Alert archive / Illinois / Tornado Warnings in 2021

Tornado Warning 9, NWS Chicago, IL

June 25, 2021Iroquois County, Illinois

NWS Chicago, IL issued this tornado warning at Jun 25, 2021, 8:11 PM CDT for Iroquois County, Illinois. It was in force for 22 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 25, 2021, 8:11 PM CDT (01:11 UTC)
Expired: Jun 25, 2021, 8:33 PM CDT
In force: 22 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Iroquois County, IL

The radar

The Chicago radar (KLOT), 88 km from the middle of the area, began a volume at 01:10 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 25, 5:06 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.2 hours before the alert went out and 93 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: 1254 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.6

Open this sounding in Storm Lab

The text

As transmitted.

707 
WFUS53 KLOT 260111
TORLOT
ILC075-260145-
/O.NEW.KLOT.TO.W.0009.210626T0111Z-210626T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
811 PM CDT Fri Jun 25 2021

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  Northwestern Iroquois County in east central Illinois...

* Until 845 PM CDT.
    
* At 810 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Danforth, moving east 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.

* This tornadic thunderstorm will remain over mainly rural areas of
  northwestern Iroquois County, including the following locations...
  Danforth.

Including the following interstate...
 I-57 between mile markers 286 and 290.
 
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 4079 8802 4084 8802 4091 8784 4078 8782
TIME...MOT...LOC 0110Z 252DEG 11KT 4082 8798 

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

$$

Kluber

3 follow-up statements

202 
WWUS53 KLOT 260113
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
813 PM CDT Fri Jun 25 2021

ILC075-260145-
/O.CON.KLOT.TO.W.0009.000000T0000Z-210626T0145Z/
Iroquois IL-
813 PM CDT Fri Jun 25 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR
NORTHWESTERN IROQUOIS COUNTY...
    
At 812 PM CDT, a confirmed tornado was located near Dnaforth, moving 
east at 15 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Weather spotters 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.

Locations impacted include...
Danforth.

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 4079 8802 4084 8802 4091 8784 4078 8782
TIME...MOT...LOC 0112Z 252DEG 11KT 4082 8798 

TORNADO...OBSERVED
HAIL...1.00IN

$$

Kluber

679 
WWUS53 KLOT 260122
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
822 PM CDT Fri Jun 25 2021

ILC075-260145-
/O.CON.KLOT.TO.W.0009.000000T0000Z-210626T0145Z/
Iroquois IL-
822 PM CDT Fri Jun 25 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR NORTH
CENTRAL IROQUOIS COUNTY...
    
At 822 PM CDT, a severe thunderstorm capable of producing a tornado 
was located near Danforth, moving northeast 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.

This tornadic thunderstorm will remain over mainly rural areas of
north central Iroquois County.

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 4082 8795 4086 8797 4091 8784 4084 8783
TIME...MOT...LOC 0121Z 242DEG 15KT 4085 8793 

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

$$

Kluber

644 
WWUS53 KLOT 260133
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
833 PM CDT Fri Jun 25 2021

ILC075-260143-
/O.CAN.KLOT.TO.W.0009.000000T0000Z-210626T0145Z/
Iroquois IL-
833 PM CDT Fri Jun 25 2021

...THE TORNADO WARNING FOR NORTH CENTRAL IROQUOIS COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
east central Illinois.

LAT...LON 4082 8795 4086 8797 4091 8784 4084 8783
TIME...MOT...LOC 0131Z 252DEG 11KT 4086 8788 

$$

Kluber

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 8:01 PM CDT	Tornado Warning	LOT	Iroquois	31 min
Jun 25, 8:37 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	5 hr
Jun 25, 9:11 PM CDT	Special Weather Statement	LOT	Ford	64 min
Jun 25, 10:39 PM CDT	Special Weather Statement	LOT	Ford	66 min
Jun 26, 11:27 AM CDT	Tornado Warning	LOT	Livingston	18 min
Jun 26, 11:34 AM CDT	Tornado Warning	LOT	Will	26 min
Jun 26, 11:44 AM CDT	Tornado Warning	LOT	Grundy, LaSalle, Livingston	36 min
Jun 26, 11:49 AM CDT	Tornado Warning	LOT	Cook	26 min
Jun 26, 11:55 AM CDT	Special Marine Warning	LOT		2 hr
Jun 26, 12:18 PM CDT	Flash Flood Warning	LOT	Cook, DuPage, Will	6 hr
Jun 26, 12:33 PM CDT	Special Marine Warning	LOT		117 min
Jun 26, 12:34 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	41 min
Jun 26, 12:59 PM CDT	Severe Thunderstorm Warning	LOT	Cook	11 min
Jun 26, 1:26 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	34 min
Jun 26, 2:08 PM CDT	Tornado Warning Tornado observed	LOT	Cook, Will	25 min
Jun 26, 2:24 PM CDT	Special Marine Warning	LOT		2 hr
Jun 26, 2:43 PM CDT	Areal Flood Advisory	LOT	Cook, Ford, Grundy, Iroquois, Kankakee, LaSalle and 2 more	6 hr
Jun 26, 3:31 PM CDT	Special Marine Warning	LOT		119 min
Jun 26, 3:34 PM CDT	Tornado Warning	LOT	Livingston	41 min
Jun 26, 3:50 PM CDT	Flash Flood Warning	LOT	Cook, Grundy, Kankakee, Will	6 hr
Jun 26, 3:56 PM CDT	Tornado Warning	LOT	Kankakee, Will	34 min
Jun 26, 3:57 PM CDT	Flash Flood Warning	LOT	Ford, Grundy, Iroquois, Kankakee, Livingston	6 hr
Jun 26, 3:57 PM CDT	Tornado Warning	LOT	Grundy, Kankakee, Livingston	33 min
Jun 26, 4:13 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	47 min
Jun 26, 4:23 PM CDT	Tornado Warning	LOT	Ford, Livingston	36 min
Jun 26, 4:26 PM CDT	River Flood Warning	LOT	Cook	28 hr
Jun 26, 4:26 PM CDT	Tornado Warning	LOT	Cook, Will	34 min
Jun 26, 4:30 PM CDT	Special Marine Warning	LOT		2 hr
Jun 26, 4:41 PM CDT	Tornado Warning	LOT	Kankakee	34 min
Jun 26, 4:49 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Kankakee, Will	56 min
Jun 26, 5:21 PM CDT	Severe Thunderstorm Warning	LOT	Will	54 min
Jun 26, 5:44 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	76 min
Jun 26, 5:54 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Livingston	3 hr
Jun 26, 6:23 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Will	7 hr
Jun 26, 6:55 PM CDT	River Flood Warning	LOT	Livingston	3 days

Nearby

Tornado Warnings in Illinois, 2021 Every tornado warning in 2021 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.