Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 182, NWS St. Louis, MO

July 1, 2012Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 1, 2012, 3:29 PM CDT for Randolph County, Illinois. It was in force for 46 min. 4 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 1, 2012, 3:29 PM CDT (20:29 UTC)
Expired
Jul 1, 2012, 4:15 PM CDT
In force
46 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Randolph County, IL

The radar

The St Louis radar (KLSX), 116 km from the middle of the area, began a volume at 20:30 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
Jul 1, 3:48 PM CDTHAIL 0.75Steeleville, IL
Jul 1, 3:50 PM CDTTSTM WND DMGSteeleville, ILTREE LIMBS BLOWN DOWN IN AROUND TOWN.
Jul 1, 3:51 PM CDTHAIL 0.7Steeleville, IL
Jul 1, 4:00 PM CDTTSTM WND DMGPercy, ILTREE LIMBS BLOWN DOWN AROUND TOWN.

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, 8.5 hours before the alert went out and 269 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 2012-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2061 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 2012-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
2061 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
1957 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
67 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.

007 
WUUS53 KLSX 012029
SVRLSX
ILC157-012115-
/O.NEW.KLSX.SV.W.0182.120701T2029Z-120701T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
329 PM CDT SUN JUL 1 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 415 PM CDT

* AT 326 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR CHESTER...
  AND MOVING NORTHEAST AT 15 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

* LOCATIONS IMPACTED INCLUDE...
  CHESTER...BREMEN...STEELEVILLE...PERCY...ROCKWOOD...ELLIS GROVE...
  NEW PALESTINE...WELGE...BLAIR AND EDEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3785 8965 3781 8970 3784 8974 3785 8979
      3788 8980 3790 8984 3787 8990 3787 8994
      3793 8998 3796 8993 3797 8994 3796 9001
      3807 8985 3815 8959 3795 8959
TIME...MOT...LOC 2029Z 217DEG 13KT 3786 8981

HAIL...1.00IN
WIND...<50 MPH

$$

TILLY
2 follow-up statements
745 
WWUS53 KLSX 012049
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
349 PM CDT SUN JUL 1 2012

ILC157-012115-
/O.CON.KLSX.SV.W.0182.000000T0000Z-120701T2115Z/
RANDOLPH IL-
349 PM CDT SUN JUL 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
RANDOLPH COUNTY UNTIL 415 PM CDT...

AT 347 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR STEELEVILLE...
AND MOVING NORTHEAST AT 20 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

LOCATIONS IMPACTED INCLUDE...
PERCY AND EDEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.

&&

LAT...LON 3785 8965 3781 8970 3784 8974 3785 8979
      3788 8980 3790 8984 3787 8990 3787 8994
      3793 8998 3796 8993 3797 8994 3796 9001
      3807 8985 3815 8959 3795 8959
TIME...MOT...LOC 2049Z 220DEG 16KT 3801 8966

HAIL...1.00IN
WIND...<50 MPH

$$

TILLY
353 
WWUS53 KLSX 012115
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
415 PM CDT SUN JUL 1 2012

ILC157-012125-
/O.EXP.KLSX.SV.W.0182.000000T0000Z-120701T2115Z/
RANDOLPH IL-
415 PM CDT SUN JUL 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN RANDOLPH COUNTY HAS
EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.  HOWEVER SMALL HAIL IS STILL POSSIBLE WITH OTHER STORMS IN THE 
AREA.

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 3785 8965 3781 8970 3784 8974 3785 8979
      3788 8980 3790 8984 3787 8990 3787 8994
      3793 8998 3796 8993 3797 8994 3796 9001
      3807 8985 3815 8959 3795 8959
TIME...MOT...LOC 2115Z 230DEG 17KT 3808 8952

$$

PHILLIPSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 4:28 PM CDTSevere Thunderstorm WarningLSXRandolph, Saint Clair, Washington47 min
Jul 1, 5:47 PM CDTSevere Thunderstorm WarningLSXRandolph20 min
Jul 1, 6:28 PM CDTSevere Thunderstorm WarningLSXRandolph17 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.