Alert archive / Illinois / Tornado Warnings in 2018

Tornado Warning 33, NWS Lincoln, IL

December 1, 2018McLean County, Illinois

NWS Lincoln, IL issued this tornado warning at Dec 1, 2018, 7:47 PM CST for McLean 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 1, 2018, 7:47 PM CST (01:47 UTC)
Expired: Dec 1, 2018, 8:15 PM CST
In force: 28 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

County McLean County, IL

The radar

The Lincoln radar (KILX), 81 km from the middle of the area, began a volume at 01:49 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Dec 1, 2:16 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.8 hours before the alert went out and 56 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: 653 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 392 m²/s²
0-3 km storm-relative helicity: 444 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 6.5

Open this sounding in Storm Lab

The text

As transmitted.

154 
WFUS53 KILX 020147
TORILX
ILC113-020215-
/O.NEW.KILX.TO.W.0033.181202T0147Z-181202T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Lincoln IL
747 PM CST SAT DEC 1 2018

The National Weather Service in Lincoln has issued a

* Tornado Warning for...
  Northeastern McLean County in central Illinois...

* Until 815 PM CST.
    
* At 747 PM CST, a tornado producing storm was located near Colfax,
  or 13 miles southwest of Fairbury, moving north at 30 mph.

  HAZARD...Damaging tornado.

  SOURCE...Radar confirmed tornado.

  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 tornadic thunderstorm will remain over mainly rural areas of
  northeastern McLean County, including the following locations...
  Weston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4063 8858 4056 8864 4057 8873 4076 8870
      4076 8859
TIME...MOT...LOC 0147Z 200DEG 27KT 4059 8867 

TORNADO...OBSERVED
HAIL...<.75IN

$$

Auten

1 follow-up statement

843 
WWUS53 KILX 020213
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
813 PM CST SAT DEC 1 2018

ILC113-020222-
/O.EXP.KILX.TO.W.0033.000000T0000Z-181202T0215Z/
McLean-
813 PM CST SAT DEC 1 2018

...THE TORNADO WARNING FOR NORTHEASTERN MCLEAN COUNTY WILL EXPIRE AT
815 PM CST...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Tornado Watch remains in effect until 900 PM CST for central
Illinois.

LAT...LON 4063 8858 4056 8864 4057 8873 4076 8870
      4076 8859
TIME...MOT...LOC 0212Z 200DEG 27KT 4076 8859 

$$

Auten

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 1, 6:13 PM CST	Tornado Warning	ILX	DeWitt, Macon	32 min
Dec 1, 6:27 PM CST	Flash Flood Warning	ILX	Tazewell	3 hr
Dec 1, 6:42 PM CST	Tornado Warning	ILX	DeWitt, McLean	33 min
Dec 1, 7:13 PM CST	Tornado Warning Tornado observedConsiderable damage threat	ILX	McLean	32 min
Dec 1, 8:53 PM CST	River Flood Warning	ILX	Clay, Richland	13 hr

Nearby

Tornado Warnings in Illinois, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.