Alert archive / Illinois / Tornado Warnings in 2010

Tornado Warning 68, NWS St. Louis, MO

October 26, 2010Saint Clair County, Illinois

NWS St. Louis, MO issued this tornado warning at Oct 26, 2010, 4:44 AM CDT for Saint Clair County, Illinois. It was in force for 23 min. 2 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
Oct 26, 2010, 4:44 AM CDT (09:44 UTC)
Expired
Oct 26, 2010, 5:07 AM CDT
In force
23 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon

County Saint Clair County, IL

The radar

The St Louis radar (KLSX), 76 km from the middle of the area, began a volume at 09:48 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
Oct 26, 5:00 AM CDTTSTM WND GST 58Freeburg, IL
Oct 26, 5:04 AM CDTTSTM WND GST 46Mascoutah, 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
Oct 25, 10:03 PM CDTTornado WatchSPC9 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 9.7 hours before the alert went out and 363 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, Davenport, at 00:00Z on 2010-10-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 158 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, Davenport, at 00:00Z on 2010-10-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 357 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
158 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
857 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
357 m²/s²
0-3 km storm-relative helicity
405 m²/s²
Significant tornado parameter
0.1
Supercell composite
3.9

Open this sounding in Storm Lab

The text

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

438 
WFUS53 KLSX 260944
TORLSX
ILC163-261015-
/O.NEW.KLSX.TO.W.0068.101026T0944Z-101026T1015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
444 AM CDT TUE OCT 26 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 515 AM CDT

* AT 443 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR WATERLOO...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FREEBURG...MASCOUTAH...SMITHTON...FLORAVILLE...PADERBORN...
  FAYETTEVILLE AND ST. LIBORY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA.

&&

LAT...LON 3834 8971 3831 8999 3831 9003 3833 9003
      3836 9008 3841 9013 3859 8971 3849 8971
TIME...MOT...LOC 0945Z 248DEG 40KT 3834 9006

$$

BROWNING
2 follow-up statements
365 
WWUS53 KLSX 260955
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
455 AM CDT TUE OCT 26 2010

ILC163-261015-
/O.CON.KLSX.TO.W.0068.000000T0000Z-101026T1015Z/
ST. CLAIR IL-
455 AM CDT TUE OCT 26 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN ST. CLAIR COUNTY
UNTIL 515 AM CDT...

AT 452 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR FREEBURG...MOVING EAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  MASCOUTAH...FAYETTEVILLE AND ST. LIBORY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 3834 8971 3831 8999 3831 9003 3833 9003
      3836 9008 3841 9013 3859 8971 3849 8971
TIME...MOT...LOC 0955Z 248DEG 50KT 3840 8987

$$

BROWNING
693 
WWUS53 KLSX 261007
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
507 AM CDT TUE OCT 26 2010

ILC163-261016-
/O.CAN.KLSX.TO.W.0068.000000T0000Z-101026T1015Z/
ST. CLAIR IL-
507 AM CDT TUE OCT 26 2010

...THE TORNADO WARNING FOR SOUTHERN ST. CLAIR COUNTY IS CANCELLED...

THE CIRCULATION WHICH PROMPTED THE WARNING HAS WEAKENED...HOWEVER A 
SEVERE THUNDERSTORM WARNING IS STILL IN EFFECT.

LAT...LON 3834 8971 3831 8999 3831 9003 3833 9003
      3836 9008 3841 9013 3859 8971 3849 8971
TIME...MOT...LOC 1006Z 239DEG 59KT 3849 8972

$$

BROWNING

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 26, 12:56 AM CDTSevere Thunderstorm WarningLSXAdams31 min
Oct 26, 1:13 AM CDTSevere Thunderstorm WarningLSXAdams, Pike47 min
Oct 26, 1:19 AM CDTTornado WarningLSXAdams, Brown, Pike41 min
Oct 26, 1:39 AM CDTSevere Thunderstorm WarningLSXAdams51 min
Oct 26, 1:56 AM CDTTornado WarningLSXBrown19 min
Oct 26, 3:34 AM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey41 min
Oct 26, 3:34 AM CDTTornado WarningLSXCalhoun, Greene, Jersey, Pike41 min
Oct 26, 4:09 AM CDTSevere Thunderstorm WarningLSXGreene, Jersey, Macoupin, Madison, Monroe, Randolph and 1 more66 min
Oct 26, 4:33 AM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Macoupin, Madison, Marion and 2 more57 min
Oct 26, 5:15 AM CDTTornado WarningLSXBond, Clinton, Fayette, Montgomery30 min
Oct 26, 5:19 AM CDTSevere Thunderstorm WarningLSXRandolph23 min
Oct 26, 5:30 AM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Marion, Montgomery, Washington45 min
Oct 26, 5:54 AM CDTTornado WarningLSXFayette21 min
Oct 26, 6:03 AM CDTTornado WarningLSXMarion17 min

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.