Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 336, NWS St. Louis, MO

October 22, 2012Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Oct 22, 2012, 7:43 AM CDT for Pike County, Illinois. It was in force for 47 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
Oct 22, 2012, 7:43 AM CDT (12:43 UTC)
Expired
Oct 22, 2012, 8:30 AM CDT
In force
47 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Pike County, IL

The radar

The St Louis radar (KLSX), 114 km from the middle of the area, began a volume at 12:46 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, 0.7 hours before the alert went out and 181 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 2012-10-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 620 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 2012-10-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 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
620 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
653 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
276 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.

789 
WUUS53 KLSX 221243
SVRLSX
ILC149-221330-
/O.NEW.KLSX.SV.W.0336.121022T1243Z-121022T1330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
743 AM CDT MON OCT 22 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 830 AM CDT

* AT 738 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  PITTSFIELD...AND MOVING EAST AT 40 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

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

* LOCATIONS IMPACTED INCLUDE...
  GRIGGSVILLE...TIME...PERRY...DETROIT...MILTON...MONTEZUMA...VALLEY
  CITY...FLORENCE AND CHAMBERSBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3983 9056 3979 9059 3975 9061 3972 9064
      3968 9063 3963 9060 3953 9058 3950 9090
      3983 9091 3984 9057
TIME...MOT...LOC 1243Z 252DEG 33KT 3967 9080

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

$$

GLASS
1 follow-up statement
482 
WWUS53 KLSX 221326
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
826 AM CDT MON OCT 22 2012

ILC149-221335-
/O.EXP.KLSX.SV.W.0336.000000T0000Z-121022T1330Z/
PIKE IL-
826 AM CDT MON OCT 22 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PIKE COUNTY IN WEST
CENTRAL ILLINOIS WILL EXPIRE AT 830 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.  HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM.

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 3983 9056 3979 9059 3975 9061 3972 9064
      3968 9063 3963 9060 3953 9058 3950 9090
      3983 9091 3984 9057
TIME...MOT...LOC 1325Z 252DEG 33KT 3979 9032

$$

BRITT

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 22, 6:20 AM CDTSevere Thunderstorm WarningLSXAdams55 min
Oct 22, 6:56 AM CDTSevere Thunderstorm WarningLSXAdams, Pike49 min
Oct 22, 9:30 AM CDTSevere Thunderstorm WarningLSXGreene, Jersey, Macoupin45 min
Oct 22, 10:34 AM CDTSevere Thunderstorm WarningLSXMadison41 min
Oct 22, 11:38 AM CDTSevere Thunderstorm WarningLSXClinton, Madison, Saint Clair37 min
Oct 22, 2:04 PM CDTSevere Thunderstorm WarningLSXMadison, Saint Clair24 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.