Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Chicago, IL

June 12, 2021Ford County, Iroquois County, Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 12, 2021, 5:11 PM CDT for Ford County, Iroquois County, Livingston County, Illinois. It was in force for 64 min. 2 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: Jun 12, 2021, 5:11 PM CDT (22:11 UTC)
Expired: Jun 12, 2021, 6:15 PM CDT
In force: 64 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Chicago radar (KLOT), 91 km from the middle of the area, began a volume at 22:10 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
Jun 12, 5:15 PM CDT	TSTM WND DMG	2 Nnw Danforth, IL	BOX TRUCK BLOWN OVER ON I-57 NEAR MILE MARKER 290. NO INJURIES PER ISP.
Jun 12, 5:17 PM CDT	TSTM WND GST 48	Chatsworth, IL	HEAVY RAINFALL WITH POOR VISIBILITY.

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, 10.2 hours before the alert went out and 83 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: 897 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 1584 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

279 
WUUS53 KLOT 122211
SVRLOT
ILC053-075-105-122315-
/O.NEW.KLOT.SV.W.0009.210612T2211Z-210612T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Chicago/Romeoville
511 PM CDT Sat Jun 12 2021

The National Weather Service in Chicago has issued a

* Severe Thunderstorm Warning for...
  Southeastern Livingston County in central Illinois...
  North central Ford County in east central Illinois...
  Northern Iroquois County in east central Illinois...

* Until 615 PM CDT.

* At 511 PM CDT, a severe thunderstorm was located 7 miles northwest
  of Ashkum, or 7 miles west of Clifton, moving southeast at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Watseka, Gilman, Clifton, Chatsworth, Onarga, Piper City, Ashkum,
  Cullom, Crescent City, Danforth, Roberts, Woodland, Cabery,
  Thawville, Kempton and Stelle.

Including the following interstate...
 I-57 between mile markers 275 and 298.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4061 8824 4089 8840 4099 8825 4100 8798
      4075 8764 4065 8785
TIME...MOT...LOC 2211Z 323DEG 12KT 4093 8808 

HAIL...1.00IN
WIND...60MPH
 
$$

Borchardt

4 follow-up statements

734 
WWUS53 KLOT 122224
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
524 PM CDT Sat Jun 12 2021

ILC105-122234-
/O.CAN.KLOT.SV.W.0009.000000T0000Z-210612T2315Z/
Livingston IL-
524 PM CDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LIVINGSTON COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4061 8824 4062 8823 4086 8824 4095 8797
      4075 8764 4065 8785
TIME...MOT...LOC 2224Z 331DEG 17KT 4086 8805 

$$

ILC053-075-122315-
/O.CON.KLOT.SV.W.0009.000000T0000Z-210612T2315Z/
Ford IL-Iroquois IL-
524 PM CDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR CENTRAL FORD AND NORTHERN IROQUOIS COUNTIES...

At 524 PM CDT, a severe thunderstorm was located near Ashkum, or 7
miles northwest of Gilman, moving southeast at 20 mph.

HAZARD...70 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Watseka, Gilman, Clifton, Onarga, Piper City, Ashkum, Crescent City,
Danforth, Roberts, Woodland and Thawville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4061 8824 4062 8823 4086 8824 4095 8797
      4075 8764 4065 8785
TIME...MOT...LOC 2224Z 331DEG 17KT 4086 8805 

HAIL...1.25IN
WIND...70MPH
 
$$

Borchardt

064 
WWUS53 KLOT 122239
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
539 PM CDT Sat Jun 12 2021

ILC053-075-122315-
/O.CON.KLOT.SV.W.0009.000000T0000Z-210612T2315Z/
Ford IL-Iroquois IL-
539 PM CDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR CENTRAL FORD AND CENTRAL IROQUOIS COUNTIES...

At 539 PM CDT, a severe thunderstorm was located near Buckley, or 8
miles southwest of Gilman, moving south at 20 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Watseka, Gilman, Onarga, Piper City, Crescent City, Danforth,
Roberts, Woodland and Thawville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4061 8824 4062 8823 4077 8823 4086 8786
      4075 8764 4065 8785
TIME...MOT...LOC 2239Z 344DEG 17KT 4066 8807 

HAIL...1.75IN
WIND...70MPH
 
$$

Borchardt

086 
WWUS53 KLOT 122252
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
552 PM CDT Sat Jun 12 2021

ILC053-075-122315-
/O.CON.KLOT.SV.W.0009.000000T0000Z-210612T2315Z/
Ford IL-Iroquois IL-
552 PM CDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR CENTRAL FORD AND CENTRAL IROQUOIS COUNTIES...

At 552 PM CDT, a severe thunderstorm was located over Buckley, or 9
miles south of Gilman, moving southeast at 15 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Watseka, Gilman, Onarga, Crescent City, Roberts, Woodland and
Thawville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4061 8824 4062 8823 4071 8823 4081 8781
      4075 8766 4065 8785
TIME...MOT...LOC 2252Z 323DEG 12KT 4062 8803 

HAIL...1.75IN
WIND...70MPH
 
$$

Borchardt

829 
WWUS53 KLOT 122305
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
605 PM CDT Sat Jun 12 2021

ILC053-075-122315-
/O.EXP.KLOT.SV.W.0009.000000T0000Z-210612T2315Z/
Ford IL-Iroquois IL-
605 PM CDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FORD AND CENTRAL
IROQUOIS COUNTIES WILL EXPIRE AT 615 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Chicago.

LAT...LON 4061 8824 4062 8823 4071 8823 4081 8781
      4075 8766 4065 8785
TIME...MOT...LOC 2305Z 323DEG 12KT 4059 8800 

$$

Borchardt

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 1:23 PM CDT	Special Weather Statement	LOT	Cook, DeKalb, DuPage, Grundy, Kane, Kankakee and 5 more	112 min
Jun 12, 1:52 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	68 min
Jun 12, 2:26 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	41 min
Jun 12, 2:37 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage	3 hr
Jun 12, 2:55 PM CDT	Severe Thunderstorm Warning	LOT	DuPage, Kane, Kendall, Will	65 min
Jun 12, 3:26 PM CDT	Severe Thunderstorm Warning	LOT	Kane, Kendall, Will	47 min
Jun 12, 4:13 PM CDT	Special Weather Statement	LOT	Kankakee	62 min
Jun 12, 5:04 PM CDT	Special Weather Statement	LOT	Ford, Iroquois	71 min
Jun 12, 5:30 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois	45 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021 Every severe thunderstorm warning in 2021

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.