Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 191, NWS St. Louis, MO

July 2, 2012Fayette County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 2, 2012, 4:07 PM CDT for Fayette County, Illinois. It was in force for 23 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: Jul 2, 2012, 4:07 PM CDT (21:07 UTC)
Expired: Jul 2, 2012, 4:30 PM CDT
In force: 23 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Fayette County, IL

The radar

The Lincoln radar (KILX), 111 km from the middle of the area, began a volume at 21:10 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.

What was reported inside it

Time	Report	Where	Remark
Jul 2, 4:20 PM CDT	TSTM WND GST 50	3 N Ramsey, IL	1-2 INCH TREE LIMBS DOWN...10 INCH TREE WHICH WAS ROTTEN INSIDE ALSO BLOWN DOWN.

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, 9.1 hours before the alert went out and 113 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: 2475 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1566 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 47 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.

507 
WUUS53 KLSX 022107
SVRLSX
ILC051-022130-
/O.NEW.KLSX.SV.W.0191.120702T2107Z-120702T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
407 PM CDT MON JUL 2 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 430 PM CDT

* AT 403 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR HERRICK...
  AND MOVING NORTHEAST AT 5 MPH.

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

  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...
  MAINLY RURAL AREAS OF EXTREME NORTHERN FAYETTE COUNTY.

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 3913 8899 3918 8915 3922 8914 3922 8894
      3922 8891
TIME...MOT...LOC 2107Z 206DEG 4KT 3920 8906

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

$$

GOSSELIN

1 follow-up statement

413 
WWUS53 KLSX 022131
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
431 PM CDT MON JUL 2 2012

ILC051-022141-
/O.EXP.KLSX.SV.W.0191.000000T0000Z-120702T2130Z/
FAYETTE IL-
431 PM CDT MON JUL 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL FAYETTE COUNTY
HAS EXPIRED...

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

LAT...LON 3913 8899 3918 8915 3922 8914 3922 8894
      3922 8891
TIME...MOT...LOC 2107Z 206DEG 4KT 3920 8906

$$

GOSSELIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 3:35 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	25 min
Jul 2, 3:59 PM CDT	Heat Advisory	LSX	Adams, Brown, Pike	5 days

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.