Alert archive / Iowa / Tornado Warnings in 2003

Tornado Warning 6, NWS Des Moines, IA

April 30, 2003Appanoose County, Iowa

NWS Des Moines, IA issued this tornado warning at Apr 30, 2003, 8:35 PM CDT for Appanoose County, Iowa. It was in force for 40 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, 8:35 PM CDT (01:35 UTC)
Expired: Apr 30, 2003, 9:15 PM CDT
In force: 40 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Appanoose County, IA

The radar

The Des Moines radar (KDMX), 130 km from the middle of the area, began a volume at 01:37 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, 1.6 hours before the alert went out and 225 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.

879 
WFUS53 KDMX 010135
TORDMX
IAC007-010215-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
834 PM CDT WED APR 30 2003

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  APPANOOSE COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 915 PM CDT

* AT 832 PM...RADAR INDICATED A THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO OVER CINCINNATI...OR ABOUT 36 MILES SOUTHWEST OF OTTUMWA...
  MOVING EAST AT 35 MPH.

* THE STORM WILL BE...

  NEAR MOULTON AROUND 850 PM.

AT 830 PM...THE PUBLIC REPORTED A POSSIBLE TORNADO A FEW MILES SOUTH 
OF NUMA.  AT 832 PM...THE SHERIFF REPORTED GOLBALL SIZE HAIL AND 
HIGH WIND IN NUMA.

THIS WARNING REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY
ISSUED FOR THE WARNED AREA.

THIS IS A HAZARDOUS SITUATION. SEEK SHELTER IN A BASEMENT...OR IN AN
INTERIOR ROOM. STAY AWAY FROM WINDOWS. IF YOU ARE OUTSIDE OR IN A
CAR...SEEK SHELTER IN A REINFORCED BUILDING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM WEDNESDAY EVENING FOR
SOUTHERN IOWA.

LAT...LON 4082 9308 4059 9310 4060 9266 4084 9266

KINNEY

$$

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 7:24 PM CDT	Severe Thunderstorm Warning	DMX	Wapello	66 min
Apr 30, 7:34 PM CDT	Severe Thunderstorm Warning	DMX	Wayne	41 min
Apr 30, 7:41 PM CDT	Tornado Warning	DMX	Wapello	49 min
Apr 30, 7:54 PM CDT	Tornado Warning	DMX	Wayne	51 min
Apr 30, 8:01 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	44 min
Apr 30, 8:09 PM CDT	Severe Thunderstorm Warning	DMX	Wayne	51 min
Apr 30, 8:10 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska	50 min
Apr 30, 8:12 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose	48 min
Apr 30, 8:25 PM CDT	Severe Thunderstorm Warning	DMX	Madison	20 min
Apr 30, 8:36 PM CDT	Severe Thunderstorm Warning	DMX	Warren	54 min
Apr 30, 8:38 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	67 min
Apr 30, 8:47 PM CDT	Severe Thunderstorm Warning	DMX	Polk	43 min
Apr 30, 9:09 PM CDT	Severe Thunderstorm Warning	DMX	Davis	66 min
Apr 30, 9:33 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek	42 min
Apr 30, 9:57 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall	48 min

Nearby

Tornado Warnings in Iowa, 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.