Alert archive / Illinois / Tornado Warnings in 2018

Tornado Warning 4, NWS St. Louis, MO

June 11, 2018Calhoun County, Greene County, Pike County, Illinois

NWS St. Louis, MO issued this tornado warning at Jun 11, 2018, 4:03 PM CDT for Calhoun County, Greene County, Pike County, Illinois. It was in force for 27 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 11, 2018, 4:03 PM CDT (21:03 UTC)
Expired: Jun 11, 2018, 4:30 PM CDT
In force: 27 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Calhoun County, IL, Greene County, IL, Pike County, IL

The radar

The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 21:04 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

Lincoln, IL (KILX), launched 12:00Z, 9.1 hours before the alert went out and 185 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: 389 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 711 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

006 
WFUS53 KLSX 112103
TORLSX
ILC013-061-149-112145-
/O.NEW.KLSX.TO.W.0004.180611T2103Z-180611T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
403 PM CDT MON JUN 11 2018

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  North central Calhoun County in southwestern Illinois...
  Northwestern Greene County in southwestern Illinois...
  Southeastern Pike County in west central Illinois...

* Until 445 PM CDT.
    
* At 403 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 10 miles northeast of Belleview, moving southeast at 15
  mph.

  HAZARD...Tornado and quarter size hail.

  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 include...
  White Hall, Bedford, Patterson, Kampsville, Hillview, Pearl,
  Walkersville, Haypress and Beecreek.

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 3953 9058 3952 9058 3952 9056 3944 9038
      3929 9059 3942 9074 3954 9059
TIME...MOT...LOC 2103Z 307DEG 12KT 3943 9061 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Kanofsky

2 follow-up statements

091 
WWUS53 KLSX 112122
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
422 PM CDT MON JUN 11 2018

ILC149-112131-
/O.CAN.KLSX.TO.W.0004.000000T0000Z-180611T2145Z/
Pike IL-
422 PM CDT MON JUN 11 2018

...THE TORNADO WARNING FOR SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL
ILLINOIS IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 3944 9038 3929 9059 3939 9068 3940 9061
      3943 9062 3944 9061 3946 9061 3948 9059
      3952 9058 3952 9056
TIME...MOT...LOC 2121Z 300DEG 14KT 3939 9055 

$$

ILC013-061-112145-
/O.CON.KLSX.TO.W.0004.000000T0000Z-180611T2145Z/
Calhoun IL-Greene IL-
422 PM CDT MON JUN 11 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR NORTHERN
CALHOUN AND NORTHWESTERN GREENE COUNTIES...
    
At 421 PM CDT, a severe thunderstorm capable of producing a tornado
was located 8 miles southwest of White Hall, moving southeast at 15
mph.

HAZARD...Tornado and quarter size hail.

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 include...
White Hall, Patterson, Hillview, Haypress and Walkersville. 

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 3944 9038 3929 9059 3939 9068 3940 9061
      3943 9062 3944 9061 3946 9061 3948 9059
      3952 9058 3952 9056
TIME...MOT...LOC 2121Z 300DEG 14KT 3939 9055 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Tilly

066 
WWUS53 KLSX 112130
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
430 PM CDT MON JUN 11 2018

ILC013-061-112139-
/O.CAN.KLSX.TO.W.0004.000000T0000Z-180611T2145Z/
Calhoun IL-Greene IL-
430 PM CDT MON JUN 11 2018

...THE TORNADO WARNING FOR NORTHERN CALHOUN AND NORTHWESTERN GREENE
COUNTIES IS CANCELLED...
    
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.

Remember, a Severe Thunderstorm Warning still remains in effect for
Greene County until 515 PM CDT.

LAT...LON 3944 9038 3929 9059 3939 9068 3940 9061
      3943 9062 3944 9061 3946 9061 3948 9059
      3952 9058 3952 9056
TIME...MOT...LOC 2129Z 307DEG 12KT 3937 9052 

$$

Tilly

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 10, 7:22 PM CDT	Flash Flood Warning	LSX	Montgomery	6 hr
Jun 10, 7:37 PM CDT	Special Weather Statement	LSX	Calhoun	38 min
Jun 11, 3:45 PM CDT	Special Weather Statement	LSX	Greene	45 min
Jun 11, 4:28 PM CDT	Severe Thunderstorm Warning	LSX	Greene	47 min
Jun 11, 6:21 PM CDT	Special Weather Statement	LSX	Madison	24 min

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.