Alert archive / Iowa / Tornado Warnings in 2004
Tornado Warning 31, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at May 28, 2004, 9:57 PM CDT for Woodbury County, Iowa. It was in force for 18 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
- May 28, 2004, 9:57 PM CDT (02:57 UTC)
- Expired
- May 28, 2004, 10:15 PM CDT
- In force
- 18 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), 120 km from the middle of the area, began a volume at 02:58 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 28, 3:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 28, 9:50 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.0 hours before the alert went out and 120 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS53 KFSD 290257 TORFSD IAC193-290315- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 955 PM CDT FRI MAY 28 2004 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... EASTERN WOODBURY COUNTY IN NORTHWEST IOWA * UNTIL 1015 PM CDT * AT 955 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES NORTHWEST OF DANBURY...OR ABOUT 17 MILES WEST OF IDA GROVE...MOVING EAST AT 30 MPH. THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. TAKE COVER NOW. THIS TORNADO WARNING EXTENDS THE EARLIER TORNADO WARNING FOR EASTERN WOODBURY COUNTY. THIS TORNADO DOES NOT THREATEN THE SIOUX CITY AREA. LAT...LON 4237 9584 4223 9585 4222 9568 4235 9569 $$ WILLIAMS
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 7:47 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 43 min |
| May 28, 8:04 PM CDT | Tornado Warning | FSD | Sioux | 41 min |
| May 28, 8:26 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 49 min |
| May 28, 8:37 PM CDT | Tornado Warning | FSD | Woodbury | 23 min |
| May 28, 8:44 PM CDT | Tornado Warning | FSD | Sioux | 46 min |
| May 28, 8:59 PM CDT | Tornado Warning | FSD | Woodbury | 31 min |
| May 28, 9:27 PM CDT | Tornado Warning | FSD | Sioux | 33 min |
| May 28, 9:31 PM CDT | Tornado Warning | FSD | Woodbury | 29 min |
| May 28, 9:35 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 25 min |
| May 28, 9:48 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 27 min |
| May 28, 9:57 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 33 min |
| May 28, 10:15 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 15 min |
| May 28, 10:17 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 13 min |
| May 28, 10:30 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 45 min |
| May 28, 10:32 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 28 min |
| May 28, 10:58 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 62 min |
| May 28, 11:13 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 32 min |
| May 28, 11:45 PM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 30 min |
| May 29, 12:02 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 28 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.