Alert archive / Illinois / Tornado Warnings in 2011
Tornado Warning 20, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Jun 21, 2011, 7:27 PM CDT for LaSalle County, Livingston County, Illinois. It was in force for 33 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
- Jun 21, 2011, 7:27 PM CDT (00:27 UTC)
- Expired
- Jun 21, 2011, 8:00 PM CDT
- In force
- 33 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
Counties LaSalle County, IL, Livingston County, IL
The radar
The Chicago radar (KLOT), 95 km from the middle of the area, began a volume at 00:30 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 |
|---|---|---|---|
| Jun 21, 5:42 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.5 hours before the alert went out and 95 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
- 3122 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 829 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 207 m²/s²
- Significant tornado parameter
- 3.5
- Supercell composite
- 15.3
The text
As transmitted, in the capitals the NWS used until 2016.
500
WFUS53 KLOT 220027
TORLOT
ILC099-105-220100-
/O.NEW.KLOT.TO.W.0020.110622T0027Z-110622T0100Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
727 PM CDT TUE JUN 21 2011
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN LA SALLE COUNTY...
NORTHWESTERN LIVINGSTON COUNTY...
* UNTIL 800 PM CDT
* AT 725 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR MINONK...OR 16 MILES SOUTHWEST OF
STREATOR...AND MOVING NORTHEAST AT 30 MPH.
* LOCATIONS IMPACTED INCLUDE...
STREATOR...DANA...LONG POINT...CORNELL...KANGLEY AND RANSOM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR
ROOM ON THE LOWEST FLOOR!
&&
LAT...LON 4080 8891 4081 8894 4092 8894 4092 8905
4093 8905 4096 8906 4126 8879 4114 8858
4111 8859 4111 8857
TIME...MOT...LOC 0027Z 217DEG 27KT 4093 8894
$$
IZZI3 follow-up statements
709
WWUS53 KLOT 220036
SVSLOT
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
736 PM CDT TUE JUN 21 2011
ILC099-105-220100-
/O.CON.KLOT.TO.W.0020.000000T0000Z-110622T0100Z/
LA SALLE IL-LIVINGSTON IL-
736 PM CDT TUE JUN 21 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN LIVINGSTON
AND SOUTHEASTERN LA SALLE COUNTIES UNTIL 800 PM CDT...
AT 734 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 8 MILES NORTH OF FLANAGAN...OR 10 MILES SOUTHWEST
OF STREATOR...MOVING NORTHEAST AT 35 MPH.
LOCATIONS IMPACTED INCLUDE...
STREATOR...CORNELL...KANGLEY AND RANSOM.
LAT...LON 4080 8891 4081 8894 4092 8894 4092 8905
4093 8905 4096 8906 4126 8879 4114 8858
4111 8859 4111 8857
TIME...MOT...LOC 0036Z 206DEG 29KT 4101 8890
$$
BIRK793
WWUS53 KLOT 220048
SVSLOT
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
748 PM CDT TUE JUN 21 2011
ILC099-105-220100-
/O.CON.KLOT.TO.W.0020.000000T0000Z-110622T0100Z/
LA SALLE IL-LIVINGSTON IL-
748 PM CDT TUE JUN 21 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN LIVINGSTON
AND SOUTHEASTERN LA SALLE COUNTIES UNTIL 800 PM CDT...
AT 743 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR STREATOR...MOVING NORTHEAST AT 45 MPH.
LOCATIONS IMPACTED INCLUDE...
RANSOM.
LAT...LON 4126 8879 4114 8858 4111 8859 4111 8857
4088 8882 4098 8904
TIME...MOT...LOC 0048Z 213DEG 41KT 4117 8874
$$
BIRK574
WWUS53 KLOT 220100
SVSLOT
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
800 PM CDT TUE JUN 21 2011
ILC099-105-220110-
/O.EXP.KLOT.TO.W.0020.000000T0000Z-110622T0100Z/
LA SALLE IL-LIVINGSTON IL-
800 PM CDT TUE JUN 21 2011
...THE TORNADO WARNING FOR NORTHWESTERN LIVINGSTON AND SOUTHEASTERN
LA SALLE COUNTIES HAS EXPIRED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4126 8879 4114 8858 4111 8859 4111 8857
4088 8882 4098 8904
TIME...MOT...LOC 0100Z 213DEG 41KT 4128 8864
$$The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 7:17 PM CDT | Special Weather Statement | LOT | Ford, Iroquois, Livingston | |
| Jun 21, 7:19 PM CDT | Special Marine Warning | LOT | 3 hr | |
| Jun 21, 7:22 PM CDT | Severe Thunderstorm Warning | LOT | McHenry | 23 min |
| Jun 21, 7:23 PM CDT | Special Weather Statement | LOT | Ford, Iroquois, Kankakee, Will | 67 min |
| Jun 21, 7:31 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, DuPage, Grundy, Kane, Kendall, LaSalle and 2 more | 37 min |
| Jun 21, 7:57 PM CDT | Tornado Warning | LOT | Cook, DeKalb, DuPage, Grundy, Kane, Kendall and 1 more | 63 min |
| Jun 21, 8:01 PM CDT | Areal Flood Advisory | LOT | LaSalle | 6 hr |
| Jun 21, 8:22 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Lake, McHenry, Will | 53 min |
| Jun 21, 8:38 PM CDT | Tornado Warning | LOT | Cook, DuPage, Lake | 52 min |
| Jun 21, 9:19 PM CDT | Areal Flood Advisory | LOT | DeKalb, Grundy, Kane, Kendall, LaSalle | 6 hr |
| Jun 22, 9:58 AM CDT | Small Craft Advisory | LOT | 12 hr | |
| Jun 22, 11:19 AM CDT | River Flood Advisory | LOT | LaSalle | 17 hr |
Nearby
Tornado Warnings in Illinois, 2011Every tornado warning in 2011Tornadoes in 2011
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.