Alert archive / Illinois / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 21, NWS Quad Cities, IA

April 30, 2003Henry County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 30, 2003, 9:02 PM CDT for Henry County, Illinois. It was in force for 58 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, 9:02 PM CDT (02:02 UTC)
Expired: Apr 30, 2003, 10:00 PM CDT
In force: 58 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), 38 km from the middle of the area, began a volume at 02:01 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, 2.0 hours before the alert went out and 34 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.

853 
WUUS53 KDVN 010202
SVRDVN
ILC073-010300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
901 PM CDT WED APR 30 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HENRY COUNTY IN NORTHWEST ILLINOIS

* UNTIL 1000 PM CDT

* AT 900 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS
  ALONG A LINE EXTENDING FROM 4 MILES SOUTHEAST OF EAST MOLINE TO 
  13 MILES SOUTHWEST OF CAMBRIDGE...MOVING EAST AT 50 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  CAMBRIDGE
  KEWANEE
  GENESEO

BRIEF, TORNADO LIKE WINDS ARE POSSIBLE ALONG THE LEADING EDGE OF
THESE STORMS. THESE WINDS ARE CAPABLE OF PRODUCING LOCALIZED,
ENHANCED DAMAGE IN ADDITION TO STRAIGHT LINE WINDS. TAKE COVER IN A
STURDY STRUCTURE AND GO INTO AN INTERIOR ROOM OR BASEMENT UNTIL THESE
STORMS PASS.

THESE SEVERE THUNDERSTORMS ARE CAPABLE OF PRODUCING HAIL UP TO THE
SIZE OF GOLFBALLS AND WINDS IN EXCESS OF 55 MPH. TAKE COVER IN A
STURDY STRUCTURE AND GO INTO AN INTERIOR ROOM OR BASEMENT UNTIL THESE
STORMS PASS.

LAT...LON 4152 9036 4143 9041 4117 9042 4117 8989
          4157 8989

$$

WOLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:20 PM CDT	Tornado Warning	DVN	Henry	55 min
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, 9:24 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

Severe Thunderstorm Warnings in Illinois, 2003 Every severe thunderstorm warning 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.