Alert archive / Illinois / Tornado Warnings in 2011

Tornado Warning 8, NWS Chicago, IL

May 13, 2011DeKalb County, Illinois

NWS Chicago, IL issued this tornado warning at May 13, 2011, 1:30 PM CDT for DeKalb County, Illinois. It was in force for 45 min. 2 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: May 13, 2011, 1:30 PM CDT (18:30 UTC)
Expired: May 13, 2011, 2:15 PM CDT
In force: 45 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon

County DeKalb County, IL

The radar

The Chicago radar (KLOT), 57 km from the middle of the area, began a volume at 18:32 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
May 13, 1:30 PM CDT	TORNADO	4 Ne Shabbona, IL	LOCAL MEDIA RELAYED HOME VIDEO OF A TORNADO THAT TOUCHED DOWN JUST NORTHEAST OF SHABBONA AROUND 130PM.
May 13, 1:52 PM CDT	FUNNEL CLOUD	N Waterman, IL	NORTH OF WATERMAN AT INTERSECTION OF ROUTES 23 AND 30.

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, 6.5 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.

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: 32 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 1097 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -66 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

005 
WFUS53 KLOT 131830
TORLOT
ILC037-131915-
/O.NEW.KLOT.TO.W.0008.110513T1830Z-110513T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
130 PM CDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN DE KALB COUNTY...

* UNTIL 215 PM CDT

* AT 127 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR WATERMAN...OR NEAR SHABBONA...AND MOVING
  NORTHEAST AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HINCKLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4192 8867 4177 8860 4176 8860 4166 8884
      4183 8894
TIME...MOT...LOC 1831Z 246DEG 13KT 4178 8878

$$

BMD

4 follow-up statements

605 
WWUS53 KLOT 131841
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
141 PM CDT FRI MAY 13 2011

ILC037-131915-
/O.CON.KLOT.TO.W.0008.000000T0000Z-110513T1915Z/
DE KALB IL-
141 PM CDT FRI MAY 13 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN DE KALB COUNTY
UNTIL 215 PM CDT...

AT 140 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR WATERMAN...OR 7 MILES EAST OF SHABBONA...
MOVING NORTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  HINCKLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4177 8860 4176 8860 4166 8883 4166 8884
      4178 8889 4192 8867
TIME...MOT...LOC 1841Z 246DEG 13KT 4179 8874

$$

BMD

595 
WWUS53 KLOT 131852
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
152 PM CDT FRI MAY 13 2011

ILC037-131915-
/O.CON.KLOT.TO.W.0008.000000T0000Z-110513T1915Z/
DE KALB IL-
152 PM CDT FRI MAY 13 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN DE KALB COUNTY
UNTIL 215 PM CDT...

AT 149 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR WATERMAN...OR 7 MILES EAST OF SHABBONA...
MOVING EAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...
  HINCKLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4177 8860 4176 8860 4171 8880 4175 8884
      4180 8887 4183 8881 4192 8867
TIME...MOT...LOC 1852Z 256DEG 11KT 4178 8873

$$

BMD

107 
WWUS53 KLOT 131856
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
156 PM CDT FRI MAY 13 2011

ILC037-131915-
/O.CON.KLOT.TO.W.0008.000000T0000Z-110513T1915Z/
DE KALB IL-
156 PM CDT FRI MAY 13 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN DE KALB COUNTY
UNTIL 215 PM CDT...

AT 152 PM CDT...LAW ENFORCEMENT REPORTED A FUNNEL CLOUD. THIS STORM 
WAS LOCATED NEAR WATERMAN...OR 8 MILES EAST OF SHABBONA...MOVING 
EAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...
  HINCKLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4177 8860 4176 8860 4171 8880 4175 8884
      4180 8887 4183 8881 4192 8867
TIME...MOT...LOC 1856Z 256DEG 11KT 4178 8871

$$

BMD

795 
WWUS53 KLOT 131914
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
214 PM CDT FRI MAY 13 2011

ILC037-131923-
/O.EXP.KLOT.TO.W.0008.000000T0000Z-110513T1915Z/
DE KALB IL-
214 PM CDT FRI MAY 13 2011

...THE TORNADO WARNING FOR SOUTHERN DE KALB COUNTY WILL EXPIRE AT 215
PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY. THIS STORM STILL EXHIBITS BROAD AND WEAK ROTATION AND WILL 
NEED TO BE MONITORED FOR REDEVELOPMENT.

LAT...LON 4177 8860 4176 8860 4171 8880 4175 8884
      4180 8887 4183 8881 4192 8867
TIME...MOT...LOC 1913Z 256DEG 11KT 4179 8864

$$

BMD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 3:19 AM CDT	Small Craft Advisory	LOT		40 hr
May 13, 7:04 AM CDT	Areal Flood Advisory	LOT	Boone, Winnebago	6 hr
May 13, 12:35 PM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, McHenry	55 min
May 13, 12:35 PM CDT	Tornado Warning	LOT	Grundy, Kankakee, Will	40 min
May 13, 1:02 PM CDT	Areal Flood Advisory	LOT	Boone, DeKalb, McHenry	3 hr
May 13, 1:17 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Lee, Ogle	58 min
May 13, 1:26 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb	24 min
May 13, 1:33 PM CDT	Flash Flood Warning	LOT	Boone, DeKalb, LaSalle, Lee, McHenry, Ogle	6 hr
May 13, 1:45 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb	35 min

Nearby

Tornado Warnings in Illinois, 2011 Every tornado warning in 2011 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.