Alert archive / Illinois / Tornado Warnings in 2018

Tornado Warning 11, NWS Lincoln, IL

August 7, 2018Logan County, Mason County, Illinois

NWS Lincoln, IL issued this tornado warning at Aug 7, 2018, 1:41 AM CDT for Logan County, Mason County, Illinois. It was in force for 34 min. 3 reports 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: Aug 7, 2018, 1:41 AM CDT (06:41 UTC)
Expired: Aug 7, 2018, 2:15 AM CDT
In force: 34 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Logan County, IL, Mason County, IL

The radar

The Lincoln radar (KILX), 13 km from the middle of the area, began a volume at 06:42 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
Aug 7, 1:45 AM CDT	TSTM WND DMG	San Jose, IL	POWER POLE DOWN
Aug 7, 2:05 AM CDT	TSTM WND DMG	Lincoln, IL	TREE BRANCH DOWN ON POWER LINES
Aug 7, 2:15 AM CDT	TSTM WND DMG	Atlanta, IL	MULTIPLE POWER LINES DOWN

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 00:00Z, 6.7 hours before the alert went out and 73 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: 3036 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1284 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 11.4

Open this sounding in Storm Lab

The text

As transmitted.

313 
WFUS53 KILX 070641
TORILX
ILC107-125-070715-
/O.NEW.KILX.TO.W.0011.180807T0641Z-180807T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Lincoln IL
141 AM CDT TUE AUG 7 2018

The National Weather Service in Lincoln has issued a

* Tornado Warning for...
  Northern Logan County in central Illinois...
  East central Mason County in central Illinois...

* Until 215 AM CDT.
    
* At 141 AM CDT, a severe thunderstorm capable of producing a tornado
  was located over San Jose, or near Mason City, moving east at 40
  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...
  Emden around 150 AM CDT.
  Hartsburg around 155 AM CDT.
  Lincoln around 205 AM CDT.
  Atlanta around 210 AM CDT.
  Beason around 215 AM CDT.

Other locations impacted by this tornadic thunderstorm include
Lawndale and New Holland.

This includes the following highways...
 Interstate 155 between mile markers 0 and 9.
 Interstate 55 between mile markers 122 and 141.

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 4032 8969 4028 8926 4028 8915 4002 8915
      4020 8975
TIME...MOT...LOC 0641Z 287DEG 34KT 4027 8961 

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

$$

Bak

2 follow-up statements

112 
WWUS53 KILX 070700
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
200 AM CDT TUE AUG 7 2018

ILC125-070710-
/O.CAN.KILX.TO.W.0011.000000T0000Z-180807T0715Z/
Mason-
200 AM CDT TUE AUG 7 2018

...THE TORNADO WARNING FOR EAST CENTRAL MASON 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 4030 8955 4028 8926 4028 8915 4002 8915
      4015 8957
TIME...MOT...LOC 0700Z 287DEG 34KT 4021 8936 

$$

ILC107-070715-
/O.CON.KILX.TO.W.0011.000000T0000Z-180807T0715Z/
Logan-
200 AM CDT TUE AUG 7 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 215 AM CDT FOR NORTHERN
LOGAN COUNTY...
    
At 200 AM CDT, a severe thunderstorm capable of producing a tornado
was located near Lincoln, moving east at 40 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...
  Atlanta around 210 AM CDT.
  Chestnut and Beason around 215 AM CDT.

Other locations impacted by this tornadic thunderstorm include
Lawndale.

This includes the following highways...
 Interstate 155 between mile markers 0 and 9.
 Interstate 55 between mile markers 122 and 141.

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 4030 8955 4028 8926 4028 8915 4002 8915
      4015 8957
TIME...MOT...LOC 0700Z 287DEG 34KT 4021 8936 

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

$$

Bak

056 
WWUS53 KILX 070706
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
206 AM CDT TUE AUG 7 2018

ILC107-070716-
/O.EXP.KILX.TO.W.0011.000000T0000Z-180807T0715Z/
Logan-
206 AM CDT TUE AUG 7 2018

...THE TORNADO WARNING FOR NORTHERN LOGAN COUNTY WILL EXPIRE AT 215
AM CDT...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

LAT...LON 4030 8955 4028 8926 4028 8915 4002 8915
      4015 8957
TIME...MOT...LOC 0706Z 287DEG 34KT 4020 8930 

$$

Bak

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 7:06 PM CDT	Special Weather Statement	ILX	Vermilion	39 min
Aug 6, 7:22 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	30 min
Aug 6, 7:39 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Vermilion	43 min
Aug 6, 7:57 PM CDT	Tornado Warning	ILX	Champaign	22 min
Aug 6, 10:14 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	46 min
Aug 6, 10:17 PM CDT	Flash Flood Warning	ILX	Champaign, Vermilion	3 hr
Aug 6, 10:30 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	15 min
Aug 6, 10:46 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	44 min
Aug 7, 12:35 AM CDT	Severe Thunderstorm Warning	ILX	Cass, Fulton, Mason, Peoria, Schuyler, Tazewell	40 min
Aug 7, 1:15 AM CDT	Areal Flood Advisory	ILX	Champaign, Vermilion	3 hr
Aug 7, 1:20 AM CDT	Severe Thunderstorm Warning	ILX	Fulton, Logan, Mason, Menard, Tazewell	40 min
Aug 7, 1:35 AM CDT	Severe Thunderstorm Warning	ILX	Logan, McLean, Tazewell	40 min
Aug 7, 2:13 AM CDT	Severe Thunderstorm Warning	ILX	DeWitt, Logan, McLean, Macon	15 min
Aug 7, 3:03 AM CDT	Severe Thunderstorm Warning	ILX	Morgan, Sangamon	42 min
Aug 7, 3:47 AM CDT	Special Weather Statement	ILX	Macon	43 min
Aug 7, 4:12 AM CDT	Areal Flood Advisory	ILX	Champaign, Vermilion	3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.