Alert archive / Illinois / Tornado Warnings in 2003

Tornado Warning 9, NWS Quad Cities, IA

April 30, 2003Henry County, Illinois

NWS Quad Cities, IA issued this tornado warning at Apr 30, 2003, 7:20 PM CDT for Henry County, Illinois. It was in force for 55 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: Apr 30, 2003, 7:20 PM CDT (00:20 UTC)
Expired: Apr 30, 2003, 8:15 PM CDT
In force: 55 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Henry County, IL

The radar

The Quad Cities radar (KDVN), 47 km from the middle of the area, began a volume at 00:24 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
Apr 30, 5:50 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.3 hours before the alert went out and 44 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: 1022 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 839 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 457 m²/s²
0-3 km storm-relative helicity: 611 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 12.6

Open this sounding in Storm Lab

The text

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

994 
WFUS53 KDVN 010020
TORDVN
ILC073-010115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
719 PM CDT WED APR 30 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN HENRY COUNTY IN NORTHWEST ILLINOIS

* UNTIL 815 PM CDT

* AT 713 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM WITH A TORNADO 5 MILES WEST OF OPHIEM...OR 14 
MILES EAST OF ALEDO...MOVING EAST AT 30 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
   OPHIEM BY 720 PM CDT.
   LYNN CENTER BY 725 PM CDT.
   ANDOVER BY 730 PM CDT.
   CAMBRIDGE BY 740 PM CDT.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
WEDNESDAY EVENING FOR NORTHWESTERN ILLINOIS.

LAT...LON 4136 9043 4117 9042 4117 8989 4140 8987

$$

WOLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 8:00 PM CDT	Flash Flood Warning	DVN	Mercer	5 hr
Apr 30, 8:22 PM CDT	Tornado Warning	DVN	Henry	38 min
Apr 30, 8:25 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island	50 min
Apr 30, 8:36 PM CDT	Severe Thunderstorm Warning	DVN	Mercer	39 min
Apr 30, 8:44 PM CDT	Tornado Warning	DVN	Bureau	61 min
Apr 30, 8:55 PM CDT	Tornado Warning	DVN	Bureau	50 min
Apr 30, 9:02 PM CDT	Severe Thunderstorm Warning	DVN	Henry	58 min
Apr 30, 9:24 PM CDT	Flash Flood Warning	DVN	Henry	5 hr
Apr 30, 9:37 PM CDT	Tornado Warning	DVN	Putnam	38 min
Apr 30, 9:42 PM CDT	Severe Thunderstorm Warning	DVN	Henderson	48 min
Apr 30, 9:48 PM CDT	Tornado Warning	DVN	Bureau	57 min
Apr 30, 10:02 PM CDT	Severe Thunderstorm Warning	DVN	Warren	43 min
Apr 30, 10:15 PM CDT	Tornado Warning	DVN	Putnam	45 min

Nearby

Tornado Warnings in Illinois, 2003 Every tornado warning in 2003 Tornadoes in 2003

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.