Alert archive / Iowa / Tornado Warnings in 2003

Tornado Warning 8, NWS Quad Cities, IA

April 30, 2003Washington County, Iowa

NWS Quad Cities, IA issued this tornado warning at Apr 30, 2003, 7:11 PM CDT for Washington County, Iowa. It was in force for 34 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, 7:11 PM CDT (00:11 UTC)
Expired
Apr 30, 2003, 7:45 PM CDT
In force
34 min
Issued by
NWS Quad Cities, IA
Area
Counties, with a storm outline in the text

County Washington County, IA

The radar

The Quad Cities radar (KDVN), 104 km from the middle of the area, began a volume at 00:13 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.

IssuedProductOfficeLasted
Apr 30, 5:15 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.2 hours before the alert went out and 111 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 00:00Z on 2003-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1022 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2003-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 457 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
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.

254 
WFUS53 KDVN 010011
TORDVN
IAC183-010045-

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

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  WASHINGTON COUNTY IN SOUTHEAST IOWA

* UNTIL 745 PM CDT

* AT 708 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH A POSSIBLE TORNADO 3 MILES SOUTHWEST OF
  WEST CHESTER...OR 8 MILES WEST OF WASHINGTON...MOVING NORTHEAST AT
  35 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
   WEST CHESTER BY 715 PM CDT.
  5 MILES NORTHWEST OF WASHINGTON BY 720 PM CDT.
  4 MILES SOUTHEAST OF RICHMOND BY 730 PM CDT.
   RIVERSIDE BY 735 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.

LAT...LON 4138 9194 4117 9191 4122 9153 4151 9153

$$

MCCLURE

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 7:06 PM CDTSevere Thunderstorm WarningDVNJefferson39 min
Apr 30, 7:28 PM CDTSevere Thunderstorm WarningDVNJefferson17 min
Apr 30, 7:43 PM CDTSevere Thunderstorm WarningDVNJohnson32 min
Apr 30, 7:46 PM CDTSevere Thunderstorm WarningDVNJefferson29 min
Apr 30, 7:50 PM CDTSevere Thunderstorm WarningDVNLouisa40 min
Apr 30, 7:53 PM CDTSevere Thunderstorm WarningDVNHenry37 min
Apr 30, 7:58 PM CDTSevere Thunderstorm WarningDVNMuscatine47 min
Apr 30, 8:00 PM CDTFlash Flood WarningDVNLouisa5 hr
Apr 30, 8:14 PM CDTSevere Thunderstorm WarningDVNBenton, Buchanan, Linn46 min
Apr 30, 8:32 PM CDTSevere Thunderstorm WarningDVNDelaware28 min
Apr 30, 9:27 PM CDTSevere Thunderstorm WarningDVNDes Moines48 min
Apr 30, 9:33 PM CDTSevere Thunderstorm WarningDVNBuchanan27 min
Apr 30, 9:38 PM CDTSevere Thunderstorm WarningDVNJones, Linn22 min
Apr 30, 10:05 PM CDTSevere Thunderstorm WarningDVNBenton, Iowa25 min
Apr 30, 10:42 PM CDTSevere Thunderstorm WarningDVNLee48 min

Nearby

Tornado Warnings in Iowa, 2003Every tornado warning in 2003Tornadoes 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.