Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 89, NWS Lincoln, IL

August 8, 2012Clay County, Richland County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 8, 2012, 5:22 PM CDT for Clay County, Richland County, Illinois. It was in force for 38 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
Aug 8, 2012, 5:22 PM CDT (22:22 UTC)
Expired
Aug 8, 2012, 6:00 PM CDT
In force
38 min
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Clay County, IL, Richland County, IL

The radar

The Evansville,IN radar (KVWX), 74 km from the middle of the area, began a volume at 22:23 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

TimeReportWhereRemark
Aug 8, 5:33 PM CDTTSTM WND DMGClay City, ILSEVERAL TREE LIMBS AND POWER LINES DOWN.
Aug 8, 5:39 PM CDTTSTM WND GST 50Clay City, 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 12:00Z, 10.4 hours before the alert went out and 160 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2012-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 810 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2012-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
810 J/kg
Mixed-layer CIN
-169 J/kg
Mixed-layer LCL
1967 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
113 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.

103 
WUUS53 KILX 082222
SVRILX
ILC025-159-082300-
/O.NEW.KILX.SV.W.0089.120808T2222Z-120808T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
522 PM CDT WED AUG 8 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CLAY COUNTY IN SOUTH CENTRAL ILLINOIS...
  WEST CENTRAL RICHLAND COUNTY IN SOUTHEAST ILLINOIS...

* UNTIL 600 PM CDT.

* AT 516 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
  TWO SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN 
  EXCESS OF 60 MPH. ONE STORM WAS LOCATED NEAR FLORA...AND THE 
  OTHER WAS 4 MILES NORTHEAST OF CLAY CITY. BOTH STORMS WERE MOVING
  NORTHEAST AT 10 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE
  DAMAGING WINDS.

  AT 520 PM...WIND GUSTS OF 55 TO 60 MPH WERE REPORTED IN FLORA
  BY LOCAL MEDIA.

* LOCATIONS IMPACTED INCLUDE...
  CLAY CITY...SAILOR SPRINGS AND NOBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3880 8825 3867 8818 3864 8846 3871 8851
TIME...MOT...LOC 2221Z 246DEG 8KT 3869 8844
WIND...HAIL 60MPH 0.75IN

$$
GEELHART
2 follow-up statements
744 
WWUS53 KILX 082241
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
541 PM CDT WED AUG 8 2012

ILC025-159-082300-
/O.CON.KILX.SV.W.0089.000000T0000Z-120808T2300Z/
RICHLAND IL-CLAY IL-
541 PM CDT WED AUG 8 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
CLAY AND WEST CENTRAL RICHLAND COUNTIES UNTIL 600 PM CDT...

AT 540 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS
STORM WAS LOCATED NEAR CLAY CITY...MOVING NORTHEAST AT 10 MPH. 
PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

CLAY COUNTY EMERGENCY SERVICES REPORTED DAMAGE IN CLAY CITY FROM
THIS STORM. ALSO...A TREE WAS KNOCKED DOWN IN FLORA FROM THE 
EARLIER STORM.

LOCATIONS IMPACTED INCLUDE...
  CLAY CITY AND NOBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3872 8847 3880 8825 3867 8818 3864 8844
TIME...MOT...LOC 2240Z 246DEG 8KT 3871 8839
WIND...HAIL 60MPH 0.75IN

$$
GEELHART
181 
WWUS53 KILX 082301
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
601 PM CDT WED AUG 8 2012

ILC025-159-082311-
/O.EXP.KILX.SV.W.0089.000000T0000Z-120808T2300Z/
RICHLAND IL-CLAY IL-
601 PM CDT WED AUG 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CLAY AND WEST
CENTRAL RICHLAND COUNTIES 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 HEAVY RAIN WILL CONTINUE WITH THIS STORM...ESPECIALLY BETWEEN 
CLAY CITY AND OLNEY NOBLE AIRPORT. RADAR HAS ESTIMATED 2 TO 3 
INCHES OF RAIN HAD FALLEN SINCE 430 PM...AND AREAS OF MINOR FLOODING
ARE LIKELY.

LAT...LON 3872 8847 3880 8825 3867 8818 3864 8844
TIME...MOT...LOC 2241Z 246DEG 8KT 3871 8839

$$
GEELHART

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 8, 4:35 PM CDTSpecial Weather StatementILXDouglas40 min
Aug 8, 5:32 PM CDTAreal Flood AdvisoryILXClay, Richland3 hr
Aug 8, 6:14 PM CDTFlash Flood WarningILXClay, Richland3 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2012Every 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.