Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 38, NWS St. Louis, MO

April 9, 2011Fayette County, Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2011, 6:43 AM CDT for Fayette County, Marion County, Illinois. It was in force for 32 min. 5 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 9, 2011, 6:43 AM CDT (11:43 UTC)
Expired: Apr 9, 2011, 7:15 AM CDT
In force: 32 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Fayette County, IL, Marion County, IL

The radar

The Evansville,IN radar (KVWX), 110 km from the middle of the area, began a volume at 11:47 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 9, 6:47 AM CDT	HAIL 0.25	Sandoval, IL	PEA SIZED HAIL LASTED FOR ABOUT A MINUTE.
Apr 9, 6:55 AM CDT	HAIL 0.25	Salem, IL
Apr 9, 7:02 AM CDT	HAIL 0.25	Salem, IL
Apr 9, 7:04 AM CDT	HAIL 0.25	Salem, IL
Apr 9, 7:06 AM CDT	HAIL 0.7	Salem, IL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 11.7 hours before the alert went out and 164 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: 637 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 242 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.

948 
WUUS53 KLSX 091143
SVRLSX
ILC051-121-091215-
/O.NEW.KLSX.SV.W.0038.110409T1143Z-110409T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
643 AM CDT SAT APR 9 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...
  MARION COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 715 AM CDT

* AT 640 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM SHOBONIER TO CENTRALIA...AND
  MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SALEM...KINMUNDY...FARINA...OMEGA...STEPHEN FORBES STATE PARK...
  HELM...SELMAVILLE...TONTI...ST. PAUL...ALMA...CARTTER...KELL...
  BRUBAKER...ST. PETER...LOOGOOTEE...IUKA AND LA CLEDE.

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.

&&

LAT...LON 3847 8878 3847 8914 3851 8915 3885 8914
      3896 8881 3892 8880 3892 8870 3881 8869
      3848 8870
TIME...MOT...LOC 1143Z 261DEG 32KT 3882 8903 3850 8906
WIND...HAIL 60MPH 1.00IN

$$

BRITT

3 follow-up statements

037 
WWUS53 KLSX 091155
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
655 AM CDT SAT APR 9 2011

ILC051-121-091215-
/O.CON.KLSX.SV.W.0038.000000T0000Z-110409T1215Z/
MARION IL-FAYETTE IL-
655 AM CDT SAT APR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL
FAYETTE AND MARION COUNTIES UNTIL 715 AM CDT...

AT 654 AM 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
SALEM...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  KINMUNDY...HELM...OMEGA...STEPHEN FORBES STATE PARK...FARINA...
  ALMA...ST. PAUL...BRUBAKER...IUKA...ST. PETER...LOOGOOTEE AND LA
  CLEDE.

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.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.

&&

LAT...LON 3847 8878 3847 8910 3885 8904 3896 8881
      3892 8880 3892 8870 3881 8869 3848 8870
TIME...MOT...LOC 1155Z 254DEG 33KT 3862 8890
WIND...HAIL 60MPH 1.00IN

$$

BRITT

148 
WWUS53 KLSX 091204
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
704 AM CDT SAT APR 9 2011

ILC051-091214-
/O.CAN.KLSX.SV.W.0038.000000T0000Z-110409T1215Z/
FAYETTE IL-
704 AM CDT SAT APR 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FAYETTE COUNTY IS
CANCELLED...

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

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.

LAT...LON 3847 8878 3847 8899 3876 8881 3881 8869
      3848 8870
TIME...MOT...LOC 1204Z 251DEG 32KT 3858 8877

$$

ILC121-091215-
/O.CON.KLSX.SV.W.0038.000000T0000Z-110409T1215Z/
MARION IL-
704 AM CDT SAT APR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN MARION
COUNTY UNTIL 715 AM CDT...

AT 703 AM 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 6 MILES
NORTHWEST OF HELM...OR 10 MILES EAST OF SALEM...MOVING EAST AT 35
MPH.

LOCATIONS IMPACTED INCLUDE...
  HELM...OMEGA AND STEPHEN FORBES STATE PARK.

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.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.

&&

LAT...LON 3847 8878 3847 8899 3876 8881 3881 8869
      3848 8870
TIME...MOT...LOC 1204Z 251DEG 32KT 3858 8877
WIND...HAIL 60MPH 1.00IN

$$

BRITT

625 
WWUS53 KLSX 091214
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
714 AM CDT SAT APR 9 2011

ILC121-091224-
/O.EXP.KLSX.SV.W.0038.000000T0000Z-110409T1215Z/
MARION IL-
714 AM CDT SAT APR 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MARION COUNTY WILL
EXPIRE AT 715 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED ACROSS/MOVED OUT 
THE WARNED AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.

LAT...LON 3847 8878 3847 8899 3876 8881 3881 8869
      3848 8870
TIME...MOT...LOC 1214Z 251DEG 32KT 3861 8866

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 2:46 AM CDT	Flash Flood Warning	LSX	Adams	6 hr
Apr 9, 3:00 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	33 min
Apr 9, 3:44 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Pike	31 min
Apr 9, 4:19 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	26 min
Apr 9, 5:08 AM CDT	Severe Thunderstorm Warning	LSX	Jersey, Madison	22 min
Apr 9, 5:21 AM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	39 min
Apr 9, 5:25 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	35 min
Apr 9, 5:41 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Madison	49 min
Apr 9, 5:44 AM CDT	Areal Flood Advisory	LSX	Calhoun, Jersey, Macoupin, Madison	3 hr
Apr 9, 10:42 AM CDT	River Flood Warning	LSX	Adams	32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.