Alert archive / Illinois / Tornado Warnings in 2011

Tornado Warning 9, NWS Chicago, IL

May 22, 20114 counties in Illinois

NWS Chicago, IL issued this tornado warning at May 22, 2011, 6:37 PM CDT for 4 counties in Illinois. It was in force for 38 min. 28 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 22, 2011, 6:37 PM CDT (23:37 UTC)
Expired: May 22, 2011, 7:15 PM CDT
In force: 38 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon

Counties Boone County, IL, DeKalb County, IL, Ogle County, IL, Winnebago County, IL

The radar

The Milwaukee radar (KMKX), 89 km from the middle of the area, began a volume at 23:38 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 22, 6:40 PM CDT	TORNADO	2 N Stillman Valley, IL	TORNADO BEGAN 2.9 MILES NORTH OF STILLMAN VALLEY AT MERIDIAN ROAD AND STILLMAN VALLEY ROAD. IT CONTINUED EAST FOR ABOUT HALF A MILE. IT WAS RATED EF1 WITH A WIDTH OF UP TO 100 YARDS.
May 22, 6:43 PM CDT	TSTM WND DMG	Winnebago, IL	NUMEROUS 1 FOOT DIAMETER TREES DOWN
May 22, 6:49 PM CDT	TSTM WND DMG	Rockford, IL	SEVERAL 4-5 INCH DIAMETER TREE BRANCHES DOWN.
May 22, 6:49 PM CDT	TSTM WND GST 70	Rockford, IL	ALPINE ROAD AND HARRISON AVENUE IN SOUTHEAST ROCKFORD.
May 22, 6:49 PM CDT	HAIL 0.75	Rockford, IL	IN SOUTHWEST ROCKFORD.
May 22, 6:50 PM CDT	TSTM WND DMG	Rockford, IL	* 1 INJ * TREE FELL ONTO HOUSE ON CROSBY STREET. RELAYED BY WREX.
May 22, 6:50 PM CDT	TSTM WND DMG	Winnebago, IL	LARGE TREE BRANCHES DOWN AND DEBRIS FLYING THROUGH THE AIR OUTSIDE WREX STUDIOS.
May 22, 6:50 PM CDT	TSTM WND GST 0	Rockford, IL	NEAR I-90 AND BUS US-20.
May 22, 6:50 PM CDT	TSTM WND GST 50	Rockford, IL	SEVERAL SMALL TREE BRANCHES/LIMBS DOWN IN EAST CENTRAL ROCKFORD
May 22, 6:50 PM CDT	TSTM WND GST 75	Rockford, IL	NEAR I-90 AND BUS US-20.
May 22, 6:50 PM CDT	HAIL 0.88	Stillman Valley, IL	JUST NORTH OF TOWN ALONG STILLMAN VALLEY ROAD. ALSO ESTIMATED 45-50 MPH WIND GUSTS.
May 22, 6:50 PM CDT	HAIL 1	Rockford, IL	HUFFMAN BLVD AND AUBURN ST.
May 22, 6:53 PM CDT	HAIL 1	4 Nw Rockford, IL	NICKEL TO QUARTER SIZE
May 22, 6:54 PM CDT	TSTM WND DMG	Machesney Park, IL	TREE LIMBS DOWN. SMALL HAM RADIO TOWERS DOWN.
May 22, 6:54 PM CDT	TSTM WND GST 61	Rockford Airport, IL
May 22, 6:55 PM CDT	TSTM WND GST 70	Rockford, IL	EAST SIDE OF ROCKFORD
May 22, 6:55 PM CDT	HAIL 1	4 Ssw Loves Park, IL	COCORAHS OBSERVER. DELAYED REPORT.
May 22, 6:56 PM CDT	HAIL 0.75	Rockford, IL	IN EAST CENTRAL ROCKFORD.
May 22, 6:56 PM CDT	HAIL 1	Rockford, IL	ALPINE ROAD AND HARRISON ROAD IN SOUTHEAST ROCKFORD.
May 22, 6:58 PM CDT	TSTM WND DMG	Roscoe, IL	FLAGPOLE AT DAIRY QUEEN BENT IN HALF. RELAYED BY WREX.
May 22, 7:00 PM CDT	TSTM WND DMG	Roscoe, IL	POSSIBLE TORNADO. DAMAGE NOTED TO ROSCOE FD AND TRAINING FACILITY. MULTIPLE FIREFIGHTERS WITNESSED FUNNEL CLOUD PRIOR. ASST.
May 22, 7:00 PM CDT	HAIL 1.25	Rockford, IL	COURT AND JOHN ST. NORTH OF DOWNTOWN.
May 22, 7:00 PM CDT	HAIL 1.5	Rockford, IL
May 22, 7:04 PM CDT	TSTM WND DMG	Belvidere, IL	SMALL TREE BRANCHES BLOWN DOWN. ESTIMATED WIND GUSTS ABOUT 50 MPH.
May 22, 7:04 PM CDT	TSTM WND DMG	Poplar Grove, IL	TREES AND WIRES DOWN ALL ACROSS NORTHERN PORTION OF COUNTY.
May 22, 7:09 PM CDT	TSTM WND GST 60	Roscoe, IL	PEA SIZED HAIL AND TREE LIMBS DOWN.
May 22, 7:10 PM CDT	HAIL 1	Belvidere, IL	NEAR I90 AND US 20. 1/4 MI E OF CHRYSLER PLANT.
May 22, 7:14 PM CDT	HAIL 0.25	Belvidere, IL

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
May 22, 2:04 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.6 hours before the alert went out and 136 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1775 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 287 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.

273 
WFUS53 KLOT 222337
TORLOT
ILC007-037-141-201-230015-
/O.NEW.KLOT.TO.W.0009.110522T2337Z-110523T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
637 PM CDT SUN MAY 22 2011

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARNING FOR...
  BOONE COUNTY...
  NORTHWESTERN DE KALB COUNTY...
  OGLE COUNTY...
  WINNEBAGO COUNTY...

* UNTIL 715 PM CDT

* AT 634 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE SQUALL LINE CAPABLE OF PRODUCING RAIN-WRAPPED
  TORNADOES IN ADDITION TO WIDESPREAD STRAIGHT LINE WIND DAMAGE.
  THESE DANGEROUS STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  RIDOTT TO GERMAN VALLEY TO 5 MILES WEST OF BYRON TO MOUNT MORRIS...
  AND MOVING EAST AT 60 MPH.

* THESE STORMS WILL BE NEAR...
  WINNEBAGO...STILLMAN VALLEY AND ROCKFORD AIRPORT AROUND 645 PM.
  ROCKFORD AROUND 650 PM.
  ROCKTON...MACHESNEY PARK...LOVES PARK AND CHERRY VALLEY AROUND 655
  PM.
  ROSCOE...SOUTH BELOIT AND BELVIDERE AROUND 700 PM.
  POPLAR GROVE AND KIRKLAND AROUND 705 PM.

OTHER LOCATIONS IMPACTED BY THESE TORNADIC THUNDERSTORMS INCLUDE NEW
MILLFORD AND DAVIS JUNCTION.

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 4249 8882 4239 8874 4223 8876 4207 8883
      4196 8951 4211 8944 4220 8948 4221 8940
      4239 8940 4243 8931 4250 8902
TIME...MOT...LOC 2337Z 255DEG 54KT 4232 8943 4224 8934
          4214 8930 4200 8939

$$

IZZI

4 follow-up statements

571 
WWUS53 KLOT 222348
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
648 PM CDT SUN MAY 22 2011

ILC007-037-141-201-230015-
/O.CON.KLOT.TO.W.0009.000000T0000Z-110523T0015Z/
OGLE IL-WINNEBAGO IL-BOONE IL-DE KALB IL-
648 PM CDT SUN MAY 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN DE KALB...
BOONE...WINNEBAGO AND OGLE COUNTIES UNTIL 715 PM CDT...

AT 646 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE SQUALL LINE CAPABLE OF PRODUCING DAMAGING STRAIGHT LINE WINDS 
IN EXCESS OF 90 MPH AND RAIN-WRAPPED TORNADOES.  THESE DANGEROUS 
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES SOUTHEAST OF 
DURAND TO WINNEBAGO TO ROCKFORD AIRPORT TO 5 MILES SOUTH OF STILLMAN 
VALLEY...MOVING EAST AT 60 MPH.

THESE DANGEROUS STORMS WILL BE NEAR...
  ROCKTON...MACHESNEY PARK...LOVES PARK AND CHERRY VALLEY AROUND 655
  PM CDT.
  SOUTH BELOIT...ROSCOE AND BELVIDERE AROUND 700 PM CDT.
  POPLAR GROVE AND KIRKLAND AROUND 705 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 4249 8882 4239 8874 4223 8876 4207 8883
      4196 8951 4211 8944 4220 8948 4221 8940
      4239 8940 4243 8931 4250 8902
TIME...MOT...LOC 2347Z 255DEG 54KT 4238 8923 4227 8914
          4217 8910 4203 8919

$$

IZZI

993 
WWUS53 KLOT 222357
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
657 PM CDT SUN MAY 22 2011

ILC007-037-141-201-230015-
/O.CON.KLOT.TO.W.0009.000000T0000Z-110523T0015Z/
OGLE IL-WINNEBAGO IL-BOONE IL-DE KALB IL-
657 PM CDT SUN MAY 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN DE KALB...
BOONE...WINNEBAGO AND NORTHEASTERN OGLE COUNTIES UNTIL 715 PM CDT...

AT 656 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE SQUALL LINE CAPABLE OF PRODUCING DAMAGING STRAIGHT LINE WINDS
AND RAIN-WRAPPED TORNADOES.  THESE DANGEROUS STORMS WERE LOCATED 
ALONG A LINE EXTENDING FROM SOUTH BELOIT TO LOVES PARK TO
CHERRY VALLEY TO 8 MILES NORTH OF HILLCREST...MOVING EAST AT 60 MPH.

THESE DANGEROUS STORMS WILL BE NEAR...
  POPLAR GROVE AND KIRKLAND AROUND 705 PM CDT.

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 4249 8882 4239 8874 4223 8876 4207 8883
      4201 8923 4212 8919 4222 8925 4227 8928
      4239 8940 4243 8931 4250 8902
TIME...MOT...LOC 2357Z 255DEG 54KT 4250 8906 4230 8894
          4220 8890 4206 8899

$$

IZZI

363 
WWUS53 KLOT 230006
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
706 PM CDT SUN MAY 22 2011

ILC007-037-141-201-230015-
/O.CON.KLOT.TO.W.0009.000000T0000Z-110523T0015Z/
OGLE IL-WINNEBAGO IL-BOONE IL-DE KALB IL-
706 PM CDT SUN MAY 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN DE KALB...
BOONE...EASTERN WINNEBAGO AND EAST CENTRAL OGLE COUNTIES UNTIL 715 PM
CDT...

AT 704 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE SQUALL LINE CAPABLE OF PRODUCING DAMAGING STRAIGHT LINE WINDS
AND RAIN-WRAPPED TORNADOES.  THESE DANGEROUS STORMS WERE LOCATED 
ALONG A LINE EXTENDING FROM CLINTON TO POPLAR GROVE TO BELVIDERE TO 
KIRKLAND...MOVING EAST AT 60 MPH.

THIS LINE OF TORNADO PRODUCING STORMS WILL AFFECT MAINLY RURAL AREAS
OF BOONE...EAST CENTRAL OGLE...EASTERN WINNEBAGO AND NORTHWESTERN DE
KALB COUNTIES.

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 4249 8882 4239 8874 4223 8876 4207 8883
      4204 8907 4226 8903 4237 8905 4244 8925
      4250 8902
TIME...MOT...LOC 0007Z 255DEG 54KT 4254 8886 4234 8874
          4224 8870 4210 8879

$$

IZZI

185 
WWUS53 KLOT 230015
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
715 PM CDT SUN MAY 22 2011

ILC007-037-141-201-230025-
/O.EXP.KLOT.TO.W.0009.000000T0000Z-110523T0015Z/
OGLE IL-WINNEBAGO IL-BOONE IL-DE KALB IL-
715 PM CDT SUN MAY 22 2011

...THE TORNADO WARNING FOR NORTHWESTERN DE KALB...BOONE...EASTERN
WINNEBAGO AND EAST CENTRAL OGLE COUNTIES HAS EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
WARNED AREA. A TORNADO WARNING REMAINS IN EFFECT FOR EASTERN BOONE 
COUNTY.

LAT...LON 4249 8882 4239 8874 4223 8876 4207 8883
      4204 8907 4226 8903 4237 8905 4244 8925
      4250 8902
TIME...MOT...LOC 0006Z 255DEG 54KT 4253 8887 4233 8876
          4223 8872 4209 8881

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 2:01 AM CDT	Marine Dense Fog Advisory	LOT		3 hr
May 22, 2:26 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Livingston	34 min
May 22, 3:00 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Grundy, Iroquois, Kankakee, Livingston	60 min
May 22, 3:08 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	67 min
May 22, 3:12 PM CDT	Special Marine Warning	LOT		63 min
May 22, 3:16 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Lake	19 min
May 22, 3:21 PM CDT	Special Marine Warning	LOT		114 min
May 22, 3:21 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	54 min
May 22, 3:23 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	38 min
May 22, 3:27 PM CDT	Special Marine Warning	LOT		2 hr
May 22, 3:28 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Kankakee, Livingston	77 min
May 22, 4:12 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	78 min
May 22, 4:22 PM CDT	Areal Flood Advisory	LOT	Kankakee, Will	3 hr
May 22, 4:31 PM CDT	Flash Flood Warning	LOT	Livingston	3 hr
May 22, 4:38 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois	67 min
May 22, 4:47 PM CDT	Flash Flood Warning	LOT	Ford, Iroquois	5 hr
May 22, 4:47 PM CDT	Special Weather Statement	LOT	Winnebago	28 min
May 22, 4:51 PM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	39 min
May 22, 5:08 PM CDT	Flash Flood Warning	LOT	Iroquois, Kankakee	4 hr
May 22, 5:13 PM CDT	Severe Thunderstorm Warning	LOT	Boone, Ogle, Winnebago	47 min
May 22, 5:51 PM CDT	Severe Thunderstorm Warning	LOT	Ogle, Winnebago	25 min
May 22, 6:18 PM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Lee, Ogle, Winnebago	50 min
May 22, 6:54 PM CDT	Tornado Warning	LOT	Boone, DeKalb, McHenry	51 min
May 22, 6:56 PM CDT	Special Marine Warning	LOT		2 hr

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.