Alert archive / Illinois / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 9, NWS St. Louis, MO

February 20, 20144 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 20, 2014, 4:35 PM CST for 4 counties in Illinois. It was in force for 40 min. 1 report 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: Feb 20, 2014, 4:35 PM CST (22:35 UTC)
Expired: Feb 20, 2014, 5:15 PM CST
In force: 40 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, Randolph County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 124 km from the middle of the area, began a volume at 22:36 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
Feb 20, 5:18 PM CST	TSTM WND DMG	Kinmundy, IL	POWER LINES DOWN NEAR KINMUNDY

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
Feb 20, 1:36 PM CST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.6 hours before the alert went out and 217 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: 507 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 582 m²/s²
0-3 km storm-relative helicity: 576 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.

553 
WUUS53 KLSX 202235
SVRLSX
ILC027-121-157-189-202315-
/O.NEW.KLSX.SV.W.0009.140220T2235Z-140220T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
435 PM CST THU FEB 20 2014

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 515 PM CST

* AT 433 PM CST...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM TAMALCO TO CHESTER...AND MOVING EAST AT 65 MPH.

  HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.

  SOURCE...TRAINED WEATHER SPOTTERS. ONE INCH HAIL WAS REPORTED      
           2 MILES SOUTHWEST OF SPARTA.

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
           ROOFS...SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE...
  NASHVILLE...CENTRALIA...SALEM...STEELEVILLE...PERCY...PATOKA...
  FAIRMAN...SANDOVAL...CENTRAL CITY...WAMAC...IRVINGTON...ODIN...
  ASHLEY...KINMUNDY...OMEGA...STEPHEN FORBES STATION...HELM...
  COVINGTON...OAKDALE AND POSEY.

THIS WARNING ALSO INCLUDES...
INTERSTATE 57 FROM EXIT 109 TO EXIT 127.
INTERSTATE 64 IN ILLINOIS NEAR EXIT 61.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3847 8914 3822 8914 3822 8959 3795 8959
      3781 8967 3785 8979 3789 8982 3790 8986
      3853 8954 3859 8918 3883 8913 3883 8869
      3848 8869
TIME...MOT...LOC 2235Z 250DEG 56KT 3878 8930 3793 8973

HAIL...1.00IN
WIND...60MPH

$$

KANOFSKY

2 follow-up statements

852 
WWUS53 KLSX 202251
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
451 PM CST THU FEB 20 2014

ILC157-202301-
/O.CAN.KLSX.SV.W.0009.000000T0000Z-140220T2315Z/
RANDOLPH IL-
451 PM CST THU FEB 20 2014

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN RANDOLPH COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA.

LAT...LON 3847 8914 3822 8914 3822 8956 3855 8944
      3859 8918 3876 8913 3883 8913 3883 8869
      3848 8869
TIME...MOT...LOC 2251Z 250DEG 56KT 3886 8900 3801 8943

$$

ILC027-121-189-202315-
/O.CON.KLSX.SV.W.0009.000000T0000Z-140220T2315Z/
MARION IL-WASHINGTON IL-CLINTON IL-
451 PM CST THU FEB 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
CLINTON...WASHINGTON AND MARION COUNTIES UNTIL 515 PM CST...

AT 449 PM CST...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM SHOBONIER TO 7 MILES EAST OF WILLISVILLE...AND MOVING
EAST AT 65 MPH.

HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
         ROOFS...SIDING AND TREES.

LOCATIONS IMPACTED INCLUDE...
CENTRALIA...SALEM...CENTRAL CITY...WAMAC...IRVINGTON...ODIN...
ASHLEY...KINMUNDY...OMEGA...STEPHEN FORBES STATION...HELM...JUNCTION
CITY...RICHVIEW...RADOM...DU BOIS...TONTI...SELMAVILLE...WALNUT
HILL...ALMA AND BRUBAKER.

THIS WARNING ALSO INCLUDES...
INTERSTATE 57 FROM EXIT 109 TO EXIT 127.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3847 8914 3822 8914 3822 8956 3855 8944
      3859 8918 3876 8913 3883 8913 3883 8869
      3848 8869
TIME...MOT...LOC 2251Z 250DEG 56KT 3886 8900 3801 8943

HAIL...1.00IN
WIND...60MPH

$$

KANOFSKY

946 
WWUS53 KLSX 202310
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
510 PM CST THU FEB 20 2014

ILC027-121-189-202320-
/O.EXP.KLSX.SV.W.0009.000000T0000Z-140220T2315Z/
MARION IL-WASHINGTON IL-CLINTON IL-
510 PM CST THU FEB 20 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CLINTON...
WASHINGTON AND MARION COUNTIES IS BEING REISSUED...

PLEASE REFER TO THAT BULLETIN FOR THE LATEST SEVERE WEATHER
INFORMATION.

LAT...LON 3847 8914 3822 8914 3822 8956 3855 8944
      3859 8918 3876 8913 3883 8913 3883 8869
      3848 8869
TIME...MOT...LOC 2310Z 250DEG 56KT 3896 8864 3811 8908

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 4:22 AM CST	Wind Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	20 hr
Feb 20, 1:44 PM CST	Severe Thunderstorm Warning	LSX	Adams, Pike	46 min
Feb 20, 2:25 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	35 min
Feb 20, 2:58 PM CST	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin, Montgomery	47 min
Feb 20, 3:25 PM CST	Severe Thunderstorm Warning	LSX	Bond, Macoupin, Madison	50 min
Feb 20, 3:42 PM CST	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	48 min
Feb 20, 3:55 PM CST	Severe Thunderstorm Warning	LSX	Bond, Fayette	50 min
Feb 20, 4:01 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	44 min
Feb 20, 4:10 PM CST	Tornado Warning	LSX	Fayette, Montgomery	20 min
Feb 20, 4:23 PM CST	Severe Thunderstorm Warning	LSX	Fayette	52 min
Feb 20, 4:40 PM CST	Tornado Warning	LSX	Fayette	35 min
Feb 20, 5:09 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion, Washington	51 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2014 Every severe thunderstorm warning in 2014

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.