Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 64, NWS St. Louis, MO

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

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 15, 2011, 5:37 PM CDT for Clinton County, Marion County, Washington County, Illinois. It was in force for 38 min. 7 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, 5:37 PM CDT (22:37 UTC)
Expired: Apr 15, 2011, 6:15 PM CDT
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, IL, Marion County, IL, Washington County, IL

The radar

The Evansville,IN radar (KVWX), 129 km from the middle of the area, began a volume at 22:38 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, 5:40 PM CDT	HAIL 0.25	Du Bois, IL
Apr 15, 5:57 PM CDT	HAIL 0.25	Richview, IL
Apr 15, 5:58 PM CDT	HAIL 0.7	6 E Hoyleton, IL	AT HIGHWAY 51 AND ERVINGTON...ALSO 50-55 MPH ESTIMATED WINDS.
Apr 15, 6:05 PM CDT	HAIL 0.7	Centralia, IL	ACCOMPANIED BY 45 MPH MEASURED WINDS.
Apr 15, 6:11 PM CDT	TSTM WND GST 54	3 Nw Walnut Hill, IL
Apr 15, 6:12 PM CDT	HAIL 0.25	Centralia, IL
Apr 15, 6:15 PM CDT	TSTM WND DMG	Centralia, IL	5 INCH DIAMTER TREE LIMBS DOWN.

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, 10.6 hours before the alert went out and 202 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.

215 
WUUS53 KLSX 152237
SVRLSX
ILC027-121-189-152315-
/O.NEW.KLSX.SV.W.0064.110415T2237Z-110415T2315Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHWESTERN MARION COUNTY IN SOUTH CENTRAL ILLINOIS...
  EASTERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 615 PM CDT

* AT 534 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
  TAMAROA...OR 9 MILES NORTHEAST OF PINCKNEYVILLE...AND MOVING
  NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NASHVILLE...CENTRALIA...CARLYLE...ASHLEY...IRVINGTON...WAMAC...
  CENTRAL CITY...SHATTUC...POSEN...DU BOIS...RADOM...BEAUCOUP...
  HUEGELY...COVINGTON...NEW MINDEN...RICHVIEW...HOYLETON...POSEY...
  HOFFMAN AND WALNUT HILL.

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 8899 3847 8914 3822 8914 3821 8915
      3821 8945 3823 8950 3866 8943 3856 8894
TIME...MOT...LOC 2237Z 206DEG 38KT 3822 8927
WIND...HAIL 60MPH 1.00IN

$$

GLASS

2 follow-up statements

791 
WWUS53 KLSX 152257
SVSLSX

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

ILC027-121-189-152315-
/O.CON.KLSX.SV.W.0064.000000T0000Z-110415T2315Z/
WASHINGTON IL-CLINTON IL-MARION IL-
557 PM CDT FRI APR 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
MARION...SOUTHEASTERN CLINTON AND NORTHEASTERN WASHINGTON COUNTIES
UNTIL 615 PM CDT...

AT 554 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
IRVINGTON...OR 8 MILES SOUTH OF CENTRALIA...MOVING NORTHEAST AT 45
MPH.

LOCATIONS IMPACTED INCLUDE...
  CENTRALIA...CARLYLE...BECKEMEYER...WAMAC...CENTRAL CITY...
  SHATTUC...POSEY...HOFFMAN...WALNUT HILL...HUEY...FERRIN AND
  JUNCTION CITY.

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 8899 3847 8914 3827 8915 3831 8925
      3839 8947 3866 8943 3856 8894
TIME...MOT...LOC 2257Z 206DEG 38KT 3845 8916
WIND...HAIL 60MPH 1.00IN

$$

GLASS

024 
WWUS53 KLSX 152315
SVSLSX

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

ILC027-121-189-152326-
/O.EXP.KLSX.SV.W.0064.000000T0000Z-110415T2315Z/
WASHINGTON IL-CLINTON IL-MARION IL-
615 PM CDT FRI APR 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MARION...
SOUTHEASTERN CLINTON AND NORTHEASTERN WASHINGTON COUNTIES HAS
EXPIRED...

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

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

LAT...LON 3847 8899 3847 8914 3827 8915 3831 8925
      3839 8947 3866 8943 3856 8894
TIME...MOT...LOC 2257Z 206DEG 38KT 3845 8916

$$

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, 6:05 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	40 min
Apr 15, 6:07 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion	53 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.