Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 28, NWS Sioux Falls, SD

May 28, 2004Woodbury County, Iowa

NWS Sioux Falls, SD issued this tornado warning at May 28, 2004, 8:59 PM CDT for Woodbury County, Iowa. It was in force for 31 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 28, 2004, 8:59 PM CDT (01:59 UTC)
Expired
May 28, 2004, 9:30 PM CDT
In force
31 min
Issued by
NWS Sioux Falls, SD
Area
Counties, with a storm outline in the text

County Woodbury County, IA

The radar

The Omaha radar (KOAX), 127 km from the middle of the area, began a volume at 01:58 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.

What was reported inside it

TimeReportWhereRemark
May 28, 8:59 PM CDTHAIL 1.75Sioux City, IA2 MILES NORTH NORTHEAST OF SIOUX CITY AIRPORT
May 28, 8:59 PM CDTHAIL 1.75Sioux City, IA2 MILES NORTH NORTHEAST OF SIOUX CITY AIRPORT
May 28, 8:59 PM CDTHAIL 1.75Sioux City, IA2 MILES NORTH NORTHEAST OF SIOUX CITY AIRPORT

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 28, 3:45 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.0 hours before the alert went out and 127 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, Omaha, NE at 00:00Z on 2004-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 821 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, Omaha, NE at 00:00Z on 2004-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 152 square meters per square second.193958Sfc1 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
821 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
1968 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
152 m²/s²
0-3 km storm-relative helicity
379 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.5

Open this sounding in Storm Lab

The text

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

989 
WFUS53 KFSD 290159
TORFSD
IAC193-290230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
857 PM CDT FRI MAY 28 2004

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  WOODBURY COUNTY IN NORTHWEST IOWA

* UNTIL 930 PM CDT

* AT 857 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  TORNADO PRODUCING THUNDERSTORM  TORNADO WAS REPORTED 9 MILES WEST  
  3 MILES SOUTHEAST OF SIOUX CITY...MOVING EAST AT 25 MPH. REPORTES  
  OF FUNNEL CLOUDS AND 2 INCH DIAMETER HAIL HAVE BEEN RECEIVED FROM  
  THE SIOUX CITY AREA. 

* THE TORNADO WILL BE NEAR...
  SERGEANT BLUFF AROUND 905 PM CDT.
  BRONSON AROUND 915 PM CDT

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
FRIDAY EVENING FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND
NORTHEAST NEBRASKA AND SOUTHEASTERN SOUTH DAKOTA.

LAT...LON 4253 9641 4240 9638 4236 9610 4250 9608

$$WILLIAMS

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 28, 7:47 PM CDTSevere Thunderstorm WarningFSDLyon43 min
May 28, 8:04 PM CDTTornado WarningFSDSioux41 min
May 28, 8:26 PM CDTSevere Thunderstorm WarningFSDPlymouth, Woodbury49 min
May 28, 8:37 PM CDTTornado WarningFSDWoodbury23 min
May 28, 8:44 PM CDTTornado WarningFSDSioux46 min
May 28, 9:27 PM CDTTornado WarningFSDSioux33 min
May 28, 9:31 PM CDTTornado WarningFSDWoodbury29 min
May 28, 9:35 PM CDTSevere Thunderstorm WarningFSDPlymouth25 min
May 28, 9:48 PM CDTSevere Thunderstorm WarningFSDIda27 min
May 28, 9:57 PM CDTSevere Thunderstorm WarningFSDPlymouth, Sioux33 min
May 28, 9:57 PM CDTTornado WarningFSDWoodbury18 min
May 28, 10:15 PM CDTSevere Thunderstorm WarningFSDIda15 min
May 28, 10:17 PM CDTSevere Thunderstorm WarningFSDIda13 min
May 28, 10:30 PM CDTSevere Thunderstorm WarningFSDCherokee45 min
May 28, 10:32 PM CDTSevere Thunderstorm WarningFSDPlymouth28 min
May 28, 10:58 PM CDTSevere Thunderstorm WarningFSDIda62 min
May 28, 11:13 PM CDTSevere Thunderstorm WarningFSDCherokee32 min
May 28, 11:45 PM CDTSevere Thunderstorm WarningFSDDickinson30 min
May 29, 12:02 AM CDTSevere Thunderstorm WarningFSDBuena Vista28 min

Nearby

Tornado Warnings in Iowa, 2004Every tornado warning in 2004Tornadoes in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.