Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 460, NWS St. Louis, MO

July 12, 20115 counties in Illinois; Lincoln County, Pike County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 12, 2011, 4:31 PM CDT for 5 counties in Illinois; Lincoln County, Pike County, Missouri. It was in force for 44 min. 3 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 12, 2011, 4:31 PM CDT (21:31 UTC)
Expired
Jul 12, 2011, 5:15 PM CDT
In force
44 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Brown County, IL, Calhoun County, IL, Greene County, IL, Jersey County, IL, Pike County, IL, Lincoln County, MO, Pike County, MO

The radar

The St Louis radar (KLSX), 67 km from the middle of the area, began a volume at 21:33 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 12, 4:43 PM CDTHAIL 0.7Pittsfield, IL
Jul 12, 4:47 PM CDTTSTM WND DMGLouisiana, MONUMEROUS WIRES DOWN CAUSING POWER OUTAGES.
Jul 12, 4:57 PM CDTHAIL 0.253 Nw Hillview, IL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 12, 1:45 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.5 hours before the alert went out and 205 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 2011-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1615 joules per kilogram.LCLLFCEL10008507005003002001001 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 2011-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.193958Sfc1 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
1615 J/kg
Mixed-layer CIN
-167 J/kg
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
-14 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.

249 
WUUS53 KLSX 122131
SVRLSX
ILC009-013-061-083-149-MOC113-163-122215-
/O.NEW.KLSX.SV.W.0460.110712T2131Z-110712T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
431 PM CDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL BROWN COUNTY IN WEST CENTRAL ILLINOIS...
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
  WEST CENTRAL JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  EASTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...
  LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  PIKE COUNTY IN NORTHEAST MISSOURI...

* UNTIL 515 PM CDT

* AT 429 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 6 MILES SOUTHEAST OF BUCKHORN TO ATLAS TO BOWLING GREEN...AND
  MOVING SOUTHEAST AT 40 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY
  THESE DAMAGING WINDS.

  WIND DAMAGE HAS BEEN REPORTED IN HANNIBAL AND BOWLING GREEN WITH   
  THESE STORMS.

* LOCATIONS IMPACTED INCLUDE...
  PITTSFIELD...ELSBERRY...TROY...WHITE HALL...PLEASANT HILL...
  GRIGGSVILLE...CLARKSVILLE...EOLIA...BELLEVIEW...DAVIS...HARDIN...
  MOSCOW MILLS...ROODHOUSE...WINFIELD...CARROLLTON...MARTINSBURG...
  PERRY...CYRENE...INDEPENDENCE AND CHAMBERSBURG.

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 4001 9082 3980 9059 3969 9064 3958 9058
      3953 9058 3952 9028 3909 9042 3893 9067
      3894 9069 3891 9069 3891 9073 3893 9073
      3892 9079 3888 9082 3889 9093 3930 9139
      3958 9096
TIME...MOT...LOC 2131Z 319DEG 34KT 3984 9076 3950 9087
          3928 9121
WIND...HAIL 60MPH 0.75IN

$$

KANOFSKY

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 2:25 PM CDTSevere Thunderstorm WarningLSXMadison, Saint Clair26 min
Jul 12, 2:31 PM CDTFlash Flood WarningLSXMadison, Saint Clair3 hr
Jul 12, 3:20 PM CDTAreal Flood AdvisoryLSXAdams102 min
Jul 12, 3:23 PM CDTAreal Flood AdvisoryLSXMarion, Washington3 hr
Jul 12, 3:38 PM CDTSevere Thunderstorm WarningLSXAdams, Brown52 min
Jul 12, 3:44 PM CDTSevere Thunderstorm WarningLSXAdams, Pike46 min
Jul 12, 4:06 PM CDTFlash Flood WarningLSXMarion3 hr
Jul 12, 4:18 PM CDTSevere Thunderstorm WarningLSXMarion27 min
Jul 12, 4:44 PM CDTTornado WarningLSXGreene, Macoupin, Pike46 min
Jul 12, 4:48 PM CDTSevere Thunderstorm WarningLSXMarion42 min
Jul 12, 5:03 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey, Macoupin, Madison, Montgomery and 1 more57 min
Jul 12, 5:10 PM CDTSevere Thunderstorm WarningLSXFayette, Montgomery30 min
Jul 12, 5:51 PM CDTSevere Thunderstorm WarningLSXBond, Fayette, Marion39 min
Jul 12, 6:53 PM CDTAreal Flood WarningLSXMarion4 hr
Jul 12, 1:58 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis47 min
Jul 12, 2:08 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis, Shelby52 min
Jul 12, 2:36 PM CDTFlash Flood WarningLSXKnox2 hr
Jul 12, 2:54 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis, Marion, Shelby51 min
Jul 12, 4:09 PM CDTSevere Thunderstorm WarningLSXMadison40 min
Jul 12, 4:21 PM CDTAreal Flood AdvisoryLSXSaint Louis, City of Saint Louis42 min
Jul 12, 4:21 PM CDTSevere Thunderstorm WarningLSXCallaway39 min
Jul 12, 4:45 PM CDTSevere Thunderstorm WarningLSXCallaway, Osage45 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2011Severe Thunderstorm Warnings in Missouri, 2011Every severe thunderstorm warning in 2011

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.