 3876 8870
TIME...MOT...LOC 2330Z 195DEG 49KT 3885 8901
WIND...HAIL 60MPH 1.00IN

$$

GLASS

132 
WWUS53 KLSX 152353
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
653 PM CDT FRI APR 15 2011

ILC051-121-160003-
/O.EXP.KLSX.SV.W.0066.000000T0000Z-110416T0000Z/
MARION IL-FAYETTE IL-
653 PM CDT FRI APR 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN FAYETTE AND NORTHERN
MARION COUNTIES WILL EXPIRE AT 700 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA AND INTO NORTHERN FAYETTE COUNTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 900 PM.

LAT...LON 3876 8871 3866 8875 3872 8914 3874 8915
      3874 8920 3905 8914 3898 8881 3892 8880
      3892 8870 3876 8870
TIME...MOT...LOC 2353Z 195DEG 49KT 3915 8891

$$

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 1:09 PM CDT	Severe Thunderstorm Warning	LSX	Pike	51 min
Apr 15, 1:53 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	35 min
Apr 15, 2:23 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	22 min
Apr 15, 2:52 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	53 min
Apr 15, 2:54 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	51 min
Apr 15, 4:08 PM CDT	Severe Thunderstorm Warning	LSX	Adams	18 min
Apr 15, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Pike	48 min
Apr 15, 4:13 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	47 min
Apr 15, 4:21 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	39 min
Apr 15, 4:43 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	47 min
Apr 15, 4:54 PM CDT	Tornado Warning	LSX	Macoupin	38 min
Apr 15, 4:56 PM CDT	Tornado Warning	LSX	Montgomery	34 min
Apr 15, 5:10 PM CDT	Tornado Warning	LSX	Madison, Saint Clair	35 min
Apr 15, 5:37 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	38 min
Apr 15, 6:05 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	40 min
Apr 15, 6:42 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	28 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2011 Every severe thunderstorm warning in 2011

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.