Alert archive / Illinois / Tornado Warnings in 2004

Tornado Warning 1, NWS Quad Cities, IA

April 20, 2004Bureau County, Putnam County, Illinois

NWS Quad Cities, IA issued this tornado warning at Apr 20, 2004, 5:15 PM CDT for Bureau County, Putnam County, Illinois. It was in force for 45 min. 3 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, 5:15 PM CDT (22:15 UTC)
Expired
Apr 20, 2004, 6:00 PM CDT
In force
45 min
Issued by
NWS Quad Cities, IA
Area
Counties, with a storm outline in the text

Counties Bureau County, IL, Putnam County, IL

What was reported inside it

TimeReportWhereRemark
Apr 20, 5:21 PM CDTTORNADO8 W Henry, ILTORNADO ON THE GROUND.
Apr 20, 5:23 PM CDTTORNADO6 Wnw Henry, ILHENRY CITY ESDA REPORTED SIGHTING ONE FUNNEL AND ONE TORNADO AT THE SAME TIME.
Apr 20, 5:47 PM CDTTORNADOGranville, ILROOF BLOWN OFF BANK AND TREES DOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 94 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2004-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2004-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1073 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
192 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.

307 
WFUS53 KDVN 202215
TORDVN
ILC011-155-202300-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
514 PM CDT TUE APR 20 2004

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL BUREAU COUNTY IN NORTH CENTRAL ILLINOIS
  PUTNAM COUNTY IN NORTH CENTRAL ILLINOIS

* UNTIL 600 PM CDT

* AT 509 PM CDT...TRAINED SPOTTERS REPORTED A TORNADO NEAR CAMP 
GROVE...OR 11 MILES SOUTH OF TISKILWA...MOVING NORTHEAST AT 30 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  6 MILES SOUTHEAST OF TISKILWA BY 525 PM CDT
  HENNEPIN BY 535 PM CDT
  7 MILES NORTHWEST OF GRANVILLE AND 8 MILES SOUTHEAST OF PRINCETON
  BY 540 PM CDT
  DEPUE BY 545 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
TUESDAY EVENING FOR SOUTHEASTERN IOWA AND NORTHEAST MISSOURI.

LAT...LON 4116 8970 4104 8953 4124 8921 4148 8938

$$

ERVIN

Nearby

Tornado Warnings in Illinois, 2004Every tornado warning in 2004Tornadoes 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.