Alert archive / Illinois / Tornado Warnings in 2021
Tornado Warning 34, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Aug 9, 2021, 6:24 PM CDT for DuPage County, Kane County, Illinois. It was in force for 66 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
- Aug 9, 2021, 6:24 PM CDT (23:24 UTC)
- Expired
- Aug 9, 2021, 7:30 PM CDT
- In force
- 66 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties DuPage County, IL, Kane County, IL
The radar
The Chicago radar (KLOT), 41 km from the middle of the area, began a volume at 23:25 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 |
|---|---|---|---|
| Aug 9, 2:43 PM CDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.4 hours before the alert went out and 193 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
- 1676 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 705 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 171 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.7
The text
As transmitted.
294
WFUS53 KLOT 092324
TORLOT
ILC043-089-100030-
/O.NEW.KLOT.TO.W.0034.210809T2324Z-210810T0030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
624 PM CDT Mon Aug 9 2021
The National Weather Service in Chicago has issued a
* Tornado Warning for...
East central Kane County in northeastern Illinois...
Northwestern DuPage County in northeastern Illinois...
* Until 730 PM CDT.
* At 624 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Valley View, or near St. Charles, moving east at
20 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 dangerous storm will be near...
Bartlett and Wayne around 630 PM CDT.
West Chicago and Dupage Airport around 635 PM CDT.
Other locations in the path of this tornadic thunderstorm include
Carol Stream, Hanover Park, Bloomingdale, Winfield, Glendale Heights,
Wheaton, Glen Ellyn, Roselle, Addison, Itasca, Downers Grove and
Lombard.
This includes... DuPage County Fairgrounds and Wheaton College.
Including the following interstates...
I-290 between mile markers 5 and 8.
I-355 between mile markers 23 and 30.
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 4199 8826 4199 8800 4183 8802 4192 8835
4200 8834 4200 8826
TIME...MOT...LOC 2324Z 283DEG 20KT 4197 8832
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Carlaw3 follow-up statements
875
WWUS53 KLOT 092342
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
642 PM CDT Mon Aug 9 2021
ILC089-092351-
/O.CAN.KLOT.TO.W.0034.000000T0000Z-210810T0030Z/
Kane IL-
642 PM CDT Mon Aug 9 2021
...THE TORNADO WARNING FOR EAST CENTRAL KANE COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled. An
additional tornadic thunderstorm is ongoing northeast of Maple Park.
A Tornado Watch remains in effect until 1000 PM CDT for northeastern
Illinois.
LAT...LON 4185 8802 4192 8826 4199 8826 4199 8800
TIME...MOT...LOC 2341Z 279DEG 20KT 4195 8819
$$
ILC043-100030-
/O.CON.KLOT.TO.W.0034.000000T0000Z-210810T0030Z/
DuPage IL-
642 PM CDT Mon Aug 9 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
NORTHWESTERN DUPAGE COUNTY...
At 641 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Bartlett, moving east at 25 mph. Weather spotters
have reported a rotating wall cloud with this storm which could
produce a tornado at any time.
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...
Carol Stream, Hanover Park, Bloomingdale, Winfield, Glendale
Heights, Wheaton, Glen Ellyn, Roselle, Addison, Itasca and
Lombard.
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 4185 8802 4192 8826 4199 8826 4199 8800
TIME...MOT...LOC 2341Z 279DEG 20KT 4195 8819
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Carlaw798
WWUS53 KLOT 100007
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
707 PM CDT Mon Aug 9 2021
ILC043-100030-
/O.CON.KLOT.TO.W.0034.000000T0000Z-210810T0030Z/
DuPage IL-
707 PM CDT Mon Aug 9 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
NORTHWESTERN DUPAGE COUNTY...
At 706 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Itasca, or over Addison, moving east at 20 mph.
Additional areas of rotation exist just south of Hanover Park.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Bartlett, Carol Stream, Hanover Park, Addison, Glendale Heights, St.
Charles, West Chicago, Roselle, Bloomingdale, Itasca, Wayne and
Medinah.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4194 8801 4192 8826 4199 8826 4199 8800
TIME...MOT...LOC 0006Z 270DEG 18KT 4197 8803
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Carlaw497
WWUS53 KLOT 100028
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
728 PM CDT Mon Aug 9 2021
ILC043-100038-
/O.EXP.KLOT.TO.W.0034.000000T0000Z-210810T0030Z/
DuPage IL-
728 PM CDT Mon Aug 9 2021
...THE TORNADO WARNING FOR NORTHWESTERN DUPAGE COUNTY WILL EXPIRE AT
730 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1000 PM CDT for northeastern
Illinois.
LAT...LON 4194 8801 4192 8826 4199 8826 4199 8800
TIME...MOT...LOC 0028Z 283DEG 20KT 4194 8788
$$
DonofrioThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 6:52 AM CDT | Special Weather Statement | LOT | Winnebago | 23 min |
| Aug 9, 11:49 AM CDT | Areal Flood Advisory | LOT | Boone, DeKalb, Kane, McHenry, Ogle, Winnebago | 3 hr |
| Aug 9, 2:46 PM CDT | Heat Advisory | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 28 hr |
| Aug 9, 3:14 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 61 min |
| Aug 9, 3:25 PM CDT | Areal Flood Advisory | LOT | Boone, Winnebago | 3 hr |
| Aug 9, 3:46 PM CDT | Tornado Warning | LOT | Boone, Winnebago | 26 min |
| Aug 9, 4:12 PM CDT | Areal Flood Advisory | LOT | Boone, McHenry | 3 hr |
| Aug 9, 4:34 PM CDT | Tornado Warning | LOT | DeKalb | 41 min |
| Aug 9, 4:39 PM CDT | Tornado Warning | LOT | DeKalb, Ogle | 51 min |
| Aug 9, 5:11 PM CDT | Tornado Warning | LOT | Lee | 49 min |
| Aug 9, 5:15 PM CDT | Tornado Warning | LOT | DeKalb, Kane | 60 min |
| Aug 9, 5:32 PM CDT | Tornado Warning | LOT | DeKalb, Ogle | 43 min |
| Aug 9, 5:42 PM CDT | Tornado Warning | LOT | Kane | 48 min |
| Aug 9, 6:00 PM CDT | Tornado Warning | LOT | DeKalb, Lee | 26 min |
| Aug 9, 6:09 PM CDT | Tornado Warning | LOT | DeKalb, Kane | 51 min |
| Aug 9, 6:45 PM CDT | Special Marine Warning | LOT | 90 min | |
| Aug 9, 6:50 PM CDT | Tornado Warning | LOT | Kane | 40 min |
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.