Alert archive / Illinois / Tornado Warnings in 2021
Tornado Warning 30, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Aug 9, 2021, 5:32 PM CDT for DeKalb County, Ogle County, Illinois. It was in force for 43 min. 1 report 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
- Aug 9, 2021, 5:32 PM CDT (22:32 UTC)
- Expired
- Aug 9, 2021, 6:15 PM CDT
- In force
- 43 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 0.75 in
Counties DeKalb County, IL, Ogle County, IL
The radar
The Chicago radar (KLOT), 77 km from the middle of the area, began a volume at 22:33 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 |
|---|---|---|---|
| Aug 9, 6:05 PM CDT | FUNNEL CLOUD | 3 Wsw Sycamore, IL | MULTIPLE REPORTS RECEIVED OF WALL CLOUD WITH POSSIBLE FUNNELS BETWEEN DEKALB AND SYCAMORE. |
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 |
|---|---|---|---|
| Aug 9, 2:43 PM CDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 140 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.
955
WFUS53 KLOT 092232
TORLOT
ILC037-141-092315-
/O.NEW.KLOT.TO.W.0030.210809T2232Z-210809T2315Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
532 PM CDT Mon Aug 9 2021
The National Weather Service in Chicago has issued a
* Tornado Warning for...
East central Ogle County in north central Illinois...
Central De Kalb County in north central Illinois...
* Until 615 PM CDT.
* At 532 PM CDT, a confirmed tornado was located near Malta, or 7
miles northeast of Rochelle, moving east at 25 mph.
HAZARD...Damaging tornado.
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.
* The tornado will be near...
Malta around 545 PM CDT.
Other locations in the path of this tornadic thunderstorm include
DeKalb, Sycamore and Cortland.
This includes... Northern Illinois University.
Including the following interstate...
I-88 between mile markers 87 and 95.
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 4195 8901 4205 8899 4201 8867 4185 8871
TIME...MOT...LOC 2232Z 280DEG 21KT 4200 8895
TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN
$$
Carlaw2 follow-up statements
154
WWUS53 KLOT 092244
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
544 PM CDT Mon Aug 9 2021
ILC141-092253-
/O.CAN.KLOT.TO.W.0030.000000T0000Z-210809T2315Z/
Ogle IL-
544 PM CDT Mon Aug 9 2021
...THE TORNADO WARNING FOR EAST CENTRAL OGLE COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM CDT for north central
Illinois.
LAT...LON 4201 8867 4187 8870 4186 8871 4198 8894
4199 8894 4204 8892
TIME...MOT...LOC 2243Z 278DEG 20KT 4200 8888
$$
ILC037-092315-
/O.CON.KLOT.TO.W.0030.000000T0000Z-210809T2315Z/
De Kalb IL-
544 PM CDT Mon Aug 9 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR CENTRAL
DE KALB COUNTY...
At 543 PM CDT, a confirmed tornado was located just southeast of the
town of Esmond, or 10 miles northwest of DeKalb, moving east at 25
mph.
HAZARD...Damaging tornado.
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...
DeKalb, Sycamore and Cortland.
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 4201 8867 4187 8870 4186 8871 4198 8894
4199 8894 4204 8892
TIME...MOT...LOC 2243Z 278DEG 20KT 4200 8888
TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN
$$
Carlaw453
WWUS53 KLOT 092253
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
553 PM CDT Mon Aug 9 2021
ILC037-092315-
/O.CON.KLOT.TO.W.0030.000000T0000Z-210809T2315Z/
De Kalb IL-
553 PM CDT Mon Aug 9 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR CENTRAL
DE KALB COUNTY...
At 552 PM CDT, a severe thunderstorm capable of producing a tornado
was located near DeKalb, moving east at 30 mph. This storm has a
history of producing tornadoes and could produce additional
tornadoes at any time.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
DeKalb, Sycamore and Cortland.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4201 8867 4187 8870 4197 8887 4203 8885
TIME...MOT...LOC 2252Z 282DEG 24KT 4198 8878
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
CarlawThe 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, 5:42 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, 6:24 PM CDT | Tornado Warning | LOT | DuPage, Kane | 66 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.