Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 478, NWS St. Louis, MO

July 29, 2011Bond County, Clinton County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 29, 2011, 7:08 PM CDT for Bond County, Clinton County, Illinois. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 29, 2011, 7:08 PM CDT (00:08 UTC)
Expired: Jul 29, 2011, 7:38 PM CDT
In force: 30 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bond County, IL, Clinton County, IL

The radar

The St Louis radar (KLSX), 115 km from the middle of the area, began a volume at 00:10 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.1 hours before the alert went out and 190 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: 1826 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 816 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

625 
WUUS53 KLSX 300008
SVRLSX
ILC005-027-300100-
/O.NEW.KLSX.SV.W.0478.110730T0008Z-110730T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
708 PM CDT FRI JUL 29 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL BOND COUNTY IN SOUTH CENTRAL ILLINOIS...
  CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 800 PM CDT

* AT 705 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
  BEAVER CREEK...OR 10 MILES SOUTH OF GREENVILLE...AND MOVING SOUTH
  AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BREESE...CARLYLE...ST. ROSE...BECKEMEYER...GERMANTOWN...
  STOLLETOWN...HUEY...FERRIN...BARTELSO...POSEY AND HOFFMAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3850 8916 3850 8930 3851 8931 3851 8934
      3852 8936 3850 8937 3849 8940 3850 8943
      3849 8944 3848 8954 3879 8960 3886 8938
TIME...MOT...LOC 0008Z 339DEG 16KT 3874 8945
WIND...HAIL 60MPH 1.00IN

$$

BRITT

2 follow-up statements

714 
WWUS53 KLSX 300025
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
725 PM CDT FRI JUL 29 2011

ILC027-300035-
/O.CAN.KLSX.SV.W.0478.000000T0000Z-110730T0100Z/
CLINTON IL-
725 PM CDT FRI JUL 29 2011

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

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

LAT...LON 3874 8943 3874 8944 3874 8956 3875 8959
      3879 8960 3881 8955 3886 8938 3874 8931
TIME...MOT...LOC 0025Z 278DEG 16KT 3879 8931

$$

ILC005-300100-
/O.CON.KLSX.SV.W.0478.000000T0000Z-110730T0100Z/
BOND IL-
725 PM CDT FRI JUL 29 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
BOND COUNTY UNTIL 800 PM CDT...

AT 723 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
TAMALCO...OR 8 MILES SOUTHEAST OF GREENVILLE...MOVING EAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURE'S LEADING KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3874 8943 3874 8944 3874 8956 3875 8959
      3879 8960 3881 8955 3886 8938 3874 8931
TIME...MOT...LOC 0025Z 278DEG 16KT 3879 8931
WIND...HAIL 60MPH 1.00IN

$$

BRITT

838 
WWUS53 KLSX 300038
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
738 PM CDT FRI JUL 29 2011

ILC005-300048-
/O.CAN.KLSX.SV.W.0478.000000T0000Z-110730T0100Z/
BOND IL-
738 PM CDT FRI JUL 29 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL BOND COUNTY IS
CANCELLED...

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

LAT...LON 3874 8943 3874 8944 3874 8956 3875 8959
      3879 8960 3881 8955 3886 8938 3874 8931
TIME...MOT...LOC 0038Z 278DEG 16KT 3878 8924

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 7:30 PM CDT	Areal Flood Advisory	LSX	Fayette	6 hr
Jul 29, 11:17 PM CDT	Flash Flood Warning	LSX	Marion	4 hr
Jul 30, 10:54 AM CDT	River Flood Warning	LSX	Pike	4 days
Jul 30, 10:54 AM CDT	River Flood Warning	LSX	Pike	5 days
Jul 30, 10:54 AM CDT	River Flood Warning	LSX	Calhoun	5 days

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.