Alert archive / Illinois / Tornado Warnings in 2012

Tornado Warning 10, NWS Chicago, IL

October 14, 20124 counties in Illinois

NWS Chicago, IL issued this tornado warning at Oct 14, 2012, 1:43 PM CDT for 4 counties in Illinois. It was in force for 32 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 14, 2012, 1:43 PM CDT (18:43 UTC)
Expired
Oct 14, 2012, 2:15 PM CDT
In force
32 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon

Counties DeKalb County, IL, Kane County, IL, Kendall County, IL, LaSalle County, IL

The radar

The Chicago radar (KLOT), 33 km from the middle of the area, began a volume at 18:47 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, 6.7 hours before the alert went out and 166 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 2012-10-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 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 2012-10-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 197 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
11 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
938 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
197 m²/s²
0-3 km storm-relative helicity
246 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.

072 
WFUS53 KLOT 141843
TORLOT
ILC037-089-093-099-141915-
/O.NEW.KLOT.TO.W.0010.121014T1843Z-121014T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
143 PM CDT SUN OCT 14 2012

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN DE KALB COUNTY...
  SOUTHERN KANE COUNTY...
  WESTERN KENDALL COUNTY...
  NORTHEASTERN LA SALLE COUNTY...

* UNTIL 215 PM CDT

* AT 142 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR NEWARK...OR 6 MILES SOUTH OF SANDWICH...AND
  MOVING NORTHEAST AT 45 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  SANDWICH AROUND 150 PM.
  PLANO...LITTLE ROCK AND YORKVILLE AROUND 155 PM.
  SUGAR GROVE AND MONTGOMERY AROUND 205 PM.
  AURORA AROUND 210 PM.
  NORTH AURORA AND ELBURN AROUND 215 PM.

OTHER LOCATIONS IMPACTED...
AURORA UNIVERSITY...IL MATH AND SCIENCE ACADEMY...SANDWICH
FAIRGROUNDS...WAUBONSEE COMMUNITY COLLEGE...

I-88 BETWEEN MILE MARKERS 104 AND 118.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4176 8826 4175 8826 4145 8859 4145 8860
      4144 8860 4156 8882 4194 8848
TIME...MOT...LOC 1843Z 215DEG 38KT 4157 8863

$$

ENDERLEN
2 follow-up statements
046 
WWUS53 KLOT 141854
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
154 PM CDT SUN OCT 14 2012

ILC037-089-093-099-141915-
/O.CON.KLOT.TO.W.0010.000000T0000Z-121014T1915Z/
KANE IL-KENDALL IL-LA SALLE IL-DE KALB IL-
154 PM CDT SUN OCT 14 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN DE KALB...
NORTHEASTERN LA SALLE...WESTERN KENDALL AND SOUTHERN KANE COUNTIES
UNTIL 215 PM CDT...

AT 153 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR PLANO...MOVING NORTHEAST AT 45 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  SUGAR GROVE AND MONTGOMERY AROUND 205 PM CDT.
  AURORA AROUND 210 PM CDT.
  NORTH AURORA AND ELBURN AROUND 215 PM CDT.

OTHER LOCATIONS AFFECTED...
AURORA UNIVERSITY...IL MATH AND SCIENCE ACADEMY...SANDWICH
FAIRGROUNDS...WAUBONSEE COMMUNITY COLLEGE...

THE FOLLOWING INTERSTATES MAY BE IMPACTED...

I-88 BETWEEN MILE MARKERS 104 AND 117.


LAT...LON 4162 8877 4194 8848 4176 8826 4175 8826
      4150 8853
TIME...MOT...LOC 1855Z 215DEG 38KT 4167 8853

$$

ENDERLEN
273 
WWUS53 KLOT 141912
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
212 PM CDT SUN OCT 14 2012

ILC037-089-093-099-141921-
/O.EXP.KLOT.TO.W.0010.000000T0000Z-121014T1915Z/
KANE IL-KENDALL IL-LA SALLE IL-DE KALB IL-
212 PM CDT SUN OCT 14 2012


...THE TORNADO WARNING FOR SOUTHEASTERN DE KALB...NORTHEASTERN LA
SALLE...WESTERN KENDALL AND SOUTHERN KANE COUNTIES WILL EXPIRE AT 215
PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH
THIS THUNDERSTORM.

LAT...LON 4162 8877 4194 8848 4176 8826 4175 8826
      4150 8853
TIME...MOT...LOC 1911Z 215DEG 38KT 4181 8840

$$

BIRK

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 14, 12:59 PM CDTSevere Thunderstorm WarningLOTDeKalb, Grundy, Kendall, LaSalle61 min
Oct 14, 1:19 PM CDTSpecial Weather StatementLOTCook26 min
Oct 14, 1:32 PM CDTSpecial Weather StatementLOTKane, Lake, McHenry58 min
Oct 14, 2:19 PM CDTTornado WarningLOTCook, DuPage19 min
Oct 14, 3:03 PM CDTSpecial Weather StatementLOTFord, Kankakee, Will27 min
Oct 14, 3:58 PM CDTSpecial Marine WarningLOT64 min

Nearby

Tornado Warnings in Illinois, 2012Every tornado warning in 2012Tornadoes 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.