Alert archive / Illinois / Tornado Warnings in 2015

Tornado Warning 21, NWS Chicago, IL

June 22, 2015LaSalle County, Lee County, Illinois

NWS Chicago, IL issued this tornado warning at Jun 22, 2015, 8:03 PM CDT for LaSalle County, Lee County, Illinois. It was in force for 42 min. 7 reports 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: Jun 22, 2015, 8:03 PM CDT (01:03 UTC)
Expired: Jun 22, 2015, 8:45 PM CDT
In force: 42 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties LaSalle County, IL, Lee County, IL

The radar

The Chicago radar (KLOT), 85 km from the middle of the area, began a volume at 01:06 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
Jun 22, 8:19 PM CDT	TSTM WND DMG	3 E Sublette, IL	1 FT. DIAMETER TREE SNAPPED AT BASE. LEE-LASALLE COUNTY LINE ON RTE 251
Jun 22, 8:19 PM CDT	TSTM WND GST 60	3 E Sublette, IL	ZERO VISIBILITY WITH 60 MPH GUST AT RTE 251 ON THE LEE-LASALLE COUNTY LINE
Jun 22, 8:19 PM CDT	TORNADO	1 Wnw Mendota, IL	EF-1 TORNADO WITH PEAK WINDS OF 105 MPH AND PATH LENGTH OF 1.5 MILES. THIS TORNADO CROSSED THROUGH THE CENTER OF MENDOTA PRODUCING SIGNIFICANT TREE DAMAGE. SOME OF THESE TREES CAME DOWN ON STRUCTURES INCLUDING AT LEAST ONE ON A VEHICLE. ENDING TIME OF 819 PM.
Jun 22, 8:23 PM CDT	TSTM WND DMG	1 Nnw Mendota, IL	OUTBUILDING DAMAGED ALONG ILLINOIS HIGHWAY 251. A FEW TREES AND LARGE BRANCHES DOWNED IN RESTLAND CEMETARY. RADAR IMAGERY AND REPORTS INDICATE THIS WAS LIKELY STRAIGHT-LINE WINDS AROUND 80 MPH. TIME ESTIMATED.
Jun 22, 8:35 PM CDT	TSTM WND DMG	Mendota, IL	DAMAGE TO MEDICAL BUILDING AT MEMORIAL DR, RTE251/52
Jun 22, 8:35 PM CDT	TSTM WND DMG	Mendota, IL	NUMEROUS TREES DOWN, IL-251/US-52. CORRECTION TO PREVIOUS REPORT
Jun 22, 8:35 PM CDT	TORNADO	4 Se Mendota, IL	IN TRIUMPH TORNADO ON GROUND.

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
Jun 22, 3:56 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.1 hours before the alert went out and 116 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1958 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 925 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 401 m²/s²
0-3 km storm-relative helicity: 441 m²/s²
Significant tornado parameter: 5.7
Supercell composite: 17.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

994 
WFUS53 KLOT 230103
TORLOT
ILC099-103-230145-
/O.NEW.KLOT.TO.W.0021.150623T0103Z-150623T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
803 PM CDT MON JUN 22 2015

THE NATIONAL WEATHER SERVICE IN CHICAGO  HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN LA SALLE COUNTY IN NORTH CENTRAL ILLINOIS...
  SOUTHEASTERN LEE COUNTY IN NORTH CENTRAL ILLINOIS...

* UNTIL 845 PM CDT
    
* AT 803 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR AMBOY...OR 9 MILES NORTHWEST OF 
  MENDOTA... MOVING SOUTHEAST AT 30 MPH. THIS STORM HAS A HISTORY OF 
  PRODUCING SIGNIFICANT DAMAGE. 

  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...
  MENDOTA AROUND 825 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
COMPTON...WEST BROOKLYN AND TROY GROVE.

THIS INCLUDES... TRI-COUNTY FAIRGROUNDS.
 
INCLUDING THE FOLLOWING INTERSTATE...
 I-39 BETWEEN MILE MARKERS 64 AND 84.
 
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 4177 8915 4170 8894 4138 8896 4149 8917
      4158 8917 4159 8919
TIME...MOT...LOC 0103Z 298DEG 25KT 4164 8927 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

BIRK

3 follow-up statements

217 
WWUS53 KLOT 230111
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
811 PM CDT MON JUN 22 2015

ILC099-103-230145-
/O.CON.KLOT.TO.W.0021.000000T0000Z-150623T0145Z/
LA SALLE IL-LEE IL-
811 PM CDT MON JUN 22 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR
NORTHWESTERN LA SALLE AND SOUTHEASTERN LEE COUNTIES...
    
AT 810 PM CDT...A CONFIRMED TORNADO WAS LOCATED JUST SOUTHEAST OF 
SUBLETTE...MOVING SOUTHEAST 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. 

THIS TORNADO WILL BE NEAR...
  MENDOTA AROUND 830 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
COMPTON...WEST BROOKLYN AND TROY GROVE.

THIS INCLUDES... TRI-COUNTY FAIRGROUNDS.
 
INCLUDING THE FOLLOWING INTERSTATE...
 I-39 BETWEEN MILE MARKERS 64 AND 84.
 
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.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

&&

LAT...LON 4177 8915 4170 8894 4138 8896 4149 8917
      4158 8917 4159 8919
TIME...MOT...LOC 0110Z 293DEG 20KT 4162 8920 

TORNADO...OBSERVED
HAIL...<.75IN

$$

BIRK

825 
WWUS53 KLOT 230124
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
824 PM CDT MON JUN 22 2015

ILC099-103-230145-
/O.CON.KLOT.TO.W.0021.000000T0000Z-150623T0145Z/
LA SALLE IL-LEE IL-
824 PM CDT MON JUN 22 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR
NORTHWESTERN LA SALLE AND SOUTHEASTERN LEE COUNTIES...
    
AT 823 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 
WAS LOCATED OVER MENDOTA...MOVING EAST AT 25 MPH. THIS STORM HAS A 
HISTORY OF PRODUCING A TORNADO. 

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
NORTHWESTERN LA SALLE AND SOUTHEASTERN LEE COUNTIES...INCLUDING THE
FOLLOWING LOCATIONS...COMPTON...WEST BROOKLYN AND TROY GROVE.

THIS INCLUDES... TRI-COUNTY FAIRGROUNDS.
 
INCLUDING THE FOLLOWING INTERSTATE...
 I-39 BETWEEN MILE MARKERS 64 AND 83.
 
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.

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4173 8916 4170 8894 4138 8896 4149 8917
      4158 8917 4159 8919
TIME...MOT...LOC 0123Z 291DEG 21KT 4159 8912 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

BIRK

422 
WWUS53 KLOT 230130
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
830 PM CDT MON JUN 22 2015

ILC103-230140-
/O.CAN.KLOT.TO.W.0021.000000T0000Z-150623T0145Z/
LEE IL-
830 PM CDT MON JUN 22 2015

...THE TORNADO WARNING FOR SOUTHEASTERN LEE 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 1100 PM CDT FOR NORTH CENTRAL
ILLINOIS.

LAT...LON 4161 8917 4162 8915 4162 8896 4138 8896
      4149 8917
TIME...MOT...LOC 0130Z 312DEG 23KT 4154 8908 

$$

ILC099-230145-
/O.CON.KLOT.TO.W.0021.000000T0000Z-150623T0145Z/
LA SALLE IL-
830 PM CDT MON JUN 22 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR
NORTHWESTERN LA SALLE COUNTY...
    
AT 830 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER MENDOTA...MOVING SOUTHEAST 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. 

LOCATIONS IMPACTED INCLUDE...
MENDOTA AND TROY GROVE. 

THIS INCLUDES... TRI-COUNTY FAIRGROUNDS.
 
INCLUDING THE FOLLOWING INTERSTATE...
 I-39 BETWEEN MILE MARKERS 64 AND 76.
 
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.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4161 8917 4162 8915 4162 8896 4138 8896
      4149 8917
TIME...MOT...LOC 0130Z 312DEG 23KT 4154 8908 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

RODRIGUEZ

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 7:03 PM CDT	Tornado Warning	LOT	Lee	57 min
Jun 22, 7:30 PM CDT	Flash Flood Warning	LOT	LaSalle, Lee, Ogle	6 hr
Jun 22, 7:35 PM CDT	Tornado Warning	LOT	Lee	40 min
Jun 22, 8:38 PM CDT	Tornado Warning Tornado observed	LOT	LaSalle	37 min
Jun 22, 8:59 PM CDT	Flash Flood Warning	LOT	DeKalb, Grundy, Kendall, LaSalle, Lee	3 hr
Jun 22, 9:06 PM CDT	Tornado Warning Tornado observed	LOT	Grundy, LaSalle	39 min
Jun 22, 9:28 PM CDT	Tornado Warning	LOT	Grundy	47 min
Jun 22, 9:38 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Kankakee, Will	37 min
Jun 22, 9:53 PM CDT	Tornado Warning Tornado observed	LOT	Grundy, Kankakee, Will	32 min
Jun 22, 10:05 PM CDT	Flash Flood Warning	LOT	Grundy, Kendall, Will	7 hr
Jun 22, 10:09 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois, Kankakee, Will	66 min
Jun 22, 10:12 PM CDT	Tornado Warning	LOT	Kankakee	18 min
Jun 22, 10:37 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kankakee, LaSalle, Livingston, Will	53 min
Jun 22, 10:39 PM CDT	Flash Flood Warning	LOT	Grundy, Iroquois, Kankakee, Livingston, Will	8 hr
Jun 22, 11:17 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Kankakee, Livingston	43 min
Jun 22, 11:22 PM CDT	Flash Flood Warning Emergency	LOT	Kankakee	7 hr
Jun 22, 11:23 PM CDT	Tornado Warning	LOT	Ford, Iroquois, Kankakee, Livingston	37 min
Jun 22, 11:34 PM CDT	River Flood Warning	LOT	LaSalle	46 hr
Jun 22, 11:43 PM CDT	Tornado Warning	LOT	Iroquois, Kankakee	26 min
Jun 22, 11:50 PM CDT	Areal Flood Warning	LOT	DeKalb, Grundy, Kendall, LaSalle, Lee	6 hr
Jun 23, 3:30 AM CDT	River Flood Advisory	LOT	Grundy	36 hr
Jun 23, 4:54 AM CDT	Areal Flood Warning	LOT	Grundy, Kankakee, Kendall, LaSalle, Lee, Will	30 hr
Jun 23, 6:24 AM CDT	River Flood Warning	LOT	Grundy	25 hr
Jun 23, 3:08 PM CDT	Flash Flood Watch	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	44 hr

Nearby

Tornado Warnings in Illinois, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.