Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 215, NWS St. Louis, MO

July 8, 2012Monroe County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 8, 2012, 5:44 PM CDT for Monroe County, Illinois. It was in force for 46 min. 2 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: Jul 8, 2012, 5:44 PM CDT (22:44 UTC)
Expired: Jul 8, 2012, 6:30 PM CDT
In force: 46 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Monroe County, IL

The radar

The St Louis radar (KLSX), 63 km from the middle of the area, began a volume at 22:44 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
Jul 8, 5:59 PM CDT	HAIL 0.7	New Handover, IL
Jul 8, 6:23 PM CDT	TSTM WND DMG	Waterloo, IL	TREES DOWN IN WATERLOO ON THE 400 BLOCK OF WEST MILL ROAD. TIME ESTIMATED FROM RADAR. REPORT RELAYED BY LOCAL MEDIA.

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 12:00Z, 10.7 hours before the alert went out and 248 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: 588 J/kg
Mixed-layer CIN: -359 J/kg
Mixed-layer LCL: 1252 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

933 
WUUS53 KLSX 082244
SVRLSX
ILC133-082330-
/O.NEW.KLSX.SV.W.0215.120708T2244Z-120708T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
544 PM CDT SUN JUL 8 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONROE COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 630 PM CDT

* AT 538 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WATERLOO...
  AND MOVING SOUTH AT 15 MPH.

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

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
           DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.

* LOCATIONS IMPACTED INCLUDE...
  VALMEYER...NEW DESIGN...FOSTER POND...WARTBURG...HARRISONVILLE...
  BURKSVILLE...MADONNAVILLE...MONROE CITY...MAEYSTOWN...CHALFIN
  BRIDGE...FULTS...RENAULT...KIDD AND AMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3822 9004 3815 9004 3811 9013 3809 9019
      3824 9037 3831 9037 3842 9031 3845 9028
      3846 9028 3851 9026 3832 9005 3822 9002
TIME...MOT...LOC 2245Z 002DEG 12KT 3833 9021

HAIL...0.75IN
WIND...60 MPH

$$

TES

2 follow-up statements

385 
WWUS53 KLSX 082308
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
608 PM CDT SUN JUL 8 2012

ILC133-082330-
/O.CON.KLSX.SV.W.0215.000000T0000Z-120708T2330Z/
MONROE IL-
608 PM CDT SUN JUL 8 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MONROE COUNTY
UNTIL 630 PM CDT...

AT 606 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR NEW DESIGN...
AND MOVING SOUTHEAST AT 20 MPH.

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

SOURCE...RADAR INDICATED.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
         DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.

LOCATIONS IMPACTED INCLUDE...
RENAULT...KIDD AND AMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3822 9004 3815 9004 3811 9013 3809 9019
      3824 9037 3831 9037 3842 9031 3845 9028
      3846 9028 3851 9026 3832 9005 3822 9002
TIME...MOT...LOC 2308Z 332DEG 18KT 3820 9012

HAIL...0.75IN
WIND...60 MPH

$$

TES

765 
WWUS53 KLSX 082329
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
629 PM CDT SUN JUL 8 2012

ILC133-082339-
/O.EXP.KLSX.SV.W.0215.000000T0000Z-120708T2330Z/
MONROE IL-
629 PM CDT SUN JUL 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR MONROE COUNTY WILL EXPIRE AT
630 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

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 3822 9004 3815 9004 3811 9013 3809 9019
      3824 9037 3831 9037 3842 9031 3845 9028
      3846 9028 3851 9026 3832 9005 3822 9002
TIME...MOT...LOC 2329Z 332DEG 18KT 3811 9006

$$

TES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 7:06 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	32 min
Jul 7, 7:58 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	47 min
Jul 7, 8:40 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	50 min
Jul 8, 2:29 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion	46 min
Jul 8, 5:03 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	42 min
Jul 8, 5:42 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	48 min
Jul 8, 5:57 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	27 min
Jul 8, 6:49 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	41 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2012 Every severe thunderstorm warning in 2012

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.