Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 36, NWS St. Louis, MO

April 9, 2011Macoupin County, Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2011, 5:25 AM CDT for Macoupin County, Madison County, Illinois. It was in force for 35 min. 1 report 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
Apr 9, 2011, 5:25 AM CDT (10:25 UTC)
Expired
Apr 9, 2011, 6:00 AM CDT
In force
35 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Macoupin County, IL, Madison County, IL

The radar

The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 10:26 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
Apr 9, 5:30 AM CDTHAIL 0.7Bunker Hill, 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 00:00Z, 10.4 hours before the alert went out and 174 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 00:00Z on 2011-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 00:00Z on 2011-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
637 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
242 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.

668 
WUUS53 KLSX 091025
SVRLSX
ILC117-119-091100-
/O.NEW.KLSX.SV.W.0036.110409T1025Z-110409T1100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
525 AM CDT SAT APR 9 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
  NORTHERN MADISON COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 600 AM CDT

* AT 521 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR BETHALTO...AND MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  STAUNTON...DORSEY...CARPENTER...PRAIRIETOWN...BUNKER HILL...
  WORDEN...WILSONVILLE...LIVINGSTON...BENLD...MOUNT OLIVE...HAMEL...
  PRUETT...DORCHESTER...WILLIAMSON AND WHITE CITY.

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 3884 9012 3900 9016 3900 9015 3905 9015
      3913 8971 3900 8970 3900 8968 3891 8968
TIME...MOT...LOC 1025Z 250DEG 31KT 3894 9004
WIND...HAIL <50MPH 1.00IN

$$

TES
1 follow-up statement
149 
WWUS53 KLSX 091100 RRA
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
600 AM CDT SAT APR 9 2011

ILC117-119-091111-
/O.EXP.KLSX.SV.W.0036.000000T0000Z-110409T1100Z/
MADISON IL-MACOUPIN IL-
600 AM CDT SAT APR 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MACOUPIN AND NORTHERN
MADISON COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.

LAT...LON 3884 9012 3900 9016 3900 9015 3905 9015
      3913 8971 3900 8970 3900 8968 3891 8968
TIME...MOT...LOC 1025Z 250DEG 31KT 3894 9004

$$

TES

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 2:46 AM CDTFlash Flood WarningLSXAdams6 hr
Apr 9, 3:00 AM CDTSevere Thunderstorm WarningLSXAdams, Pike33 min
Apr 9, 3:44 AM CDTSevere Thunderstorm WarningLSXCalhoun, Pike31 min
Apr 9, 4:19 AM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey26 min
Apr 9, 5:08 AM CDTSevere Thunderstorm WarningLSXJersey, Madison22 min
Apr 9, 5:21 AM CDTSevere Thunderstorm WarningLSXFayette, Montgomery39 min
Apr 9, 5:41 AM CDTSevere Thunderstorm WarningLSXBond, Madison49 min
Apr 9, 5:44 AM CDTAreal Flood AdvisoryLSXCalhoun, Jersey, Macoupin, Madison3 hr
Apr 9, 6:43 AM CDTSevere Thunderstorm WarningLSXFayette, Marion32 min
Apr 9, 10:42 AM CDTRiver Flood WarningLSXAdams32 days

Nearby

Severe Thunderstorm Warnings in Illinois, 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.