Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 52, NWS Lincoln, IL

April 29, 2012Shelby County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Apr 29, 2012, 8:01 AM CDT for Shelby County, Illinois. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 29, 2012, 8:01 AM CDT (13:01 UTC)
Expired
Apr 29, 2012, 8:45 AM CDT
In force
44 min
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Shelby County, IL

The radar

The Lincoln radar (KILX), 100 km from the middle of the area, began a volume at 13:01 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 1.0 hours before the alert went out and 102 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 2012-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2012-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 square meters per square second.19395878Sfc1 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
1 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
414 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

180 
WUUS53 KILX 291301
SVRILX
ILC173-291345-
/O.NEW.KILX.SV.W.0052.120429T1301Z-120429T1345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
801 AM CDT SUN APR 29 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN SHELBY COUNTY IN CENTRAL ILLINOIS...

* UNTIL 845 AM CDT.

* AT 756 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
  SOUTHEAST OF NOKOMIS...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SHELBYVILLE...TOWER HILL...LAKEWOOD...COWDEN...OCONEE...HERRICK...
  MODE AND CLARKSBURG.

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 3921 8905 3921 8913 3922 8914 3935 8914
      3935 8913 3935 8903 3938 8902 3944 8867
      3922 8868 3921 8904
TIME...MOT...LOC 1301Z 259DEG 27KT 3926 8914
WIND...HAIL 60MPH 1.00IN

$$

AUTEN
2 follow-up statements
785 
WWUS53 KILX 291324
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
824 AM CDT SUN APR 29 2012

ILC173-291345-
/O.CON.KILX.SV.W.0052.000000T0000Z-120429T1345Z/
SHELBY IL-
824 AM CDT SUN APR 29 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL SHELBY
COUNTY UNTIL 845 AM CDT...

AT 819 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 5 MILES
SOUTHWEST OF LAKEWOOD...OR 13 MILES SOUTHWEST OF SHELBYVILLE...MOVING
EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  SHELBYVILLE...LAKEWOOD...COWDEN...MODE AND CLARKSBURG.

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 3922 8868 3921 8903 3938 8902 3944 8867
TIME...MOT...LOC 1324Z 258DEG 26KT 3929 8894
WIND...HAIL 60MPH 1.00IN

$$

AUTEN
482 
WWUS53 KILX 291349
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
849 AM CDT SUN APR 29 2012

ILC173-291359-
/O.EXP.KILX.SV.W.0052.000000T0000Z-120429T1345Z/
SHELBY IL-
849 AM CDT SUN APR 29 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SHELBY 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...HEAVY RAIN AND FREQUENT LIGHTNING IS STILL 
POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3922 8868 3921 8903 3938 8902 3944 8867
TIME...MOT...LOC 1324Z 258DEG 26KT 3929 8894

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 7:23 PM CDTSevere Thunderstorm WarningILXClay52 min
Apr 28, 7:58 PM CDTSevere Thunderstorm WarningILXRichland41 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.