Alert archive / Illinois / Tornado Warnings in 2010

Tornado Warning 39, NWS St. Louis, MO

April 30, 20104 counties in Illinois

NWS St. Louis, MO issued this tornado warning at Apr 30, 2010, 9:25 PM CDT for 4 counties in Illinois. It was in force for 34 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
Apr 30, 2010, 9:25 PM CDT (02:25 UTC)
Expired
Apr 30, 2010, 9:59 PM CDT
In force
34 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon

Counties Clinton County, IL, Madison County, IL, Saint Clair County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 02:25 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 30, 9:30 PM CDTHAIL 0.25Edwardsville, IL
Apr 30, 9:30 PM CDTHAIL 0.25Glen Carbon, IL
Apr 30, 9:33 PM CDTTSTM WND DMGMaryville, ILPOWER OUTAGES REPORTED IN MARYVILLE
Apr 30, 9:35 PM CDTHAIL 0.25Edwardsville, 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
Apr 30, 9:03 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.4 hours before the alert went out and 209 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 2010-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1090 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 00:00Z on 2010-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 340 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
1090 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
718 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
340 m²/s²
0-3 km storm-relative helicity
345 m²/s²
Significant tornado parameter
1.7
Supercell composite
10.4

Open this sounding in Storm Lab

The text

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

736 
WFUS53 KLSX 010225
TORLSX
ILC027-119-163-189-010315-
/O.NEW.KLSX.TO.W.0039.100501T0225Z-100501T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
925 PM CDT FRI APR 30 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  WEST CENTRAL WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 1015 PM CDT

* AT 920 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING TORNADOES. THERE WERE TWO 
  CIRCULATIONS WITH THIS STORM...ONE NEAR CASEYVILLE AND THE OTHER   
  APPROXIMATELY 3 MILES SOUTH OF BELLEVILLE. THIS DANGEROUS STORM    
  WAS MOVING NORTHEAST AT 50 MPH.

  THIS STORM HAS A HISTORY OF PRODUCING DAMAGING TORNADOES.

* LOCATIONS IMPACTED INCLUDE...
  MASCOUTAH...COLLINSVILLE...PONTOON BEACH...LEBANON...MARYVILLE...
  NEW BADEN...GLEN CARBON...TROY...EDWARDSVILLE...HIGHLAND...NEW
  MEMPHIS...ALBERS...TRENTON...ST. JACOB...AVISTON...MARINE...
  CARPENTER...WORDEN...ALHAMBRA AND LIVINGSTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 3828 8991 3831 8992 3831 9003 3833 9003
      3835 9006 3861 9019 3866 9018 3900 8984
      3899 8965 3887 8964 3887 8962 3831 8956
TIME...MOT...LOC 0224Z 226DEG 43KT 3866 9001

$$

KANOFSKY
2 follow-up statements
335 
WWUS53 KLSX 010248
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
948 PM CDT FRI APR 30 2010

ILC189-010258-
/O.CAN.KLSX.TO.W.0039.000000T0000Z-100501T0315Z/
WASHINGTON IL-
948 PM CDT FRI APR 30 2010

...THE TORNADO WARNING FOR WEST CENTRAL WASHINGTON COUNTY IS
CANCELLED...

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

LAT...LON 3847 8980 3890 8995 3900 8984 3899 8965
      3887 8964 3887 8962 3881 8961 3851 8958
TIME...MOT...LOC 0248Z 226DEG 43KT 3886 8974

$$

ILC027-119-163-010315-
/O.CON.KLSX.TO.W.0039.000000T0000Z-100501T0315Z/
ST. CLAIR IL-CLINTON IL-MADISON IL-
948 PM CDT FRI APR 30 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR EASTERN MADISON...WESTERN
CLINTON AND NORTHEASTERN ST. CLAIR COUNTIES UNTIL 1015 PM CDT...

AT 943 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR MARINE...OR 8 MILES NORTHEAST OF TROY...MOVING
NORTHEAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  ALHAMBRA...LIVINGSTON...GRANTFORK...WILLIAMSON AND NEW DOUGLAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 3847 8980 3890 8995 3900 8984 3899 8965
      3887 8964 3887 8962 3881 8961 3851 8958
TIME...MOT...LOC 0248Z 226DEG 43KT 3886 8974

$$

KANOFSKY
590 
WWUS53 KLSX 010259
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
959 PM CDT FRI APR 30 2010

ILC027-119-163-010310-
/O.CAN.KLSX.TO.W.0039.000000T0000Z-100501T0315Z/
ST. CLAIR IL-CLINTON IL-MADISON IL-
959 PM CDT FRI APR 30 2010

...THE TORNADO WARNING FOR EASTERN MADISON...WESTERN CLINTON AND
NORTHEASTERN ST. CLAIR COUNTIES IS CANCELLED...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 3 AM CDT.

LAT...LON 3847 8980 3890 8995 3900 8984 3899 8965
      3887 8964 3887 8962 3881 8961 3851 8958
TIME...MOT...LOC 0300Z 226DEG 43KT 3896 8961

$$

KANOFSKY

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 8:21 PM CDTTornado WarningLSXMonroe39 min
Apr 30, 8:54 PM CDTTornado WarningLSXMadison, Monroe, Saint Clair51 min
Apr 30, 9:02 PM CDTTornado WarningLSXMonroe, Randolph29 min
Apr 30, 9:51 PM CDTTornado WarningLSXRandolph39 min
May 1, 3:54 AM CDTFlash Flood WatchLSXBond, Clinton, Fayette, Marion, Monroe, Randolph and 2 more23 hr

Nearby

Tornado Warnings in Illinois, 2010Every tornado warning in 2010Tornadoes in 2010

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.