Alert archive / Illinois / Tornado Warnings in 2021
Tornado Warning 24, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Jul 24, 2021, 8:51 PM CDT for Iroquois County, Illinois. It was in force for 24 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
- Jul 24, 2021, 8:51 PM CDT (01:51 UTC)
- Expired
- Jul 24, 2021, 9:15 PM CDT
- In force
- 24 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Iroquois County, IL
The radar
The Chicago radar (KLOT), 117 km from the middle of the area, began a volume at 01:51 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 |
|---|---|---|---|
| Jul 24, 3:32 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.9 hours before the alert went out and 82 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.
- Mixed-layer CAPE
- 2275 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1261 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 262 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 13.1
The text
As transmitted.
329
WFUS53 KLOT 250151
TORLOT
ILC075-250215-
/O.NEW.KLOT.TO.W.0024.210725T0151Z-210725T0215Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
851 PM CDT Sat Jul 24 2021
The National Weather Service in Chicago has issued a
* Tornado Warning for...
Southeastern Iroquois County in east central Illinois...
* Until 915 PM CDT.
* At 850 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Cissna Park, or 10 miles west of Milford, moving
southeast at 30 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 tornadic thunderstorm will remain over mainly rural areas of
southeastern Iroquois County, including the following locations...
Claytonville and Wellington.
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 4059 8799 4068 8787 4058 8753 4049 8754
4049 8787
TIME...MOT...LOC 0150Z 308DEG 26KT 4060 8789
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Birk2 follow-up statements
116
WWUS53 KLOT 250159
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
859 PM CDT Sat Jul 24 2021
ILC075-250215-
/O.CON.KLOT.TO.W.0024.000000T0000Z-210725T0215Z/
Iroquois IL-
859 PM CDT Sat Jul 24 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
SOUTHEASTERN IROQUOIS COUNTY...
At 859 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Cissna Park, or 8 miles southwest of Milford, moving
southeast at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Cissna Park, Wellington and Claytonville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4056 8796 4064 8786 4056 8753 4049 8754
4049 8787
TIME...MOT...LOC 0159Z 308DEG 26KT 4056 8782
TORNADO...RADAR INDICATED
HAIL...0.00IN
$$
Birk727
WWUS53 KLOT 250216
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
916 PM CDT Sat Jul 24 2021
ILC075-250226-
/O.EXP.KLOT.TO.W.0024.000000T0000Z-210725T0215Z/
Iroquois IL-
916 PM CDT Sat Jul 24 2021
...THE TORNADO WARNING FOR SOUTHEASTERN IROQUOIS COUNTY HAS
EXPIRED...
The storm which prompted the warning has weakened below severe
limits. Therefore, the warning has been allowed to expire. However
gusty winds and heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
east central Illinois.
LAT...LON 4056 8796 4064 8786 4056 8753 4049 8754
4049 8787
TIME...MOT...LOC 0216Z 308DEG 26KT 4049 8770
$$
BirkThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 7:22 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 53 min |
| Jul 24, 8:06 PM CDT | Special Weather Statement | LOT | Iroquois | 24 min |
| Jul 24, 8:10 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 65 min |
| Jul 24, 8:47 PM CDT | Areal Flood Advisory | LOT | Iroquois | 4 hr |
Nearby
Tornado Warnings in Illinois, 2021Every tornado warning in 2021Tornadoes 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.