Alert archive / Illinois / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 3, NWS Lincoln, IL

April 20, 2004McLean County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Apr 20, 2004, 5:55 PM CDT for McLean County, Illinois. It was in force for 35 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: Apr 20, 2004, 5:55 PM CDT (22:55 UTC)
Expired: Apr 20, 2004, 6:30 PM CDT
In force: 35 min
Issued by: NWS Lincoln, IL
Area: Counties, with a storm outline in the text

County McLean County, IL

What was reported inside it

Time	Report	Where	Remark
Apr 20, 6:00 PM CDT	HAIL 0.88	Anchor, IL
Apr 20, 6:00 PM CDT	HAIL 0.88	Anchor, 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 20, 5:40 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 45 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: 1297 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 169 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.

292 
WUUS53 KILX 202255
SVRILX
ILC113-202330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
555 PM CDT TUE APR 20 2004

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MCLEAN COUNTY IN CENTRAL ILLINOIS

* UNTIL 630 PM CDT

* AT 555 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTH OF ANCHOR...OR ABOUT 10 MILES
  WEST OF GIBSON CITY...MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ANCHOR
  CROPSEY

THIS STORM IS CAPABLE OF PRODUCING WINDS IN EXCESS OF 60 
MPH...DAMAGING HAIL...AND VERY HEAVY RAIN. TAKE SHELTER IN A STURDY 
BUILDING AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES AT ANY TIME.

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 4054 8865 4044 8853 4059 8838 4063 8851

$$

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 2:30 PM CDT	Tornado Warning	ILX	Champaign	45 min
Apr 20, 4:42 PM CDT	Severe Thunderstorm Warning	ILX	Mason	63 min
Apr 20, 5:11 PM CDT	Tornado Warning	ILX	Marshall	64 min
Apr 20, 5:14 PM CDT	Severe Thunderstorm Warning	ILX	Tazewell	61 min
Apr 20, 5:27 PM CDT	Tornado Warning	ILX	Tazewell	63 min
Apr 20, 5:49 PM CDT	Tornado Warning	ILX	Knox, Stark	41 min
Apr 20, 5:51 PM CDT	Tornado Warning	ILX	Marshall	9 min
Apr 20, 5:55 PM CDT	Tornado Warning	ILX	Marshall	35 min
Apr 20, 6:05 PM CDT	Tornado Warning	ILX	Woodford	55 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2004 Every severe thunderstorm warning in 2004

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.