Alert archive / Illinois / Tornado Warnings in 2001

Tornado Warning 6, NWS Lincoln, IL

April 21, 2001McLean County, Illinois

NWS Lincoln, IL issued this tornado warning at Apr 21, 2001, 6:28 PM CDT for McLean County, Illinois. It was in force for 62 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Apr 21, 2001, 6:28 PM CDT (23:28 UTC)
Expired: Apr 21, 2001, 7:30 PM CDT
In force: 62 min
Issued by: NWS Lincoln, IL
Area: Whole counties; the outline is the Mesonet’s reconstruction

County McLean County, IL

The radar

The Lincoln radar (KILX), 52 km from the middle of the area, began a volume at 23:32 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
Apr 21, 6:43 PM CDT	Hail 1.5	Danvers, IL	Thunderstorm moved out of Tazewell County into McLean County. Dime to walnut size hail was reported in Danvers, with dime to half dollar size hail reported west and north of Bloomington/Normal.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 21, 6:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.5 hours before the alert went out and 58 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: 163 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 663 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 249 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KILX 212330
TORSPI
ILC113-220030-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
628 PM CDT SAT APR 21 2001

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* TORNADO WARNING FOR...
  MCLEAN COUNTY IN CENTRAL ILLINOIS

* UNTIL 730 PM CDT

* AT 628 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A TORNADO 7 MILES WEST OF DANVERS...NEAR MACKINAW...MOVING EAST AT 
  35 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  DANVERS
  CARLOCK
  NORMAL
  HUDSON
  BLOOMINGTON
  TOWANDA
  LEXINGTON
  COOKSVILLE

THIS STORM HAS ALSO HAD A HISTORY OF PRODUCING DAMAGING HAIL.

IF YOU ARE IN THE PATH OF THIS STORM...TAKE COVER IN A BASEMENT OR
INTERIOR ROOM ON THE LOWEST FLOOR. VEHICLES AND MOBILE HOMES SHOULD
BE ABANDONED FOR A SAFER SHELTER.

REPORT SEVERE WEATHER OR ANY STORM DAMAGE TO YOUR LOCAL ESDA...OR THE
NEAREST LAW ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER
SERVICE. STAY TUNED FOR LATER STATEMENTS.

LAT...LON 4059 8927 4044 8927 4045 8865 4071 8866

NNNN

$$
FRIEDERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 5:37 PM CDT	Severe Thunderstorm Warning	ILX	Woodford	38 min
Apr 21, 5:43 PM CDT	Severe Thunderstorm Warning	ILX	Tazewell	62 min
Apr 21, 6:03 PM CDT	Tornado Warning	ILX	Tazewell	42 min
Apr 21, 6:08 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Mason	52 min
Apr 21, 6:41 PM CDT	Severe Thunderstorm Warning	ILX	Tazewell	64 min

Nearby

Tornado Warnings in Illinois, 2001 Every tornado warning in 2001 Tornadoes in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.