Alert archive / Illinois / Tornado Warnings in 2011

Tornado Warning 20, NWS Lincoln, IL

April 19, 2011Champaign County, Piatt County, Illinois

NWS Lincoln, IL issued this tornado warning at Apr 19, 2011, 7:17 PM CDT for Champaign County, Piatt County, Illinois. It was in force for 28 min. 4 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: Apr 19, 2011, 7:17 PM CDT (00:17 UTC)
Expired: Apr 19, 2011, 7:45 PM CDT
In force: 28 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon

Counties Champaign County, IL, Piatt County, IL

The radar

The Lincoln radar (KILX), 93 km from the middle of the area, began a volume at 00:16 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
Apr 19, 7:30 PM CDT	TSTM WND GST 65	2 W Mahomet, IL	60-65 MPH ESTIMATED NEAR CHAMPAIGN AND PIATT COUNTY LINE
Apr 19, 7:30 PM CDT	HAIL 1	Champaign, IL
Apr 19, 7:45 PM CDT	TSTM WND GST 74	St. Joseph, IL
Apr 19, 7:45 PM CDT	HAIL 0.5	Ogden, 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
Apr 19, 1:00 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.3 hours before the alert went out and 32 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: 2409 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 523 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 547 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 24.4

Open this sounding in Storm Lab

The text

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

435 
WFUS53 KILX 200017
TORILX
ILC019-147-200045-
/O.NEW.KILX.TO.W.0020.110420T0017Z-110420T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
717 PM CDT TUE APR 19 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* TORNADO WARNING FOR...
  CHAMPAIGN COUNTY IN EAST CENTRAL ILLINOIS...
  EAST CENTRAL PIATT COUNTY IN CENTRAL ILLINOIS...

* UNTIL 745 PM CDT.

* AT 712 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE SQUALL LINE CAPABLE OF PRODUCING BRIEF RAIN-WRAPPED
  TORNADOES IN ADDITION TO WIDESPREAD STRAIGHT LINE WIND DAMAGE. THIS
  DANGEROUS STORM WAS LOCATED NEAR WHITE HEATH. ANOTHER ROTATION WAS
  DETECTED NEAR IVESDALE. THE LINE OF STORMS WAS MOVING NORTHEAST AT 
  70 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CHAMPAIGN...RANTOUL...SEYMOUR...TOLONO...MAHOMET...LAKE OF THE
  WOODS...SAVOY...PHILO...URBANA...THOMASBORO...ST. JOSEPH...OGDEN...
  GIFFORD...WILLARD AIRPORT...FLATVILLE AND ROYAL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

THIS LINE OF THUNDERSTORMS IS CAPABLE OF PRODUCING TORNADOES AND
WIDESPREAD SIGNIFICANT WIND DAMAGE. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4012 8795 3989 8833 3988 8837 3988 8846
      3986 8847 4015 8859 4041 8794
TIME...MOT...LOC 0016Z 238DEG 59KT 4010 8848

$$

MILLER

1 follow-up statement

633 
WWUS53 KILX 200035
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
735 PM CDT TUE APR 19 2011

ILC147-200045-
/O.CAN.KILX.TO.W.0020.000000T0000Z-110420T0045Z/
PIATT IL-
735 PM CDT TUE APR 19 2011

...THE TORNADO WARNING FOR EAST CENTRAL PIATT COUNTY IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA. A TORNADO WATCH REMAINS IN EFFECT UNTIL 9 PM CDT.

LAT...LON 4012 8795 3996 8821 4022 8842 4041 8794
TIME...MOT...LOC 0035Z 238DEG 59KT 4028 8823 4016 8809
          4003 8809

$$

ILC019-200045-
/O.CON.KILX.TO.W.0020.000000T0000Z-110420T0045Z/
CHAMPAIGN IL-
735 PM CDT TUE APR 19 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CHAMPAIGN COUNTY UNTIL 745
PM CDT...

AT 731 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE SQUALL LINE CAPABLE OF PRODUCING DAMAGING STRAIGHT LINE WINDS
AND BRIEF RAIN-WRAPPED TORNADOES.  THESE DANGEROUS STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM LAKE OF THE WOODS TO URBANA TO
PHILO...MOVING NORTHEAST AT 70 MPH.

LOCATIONS IMPACTED INCLUDE...
  RANTOUL...ST. JOSEPH...GIFFORD...FLATVILLE AND ROYAL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF THUNDERSTORMS IS CAPABLE OF PRODUCING TORNADOES AND
WIDESPREAD SIGNIFICANT WIND DAMAGE. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4012 8795 3996 8821 4022 8842 4041 8794
TIME...MOT...LOC 0035Z 238DEG 59KT 4028 8823 4016 8809
          4003 8809

$$

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 7:00 PM CDT	Tornado Warning	ILX	Coles, Douglas, Moultrie, Piatt, Shelby	45 min
Apr 19, 7:02 PM CDT	Flash Flood Warning	ILX	Christian, Shelby	6 hr
Apr 19, 7:08 PM CDT	Flash Flood Warning	ILX	Marshall, Peoria, Stark, Tazewell, Woodford	6 hr
Apr 19, 7:15 PM CDT	Tornado Warning	ILX	Shelby	45 min
Apr 19, 7:26 PM CDT	Flash Flood Warning	ILX	Coles, Moultrie, Shelby	6 hr
Apr 19, 7:26 PM CDT	Tornado Warning	ILX	Champaign, Coles, Douglas	34 min
Apr 19, 7:45 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	30 min
Apr 19, 7:46 PM CDT	Severe Thunderstorm Warning	ILX	Edgar	29 min
Apr 19, 7:49 PM CDT	Severe Thunderstorm Warning	ILX	Champaign	26 min
Apr 19, 7:56 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Coles, Cumberland, Effingham, Shelby	49 min
Apr 19, 8:10 PM CDT	Tornado Warning	ILX	Vermilion	20 min
Apr 19, 8:13 PM CDT	Severe Thunderstorm Warning	ILX	Edgar	47 min
Apr 19, 8:14 PM CDT	Flash Flood Warning	ILX	Coles, Cumberland, Douglas	6 hr
Apr 19, 8:33 PM CDT	Flash Flood Warning	ILX	Clark, Coles, Edgar	6 hr
Apr 19, 8:46 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Crawford, Cumberland, Jasper	59 min
Apr 19, 8:52 PM CDT	Tornado Warning	ILX	Effingham, Shelby	38 min
Apr 19, 8:56 PM CDT	Flash Flood Warning	ILX	Effingham	6 hr
Apr 19, 9:13 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Coles, Cumberland, Edgar	47 min
Apr 19, 9:19 PM CDT	Severe Thunderstorm Warning	ILX	Clay, Effingham, Jasper, Richland	41 min
Apr 19, 9:27 PM CDT	River Flood Warning	ILX	Piatt	12 days
Apr 19, 9:40 PM CDT	River Flood Warning	ILX	Clay, Richland	18 days
Apr 19, 9:46 PM CDT	Tornado Warning	ILX	Crawford, Jasper, Lawrence, Richland	44 min
Apr 19, 9:51 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Crawford, Cumberland, Jasper	39 min
Apr 19, 9:53 PM CDT	Severe Thunderstorm Warning	ILX	Lawrence, Richland	27 min
Apr 19, 9:58 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Edgar	17 min
Apr 20, 5:44 AM CDT	River Flood Warning	ILX	Fulton, Knox	16 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.