Alert archive / Illinois / Tornado Warnings in 2024

Tornado Warning 21, NWS Chicago, IL

July 15, 2024DeKalb County, Ogle County, Illinois

NWS Chicago, IL issued this tornado warning at Jul 15, 2024, 8:08 PM CDT for DeKalb County, Ogle County, Illinois. It was in force for 37 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: Jul 15, 2024, 8:08 PM CDT (01:08 UTC)
Expired: Jul 15, 2024, 8:45 PM CDT
In force: 37 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties DeKalb County, IL, Ogle County, IL

The radar

The Chicago radar (KLOT), 76 km from the middle of the area, began a volume at 01:08 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
Jul 15, 8:28 PM CDT	TSTM WND GST 58	2 Nw Sycamore, IL
Jul 15, 8:32 PM CDT	TSTM WND GST 60	3 N Sycamore, IL
Jul 15, 8:34 PM CDT	TSTM WND DMG	1 Ne Sycamore, IL	Possible tree damage northeast of Sycamore. Relayed via mping. Time estimated by radar.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 15, 3:18 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 15, 6:53 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.1 hours before the alert went out and 150 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: 3794 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 1052 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 341 m²/s²
Significant tornado parameter: 5.6
Supercell composite: 33.4

Open this sounding in Storm Lab

The text

As transmitted.

166 
WFUS53 KLOT 160108
TORLOT
ILC037-141-160145-
/O.NEW.KLOT.TO.W.0021.240716T0108Z-240716T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
808 PM CDT Mon Jul 15 2024

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  Southeastern Ogle County in north central Illinois...
  Northern De Kalb County in north central Illinois...

* Until 845 PM CDT.

* At 808 PM CDT, severe thunderstorms capable of producing both
  tornadoes and extensive straight line wind damage were located near
  Davis Junction, or 9 miles southeast of Rockford Airport, 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.

* These dangerous storms will be near...
  Kirkland and Kingston around 815 PM CDT.
  Genoa around 820 PM CDT.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4215 8859 4207 8859 4206 8860 4190 8860
      4190 8894 4189 8903 4206 8903 4206 8894
      4215 8894
TIME...MOT...LOC 0108Z 266DEG 36KT 4210 8898 

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

$$

Borchardt

3 follow-up statements

333 
WWUS53 KLOT 160116
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
816 PM CDT Mon Jul 15 2024

ILC141-160125-
/O.CAN.KLOT.TO.W.0021.000000T0000Z-240716T0145Z/
Ogle IL-
816 PM CDT Mon Jul 15 2024

...THE TORNADO WARNING FOR SOUTHEASTERN OGLE COUNTY IS CANCELLED...

The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 100 AM CDT for north central
and northeastern Illinois.

&&

LAT...LON 4215 8859 4207 8859 4206 8860 4190 8860
      4190 8894 4215 8894
TIME...MOT...LOC 0115Z 266DEG 36KT 4211 8887 

$$

ILC037-160145-
/O.CON.KLOT.TO.W.0021.000000T0000Z-240716T0145Z/
De Kalb IL-
816 PM CDT Mon Jul 15 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR NORTHERN
DE KALB COUNTY...

At 815 PM CDT, a severe squall line capable of producing both
tornadoes and extensive straight line wind damage was located over
Kirkland, or 9 miles west of Genoa, moving east at 40 mph.

HAZARD...Tornadoes.

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.

These dangerous storms will be near...
  Genoa, Kirkland, and Kingston around 820 PM CDT.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4215 8859 4207 8859 4206 8860 4190 8860
      4190 8894 4215 8894
TIME...MOT...LOC 0115Z 266DEG 36KT 4211 8887 

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

$$

Borchardt

230 
WWUS53 KLOT 160132
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
832 PM CDT Mon Jul 15 2024

ILC037-160145-
/O.CON.KLOT.TO.W.0021.000000T0000Z-240716T0145Z/
De Kalb IL-
832 PM CDT Mon Jul 15 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR
NORTHEASTERN DE KALB COUNTY...

At 832 PM CDT, a severe squall line capable of producing both
tornadoes and extensive straight line wind damage was located over
Genoa, moving east at 35 mph.

HAZARD...Tornadoes.

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.

These dangerous storms will be near...
  Genoa around 835 PM CDT.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4215 8859 4207 8859 4206 8860 4198 8860
      4197 8876 4215 8882
TIME...MOT...LOC 0132Z 266DEG 29KT 4208 8869 

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

$$

Borchardt

522 
WWUS53 KLOT 160145
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
845 PM CDT Mon Jul 15 2024

ILC037-160155-
/O.EXP.KLOT.TO.W.0021.000000T0000Z-240716T0145Z/
De Kalb IL-
845 PM CDT Mon Jul 15 2024

...THE TORNADO WARNING FOR NORTHEASTERN DE KALB COUNTY HAS EXPIRED...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.

A Tornado Watch remains in effect until 100 AM CDT for north central
and northeastern Illinois.

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

&&

LAT...LON 4215 8859 4207 8859 4206 8860 4198 8860
      4197 8876 4215 8882
TIME...MOT...LOC 0145Z 266DEG 36KT 4209 8853 

$$

Borchardt

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 7:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Lee, Ogle, Winnebago	75 min
Jul 15, 7:16 PM CDT	Tornado Warning	LOT	Ogle	15 min
Jul 15, 7:36 PM CDT	Special Marine Warning	LOT		39 min
Jul 15, 7:38 PM CDT	Severe Thunderstorm Warning	LOT	Lake	35 min
Jul 15, 7:54 PM CDT	Tornado Warning	LOT	Boone, Ogle, Winnebago	36 min
Jul 15, 8:01 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Boone, DeKalb, Kane, Lee, McHenry, Ogle and 1 more	74 min
Jul 15, 8:04 PM CDT	Special Marine Warning	LOT		3 hr
Jul 15, 8:11 PM CDT	Flash Flood Warning	LOT	Winnebago	3 hr
Jul 15, 8:21 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	DeKalb, Kane, Kendall, LaSalle, Lee	54 min
Jul 15, 8:31 PM CDT	Tornado Warning	LOT	Boone, Kane, McHenry	24 min
Jul 15, 8:35 PM CDT	Flash Flood Warning	LOT	Lake	4 hr
Jul 15, 8:40 PM CDT	Tornado Warning	LOT	Kane	35 min
Jul 15, 8:43 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Ford, Grundy, Kendall, LaSalle, Livingston	62 min
Jul 15, 8:52 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Lake	83 min
Jul 15, 8:52 PM CDT	Tornado Warning	LOT	DuPage, Kane	38 min
Jul 15, 9:01 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Kankakee, Will	74 min
Jul 15, 9:04 PM CDT	Tornado Warning Tornado observed	LOT	Kendall, Will	25 min
Jul 15, 9:10 PM CDT	Tornado Warning Tornado observed	LOT	DuPage	24 min
Jul 15, 9:13 PM CDT	Tornado Warning	LOT	Cook, Grundy, Kendall, Will	47 min
Jul 15, 9:16 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Ford, Iroquois	74 min
Jul 15, 9:16 PM CDT	Tornado Warning	LOT	Cook, DuPage, Lake	44 min
Jul 15, 9:27 PM CDT	Tornado Warning	LOT	Cook, DuPage	33 min
Jul 15, 9:29 PM CDT	Flash Flood Warning	LOT	Cook, DuPage, Will	3 hr
Jul 15, 9:37 PM CDT	Tornado Warning	LOT	Kankakee	38 min
Jul 15, 9:46 PM CDT	Tornado Warning	LOT	Iroquois	59 min
Jul 15, 11:08 PM CDT	River Flood Warning	LOT	Lake	7 days
Jul 15, 11:08 PM CDT	River Flood Warning	LOT	Lake	12 days
Jul 16, 12:15 AM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Will	4 hr
Jul 16, 5:35 AM CDT	River Flood Warning	LOT	Cook	64 hr
Jul 16, 5:39 AM CDT	River Flood Warning	LOT	Cook, Lake	64 hr
Jul 16, 7:03 AM CDT	River Flood Watch	LOT	Bureau, LaSalle, Putnam	14 hr

Nearby

Tornado Warnings in Illinois, 2024 Every tornado warning in 2024 Tornadoes in 2024

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.