Alert archive / Iowa / Tornado Warnings in 2000
Tornado Warning 10, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Jul 9, 2000, 9:11 PM CDT for Lyon County, Sioux County, Iowa. It was in force for 34 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 9, 2000, 9:11 PM CDT (02:11 UTC)
- Expired
- Jul 9, 2000, 9:45 PM CDT
- In force
- 34 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lyon County, IA, Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 59 km from the middle of the area, began a volume at 02:12 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 9, 9:15 PM CDT | Tornado F1 | Doon, IA | A tornado destroyed a machine shed and a garage. The tornado also uprooted several trees and flattened part of a corn crop. The tornado formed 5 miles east of Doon, then moved south, crossing the county line into Sioux County, where further damage occurred. |
| Jul 9, 9:17 PM CDT | Tornado F0 | Hull, IA | A tornado crossed into Sioux County from Lyon County to the north, where it had caused damage. In Sioux County, the tornado blew down power lines and caused tree damage. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 2.2 hours before the alert went out and 213 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
- 2654 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 1802 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 17.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS53 KFSD 100212 TORFSD IAC119-167-100245- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 911 PM CDT SUN JUL 9 2000 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... SOUTHEAST LYON COUNTY IN NORTHWEST IOWA NORTHEAST SIOUX COUNTY IN NORTHWEST IOWA * UNTIL 945 PM CDT * AT 911 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO 6 MILES NORTHWEST OF BOYDEN...OR ABOUT 13 MILES SOUTH OF ROCK RAPIDS...MOVING EAST AT 30 MPH. * THE TORNADO WILL BE NEAR... MATLOCK AROUND 925 PM CDT THIS IS AN EXTREMELY DANGEROUS AND POTENTIALLY LIFE THREATENING SITUATION. IF YOU ARE IN THE PATH OF THISF TORNADO...TAKE COVER IMMEDIATELY. GO TO THE BASEMENT. IF A BASEMENT IS NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR.
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 9:39 PM CDT | Tornado Warning | FSD | O'Brien, Osceola | 36 min |
| Jul 9, 10:14 PM CDT | Tornado Warning | FSD | O'Brien, Osceola | 31 min |
| Jul 9, 10:18 PM CDT | Flash Flood Warning | FSD | Dickinson | 87 min |
| Jul 9, 10:24 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 36 min |
| Jul 9, 10:39 PM CDT | Flash Flood Warning | FSD | Clay, O'Brien | 96 min |
Nearby
Tornado Warnings in Iowa, 2000Every tornado warning in 2000Tornadoes in 2000
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.