Alert archive / Illinois / Tornado Warnings in 2004

Tornado Warning 42, NWS Quad Cities, IA

August 18, 2004Henderson County, Warren County, Illinois

NWS Quad Cities, IA issued this tornado warning at Aug 18, 2004, 6:44 PM CDT for Henderson County, Warren County, Illinois. It was in force for 61 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: Aug 18, 2004, 6:44 PM CDT (23:44 UTC)
Expired: Aug 18, 2004, 7:45 PM CDT
In force: 61 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

Counties Henderson County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 95 km from the middle of the area, began a volume at 23:43 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
Aug 18, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.7 hours before the alert went out and 97 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: 3 J/kg
Mixed-layer CIN: -230 J/kg
Mixed-layer LCL: 1075 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 139 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.

000 
WFUS53 KDVN 182344
TORDVN
ILC071-187-190045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
641 PM CDT WED AUG 18 2004

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN HENDERSON COUNTY IN WEST CENTRAL ILLINOIS  
  WARREN COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 745 PM CDT

* AT 638 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LIKELY TO PRODUCE A TORNADO NEAR STRONGHURST...
  OR ABOUT 15 MILES SOUTHEAST OF OQUAWKA...MOVING EAST AT 15 MPH.
  DOPPLER RADAR INDICATED ANOTHER SEVERE THUNDERSTORM CONTAINING LARGE HAIL
  NEAR KINGSTON IN DES MOINES COUNTY. THIS STORM WILL MOVE EAST
  AT 25 MPH AND AFFECT LOCATIONS FROM NEAR OQUAWKA AND DELABAR STATE
  PARK...TO ROZETTA.

* THE TORNADO IS EXPECTED TO BE NEAR...
  STRONGHURST...NOW
  5 MILES SOUTH OF MEDIA BY 750 PM CDT
  ROSEVILLE BY 735 PM CDT

THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM
OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING.

THIS STORM HAS ALREADY PRODUCED A TORNADO AND REMAINS A THREAT.

LAT...LON 4083 9092 4072 9094 4070 9082 4068 9050
      4085 9048

$$

MCCLURE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 6:03 PM CDT	Severe Thunderstorm Warning	DVN	Warren	57 min
Aug 18, 6:05 PM CDT	Tornado Warning	DVN	Henderson	40 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.