Alert archive / Illinois / Tornado Warnings in 2015

Tornado Warning 39, NWS Chicago, IL

December 23, 2015Ford County, Iroquois County, Livingston County, Illinois

NWS Chicago, IL issued this tornado warning at Dec 23, 2015, 10:50 AM CST for Ford County, Iroquois County, Livingston County, Illinois. It was in force for 25 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: Dec 23, 2015, 10:50 AM CST (16:50 UTC)
Expired: Dec 23, 2015, 11:15 AM CST
In force: 25 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Ford County, IL, Iroquois County, IL, Livingston County, IL

The radar

The Chicago radar (KLOT), 101 km from the middle of the area, began a volume at 16:53 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

Time	Report	Where	Remark
Dec 23, 10:58 AM CST	TSTM WND GST 50	Piper City, IL	TIME ESTIMATED.

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 12:00Z, 4.8 hours before the alert went out and 69 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: 12 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 465 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 260 m²/s²
0-3 km storm-relative helicity: 212 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.

815 
WFUS53 KLOT 231650
TORLOT
ILC053-075-105-231715-
/O.NEW.KLOT.TO.W.0039.151223T1650Z-151223T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1050 AM CST WED DEC 23 2015

THE NATIONAL WEATHER SERVICE IN CHICAGO  HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN IROQUOIS COUNTY IN EAST CENTRAL ILLINOIS...
  CENTRAL FORD COUNTY IN EAST CENTRAL ILLINOIS...
  SOUTHEASTERN LIVINGSTON COUNTY IN CENTRAL ILLINOIS...

* UNTIL 1115 AM CST
    
* AT 1050 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 9 MILES SOUTH OF CHATSWORTH...OR 9 MILES SOUTH
  OF PIPER CITY...MOVING NORTHEAST AT 60 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* THIS DANGEROUS STORM WILL BE NEAR...
  CHATSWORTH AROUND 1055 AM CST.
  PIPER CITY AROUND 1100 AM CST.
  GILMAN AND ONARGA AROUND 1105 AM CST.
  ASHKUM AROUND 1115 AM CST.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
MELVIN...DANFORTH...ROBERTS...THAWVILLE AND KEMPTON.

INCLUDING THE FOLLOWING INTERSTATE...
 I-57 BETWEEN MILE MARKERS 277 AND 293.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4059 8837 4098 8822 4085 8786 4048 8821
TIME...MOT...LOC 1650Z 211DEG 52KT 4062 8825 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

BMD

3 follow-up statements

326 
WWUS53 KLOT 231659
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1059 AM CST WED DEC 23 2015

ILC105-231708-
/O.CAN.KLOT.TO.W.0039.000000T0000Z-151223T1715Z/
LIVINGSTON IL-
1059 AM CST WED DEC 23 2015

...THE TORNADO WARNING FOR SOUTHEASTERN LIVINGSTON COUNTY IS
CANCELLED...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4066 8824 4069 8824 4098 8822 4085 8786
      4062 8814
TIME...MOT...LOC 1658Z 211DEG 52KT 4072 8817 

$$

ILC053-075-231715-
/O.CON.KLOT.TO.W.0039.000000T0000Z-151223T1715Z/
IROQUOIS IL-FORD IL-
1059 AM CST WED DEC 23 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1115 AM CST FOR
NORTHWESTERN IROQUOIS AND NORTH CENTRAL FORD COUNTIES...
    
AT 1058 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER PIPER CITY...MOVING NORTHEAST AT 60 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE 
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE DAMAGE IS 
         LIKELY. 

LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE THAWVILLE
AND PIPER CITY.

INCLUDING THE FOLLOWING INTERSTATE...
 I-57 BETWEEN MILE MARKERS 280 AND 293.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4066 8824 4069 8824 4098 8822 4085 8786
      4062 8814
TIME...MOT...LOC 1658Z 211DEG 52KT 4072 8817 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

BMD

310 
WWUS53 KLOT 231706
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1106 AM CST WED DEC 23 2015

ILC053-075-231715-
/O.CON.KLOT.TO.W.0039.000000T0000Z-151223T1715Z/
IROQUOIS IL-FORD IL-
1106 AM CST WED DEC 23 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1115 AM CST FOR
NORTHWESTERN IROQUOIS AND NORTH CENTRAL FORD COUNTIES...
    
AT 1105 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR PIPER CITY...MOVING NORTHEAST AT 55 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE 
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE DAMAGE IS 
         LIKELY. 

INCLUDING THE FOLLOWING INTERSTATE... I-57 BETWEEN MILE MARKERS 284
AND 293.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4073 8820 4097 8819 4085 8786 4069 8813
TIME...MOT...LOC 1705Z 212DEG 48KT 4079 8810 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

BMD

669 
WWUS53 KLOT 231714
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1114 AM CST WED DEC 23 2015

ILC053-075-231724-
/O.EXP.KLOT.TO.W.0039.000000T0000Z-151223T1715Z/
IROQUOIS IL-FORD IL-
1114 AM CST WED DEC 23 2015

...THE TORNADO WARNING FOR NORTHWESTERN IROQUOIS AND NORTH CENTRAL
FORD COUNTIES WILL EXPIRE AT 1115 AM CST...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER GUSTY WINDS
ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4073 8820 4097 8819 4085 8786 4069 8813
TIME...MOT...LOC 1712Z 211DEG 52KT 4079 8810 

$$

BMD

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 23, 3:56 AM CST	Gale Warning	LOT		29 hr
Dec 23, 3:56 AM CST	Gale Warning	LOT		35 hr
Dec 23, 3:56 AM CST	Storm Warning	LOT		29 hr
Dec 23, 4:38 AM CST	Marine Dense Fog Advisory	LOT		13 hr
Dec 23, 9:18 AM CST	Special Weather Statement	LOT	Ford, Livingston	42 min
Dec 23, 9:25 AM CST	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	50 min
Dec 23, 10:19 AM CST	River Flood Advisory	LOT	Kane, Kendall	7 days
Dec 23, 10:19 AM CST	River Flood Advisory	LOT	LaSalle	67 hr
Dec 23, 10:19 AM CST	River Flood Advisory	LOT	Will	44 hr
Dec 23, 10:20 AM CST	Special Weather Statement	LOT	Ford	40 min
Dec 23, 11:30 AM CST	Wind Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	16 hr
Dec 23, 11:39 AM CST	Special Marine Warning	LOT		96 min
Dec 23, 12:03 PM CST	Gale Warning	LOT		9 hr
Dec 23, 12:03 PM CST	Gale Warning	LOT		21 hr

Nearby

Tornado Warnings in Illinois, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.