Alert archive / Iowa / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 13, NWS Quad Cities, IA

April 30, 2003Jefferson County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 30, 2003, 7:46 PM CDT for Jefferson County, Iowa. It was in force for 29 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, 7:46 PM CDT (00:46 UTC)
Expired: Apr 30, 2003, 8:15 PM CDT
In force: 29 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Jefferson County, IA

The radar

The Quad Cities radar (KDVN), 128 km from the middle of the area, began a volume at 00:49 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, 5:15 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.8 hours before the alert went out and 134 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.

255 
WUUS53 KDVN 010046
SVRDVN
IAC101-010115-

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

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN SOUTHEAST IOWA

* UNTIL 815 PM CDT

* AT 740 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL OVER FAIRFIELD...MOVING
  NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
   SALINA BY 745 PM CDT.
   EAST PLEASANT PLAIN BY 750 PM CDT.
   GERMANVILLE BY 755 PM CDT.

AT 740 PM CDT...NATIONAL WEATHER SERVICE EMPLOYEES REPORTED NICKEL 
SIZE HAIL COVERING THE GROUND IN FAIRFIELD. 

THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO THE SIZE
OF GOLFBALLS OR 1.75 INCHES IN DIAMETER. TAKE COVER IN A STURDY
STRUCTURE AND GO INTO AN INTERIOR ROOM OR BASEMENT UNTIL THE STORM
PASSES.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.
TAKE COVER IN A STURDY STRUCTURE AND GO INTO AN INTERIOR ROOM OR
BASEMENT UNTIL THE STORM PASSES.

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT WEDNESDAY EVENING
FOR SOUTHEASTERN IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST
MISSOURI.

LAT...LON 4106 9207 4092 9192 4101 9173 4116 9177

$$

MCCLURE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:06 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson	39 min
Apr 30, 7:11 PM CDT	Tornado Warning	DVN	Washington	34 min
Apr 30, 7:28 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson	17 min
Apr 30, 7:43 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	32 min
Apr 30, 7:50 PM CDT	Severe Thunderstorm Warning	DVN	Louisa	40 min
Apr 30, 7:53 PM CDT	Severe Thunderstorm Warning	DVN	Henry	37 min
Apr 30, 7:58 PM CDT	Severe Thunderstorm Warning	DVN	Muscatine	47 min
Apr 30, 8:00 PM CDT	Flash Flood Warning	DVN	Louisa	5 hr
Apr 30, 8:14 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Linn	46 min
Apr 30, 8:32 PM CDT	Severe Thunderstorm Warning	DVN	Delaware	28 min
Apr 30, 9:27 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines	48 min
Apr 30, 9:33 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	27 min
Apr 30, 9:38 PM CDT	Severe Thunderstorm Warning	DVN	Jones, Linn	22 min
Apr 30, 10:05 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa	25 min
Apr 30, 10:42 PM CDT	Severe Thunderstorm Warning	DVN	Lee	48 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.