Alert archive / Illinois / Tornado Warnings in 2018

Tornado Warning 7, NWS Lincoln, IL

June 21, 2018Knox County, Illinois

NWS Lincoln, IL issued this tornado warning at Jun 21, 2018, 12:35 PM CDT for Knox County, Illinois. It was in force for 25 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: Jun 21, 2018, 12:35 PM CDT (17:35 UTC)
Expired: Jun 21, 2018, 1:00 PM CDT
In force: 25 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Knox County, IL

The radar

The Quad Cities radar (KDVN), 91 km from the middle of the area, began a volume at 17:36 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, 5.6 hours before the alert went out and 89 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: 263 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 469 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

722 
WFUS53 KILX 211735
TORILX
ILC095-211800-
/O.NEW.KILX.TO.W.0007.180621T1735Z-180621T1800Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Lincoln IL
1235 PM CDT THU JUN 21 2018

The National Weather Service in Lincoln has issued a

* Tornado Warning for...
  Southeastern Knox County in west central Illinois...

* Until 100 PM CDT
    
* At 1235 PM CDT, a severe thunderstorm capable of producing a
  tornado was located near Yates City, or 14 miles north of Canton,
  moving north at 20 mph.

  HAZARD...Tornado. 

  SOURCE...Law Enforcement. 

  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...
  Yates City and Maquon around 1240 PM CDT. 
  Gilson around 1250 PM CDT. 
  Williamsfield around 100 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Snake
Den Hollow and Dahinda.

This includes Interstate 74 between mile markers 55 and 66.
 
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 4102 8999 4071 9002 4071 9019 4073 9023
      4105 9023
TIME...MOT...LOC 1735Z 188DEG 19KT 4076 9009 

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

$$

Barker

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:16 PM CDT	Flash Flood Warning	ILX	Fulton, Schuyler	6 hr
Jun 20, 7:26 PM CDT	Special Weather Statement	ILX	Scott	49 min
Jun 20, 7:36 PM CDT	Severe Thunderstorm Warning	ILX	Morgan, Scott	24 min
Jun 20, 7:57 PM CDT	Special Weather Statement	ILX	Cass, Morgan	48 min
Jun 20, 8:10 PM CDT	Areal Flood Advisory	ILX	Peoria, Tazewell	3 hr
Jun 20, 8:28 PM CDT	Areal Flood Advisory	ILX	Vermilion	3 hr
Jun 20, 8:41 PM CDT	Flash Flood Warning	ILX	Fulton, Peoria, Tazewell, Woodford	6 hr
Jun 21, 12:04 PM CDT	Special Weather Statement	ILX	Logan	41 min
Jun 21, 12:14 PM CDT	Special Weather Statement	ILX	Fulton, Knox, Marshall, Mason, Peoria, Stark and 2 more	4 hr
Jun 21, 1:00 PM CDT	Tornado Warning Tornado observed	ILX	Fulton, Knox, Peoria	30 min
Jun 21, 2:50 PM CDT	Special Weather Statement	ILX	Logan	40 min
Jun 21, 4:10 PM CDT	Flash Flood Warning	ILX	Marshall, Tazewell, Woodford	11 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.