Alert archive / Illinois / Tornado Warnings in 2004

Tornado Warning 37, NWS Quad Cities, IA

July 5, 2004Bureau County, Henry County, Illinois

NWS Quad Cities, IA issued this tornado warning at Jul 5, 2004, 9:40 PM CDT for Bureau County, Henry County, Illinois. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 5, 2004, 9:40 PM CDT (02:40 UTC)
Expired: Jul 5, 2004, 10:30 PM CDT
In force: 50 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

Counties Bureau County, IL, Henry County, IL

The radar

The Quad Cities radar (KDVN), 74 km from the middle of the area, began a volume at 02:40 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 5, 4:20 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.7 hours before the alert went out and 68 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: 1346 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1014 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDVN 060240
TORDVN
ILC011-073-060330-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
939 PM CDT MON JUL 5 2004

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  BUREAU COUNTY IN NORTH CENTRAL ILLINOIS
  EASTERN HENRY COUNTY IN NORTHWEST ILLINOIS

* UNTIL 1030 PM CDT

* AT 935 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM LIKELY TO PRODUCE A TORNADO NEAR  
  KEWANEE...MOVING NORTHEAST AT 40 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  SHEFFIELD BY 950 PM CDT
  MANLIUS BY 1000 PM CDT
  7 MILES NORTHWEST OF PRINCETON AND 7 MILES SOUTHEAST OF WALNUT 
    BY 1010 PM CDT

DAMAGING STRAIGHT-LINE WINDS ARE LIKELY IN ADDITION TO TORNADOES.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT MONDAY EVENING
FOR WEST CENTRAL ILLINOIS. A TORNADO WATCH ALSO REMAINS IN EFFECT
UNTIL 1000 PM CDT MONDAY EVENING FOR EASTERN IOWA AND NORTHWESTERN
ILLINOIS.

LAT...LON 4132 9014 4118 9001 4124 8987 4128 8950
      4145 8917 4158 8958

$$

LRE

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 5, 8:14 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island	46 min
Jul 5, 8:55 PM CDT	Tornado Warning	DVN	Henry	35 min
Jul 5, 9:07 PM CDT	Tornado Warning	DVN	Whiteside	38 min

Nearby

Tornado Warnings in Illinois, 2004 Every tornado warning in 2004 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.