Alert archive / Illinois / Tornado Warnings in 2021
Tornado Warning 22, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Jul 7, 2021, 1:16 PM CDT for Winnebago County, Illinois. It was in force for 35 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
- Jul 7, 2021, 1:16 PM CDT (18:16 UTC)
- Expired
- Jul 7, 2021, 1:51 PM CDT
- In force
- 35 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Winnebago County, IL
The radar
The Milwaukee radar (KMKX), 73 km from the middle of the area, began a volume at 18:17 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 7, 1:35 PM CDT | FUNNEL CLOUD | Rockton, IL | LOCAL BROADCAST METEOROLOGIST RELAYED SEVERAL HIGH-BASED FUNNELS WERE OBSERVED VIEWED FROM IL-2 NEAR ROCKTON AS WELL AS ONE 1/4 OF THE WAY DOWN TO THE GROUND NEAR SOUTH BELOIT. NO CONTACT WITH THE GROUND WAS SEEN WITH ANY FUNNEL. ALSO, 40-50 MPH WIND GUSTS WER |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 6.3 hours before the alert went out and 149 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
- 119 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 1359 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
650
WFUS53 KLOT 071816
TORLOT
ILC201-071900-
/O.NEW.KLOT.TO.W.0022.210707T1816Z-210707T1900Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
116 PM CDT Wed Jul 7 2021
The National Weather Service in Chicago has issued a
* Tornado Warning for...
Northern Winnebago County in north central Illinois...
* Until 200 PM CDT.
* At 115 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Rockton, moving east at 25 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...
South Beloit and Rockton around 130 PM CDT.
Machesney Park and Roscoe around 135 PM CDT.
Including the following interstate...
I-90 between mile markers 1 and 9.
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 4249 8894 4237 8894 4239 8931 4250 8931
TIME...MOT...LOC 1815Z 269DEG 23KT 4246 8918
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
MDB2 follow-up statements
037
WWUS53 KLOT 071825
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
125 PM CDT Wed Jul 7 2021
ILC201-071900-
/O.CON.KLOT.TO.W.0022.000000T0000Z-210707T1900Z/
Winnebago IL-
125 PM CDT Wed Jul 7 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 PM CDT FOR
NORTHEASTERN WINNEBAGO COUNTY...
At 125 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Rockton, moving east at 25 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Rockton around 130 PM CDT.
Machesney Park and South Beloit around 135 PM CDT.
Other locations in the path of this tornadic thunderstorm include
Roscoe.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4249 8894 4237 8894 4239 8922 4250 8923
TIME...MOT...LOC 1825Z 267DEG 22KT 4247 8912
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
MDB140
WWUS53 KLOT 071851
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
151 PM CDT Wed Jul 7 2021
ILC201-071858-
/O.CAN.KLOT.TO.W.0022.000000T0000Z-210707T1900Z/
Winnebago IL-
151 PM CDT Wed Jul 7 2021
...THE TORNADO WARNING FOR NORTHEASTERN WINNEBAGO COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has weakened.
However thunderstorms with heavy rain continue from Rockton to Loves
Park.
LAT...LON 4249 8894 4237 8894 4239 8922 4250 8923
TIME...MOT...LOC 1847Z 269DEG 23KT 4247 8891
$$
MDBThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 12:26 PM CDT | Special Weather Statement | LOT | Kankakee | 94 min |
| Jul 7, 4:28 PM CDT | Marine Dense Fog Advisory | LOT | 6 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.