Alert archive / Illinois / Tornado Warnings in 2012

Tornado Warning 12, NWS Chicago, IL

December 3, 2012Ogle County, Illinois

NWS Chicago, IL issued this tornado warning at Dec 3, 2012, 5:02 PM CST for Ogle County, Illinois. It was in force for 28 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: Dec 3, 2012, 5:02 PM CST (23:02 UTC)
Expired: Dec 3, 2012, 5:30 PM CST
In force: 28 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon

County Ogle County, IL

The radar

The Quad Cities radar (KDVN), 115 km from the middle of the area, began a volume at 23:03 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

Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 109 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 763 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 146 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.

960 
WFUS53 KLOT 032302
TORLOT
ILC141-032330-
/O.NEW.KLOT.TO.W.0012.121203T2302Z-121203T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
502 PM CST MON DEC 3 2012

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARNING FOR...
  OGLE COUNTY...

* UNTIL 530 PM CST

* AT 500 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR POLO...OR 7 MILES SOUTHWEST OF MOUNT
  MORRIS...AND MOVING NORTHEAST AT 45 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  MOUNT MORRIS AROUND 510 PM.
  BYRON AROUND 520 PM.

OTHER LOCATIONS IMPACTED...
OGLE COUNTY FAIRGROUNDS...WHITE PINES STATE PARK...


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 4221 8945 4220 8917 4217 8917 4209 8918
      4195 8953 4198 8960
TIME...MOT...LOC 2302Z 231DEG 41KT 4200 8952

$$

FRIEDLEIN

3 follow-up statements

413 
WWUS53 KLOT 032311
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
511 PM CST MON DEC 3 2012

ILC141-032330-
/O.CON.KLOT.TO.W.0012.000000T0000Z-121203T2330Z/
OGLE IL-
511 PM CST MON DEC 3 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL OGLE COUNTY UNTIL
530 PM CST...

AT 510 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR MOUNT MORRIS...MOVING NORTHEAST AT 40 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  BYRON AROUND 525 PM CST.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST
RESORT... EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR
VEHICLE AND LIE DOWN IN A LOW LYING AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN CHICAGO.

&&

LAT...LON 4220 8939 4220 8917 4209 8918 4198 8946
      4204 8953
TIME...MOT...LOC 2311Z 237DEG 37KT 4204 8942

$$

FRIEDLEIN

942 
WWUS53 KLOT 032321
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
521 PM CST MON DEC 3 2012

ILC141-032330-
/O.CON.KLOT.TO.W.0012.000000T0000Z-121203T2330Z/
OGLE IL-
521 PM CST MON DEC 3 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL OGLE COUNTY UNTIL
530 PM CST...

AT 520 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR OREGON...MOVING NORTHEAST AT 40 MPH. THIS 
STORM HAS SHOWN A GRADUAL WEAKENING TREND IN THE PAST TEN MINUTES.

THIS DANGEROUS STORM WILL BE NEAR...
  BYRON AROUND 525 PM CST.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST
RESORT... EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR
VEHICLE AND LIE DOWN IN A LOW LYING AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN CHICAGO.

&&

LAT...LON 4207 8942 4218 8932 4217 8920 4209 8918
      4201 8937
TIME...MOT...LOC 2320Z 237DEG 37KT 4209 8932

$$

FRIEDLEIN

955 
WWUS53 KLOT 032329
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
529 PM CST MON DEC 3 2012

ILC141-032339-
/O.EXP.KLOT.TO.W.0012.000000T0000Z-121203T2330Z/
OGLE IL-
529 PM CST MON DEC 3 2012

...THE TORNADO WARNING FOR CENTRAL OGLE COUNTY WILL EXPIRE AT 530 PM
CST...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED. MINOR ROTATION IS 
STILL PRESENT IN THIS STORM...AND WIND GUSTS EXCEEDING 40 MPH ARE 
POSSIBLE AS THE STORM MOVES NORTH OF BYRON AND TOWARD ROCKFORD.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN CHICAGO.

LAT...LON 4207 8942 4218 8932 4217 8920 4209 8918
      4201 8937
TIME...MOT...LOC 2329Z 237DEG 37KT 4213 8921

$$

FRIEDLEIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 2, 7:01 PM CST	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	13 hr
Dec 3, 2:50 AM CST	Marine Dense Fog Advisory	LOT		18 hr
Dec 3, 12:06 PM CST	Marine Dense Fog Advisory	LOT		11 hr
Dec 3, 4:45 PM CST	Special Weather Statement	LOT	Ogle, Winnebago	45 min
Dec 3, 5:28 PM CST	Special Weather Statement	LOT	Boone, Winnebago	47 min

Nearby

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