Alert archive / Iowa / Tornado Warnings in 2000
Tornado Warning 25, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Jul 11, 2000, 8:36 PM CDT for Osceola County, Iowa. It was in force for 24 min. 1 report 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 11, 2000, 8:36 PM CDT (01:36 UTC)
- Expired
- Jul 11, 2000, 9:00 PM CDT
- In force
- 24 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Osceola County, IA
The radar
The Sioux Falls radar (KFSD), 92 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 11, 8:36 PM CDT | Tornado F0 | Sibley, IA | A brief tornado caused no reported 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 11, 4:30 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 11, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 1.6 hours before the alert went out and 230 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
- 942 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 884 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS53 KFSD 120136 TORFSD IAC143-120200- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 836 PM CDT TUE JUL 11 2000 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... NORTHERN OSCEOLA COUNTY IN NORTHWEST IOWA * UNTIL 900 PM CDT * AT 836 PM CDT...WEATHER SPOTTERS REPORTED A TORNADO 5 MILES NORTH OF SIBLEY...OR ABOUT 12 MILES SOUTHWEST OF WORTHINGTON...MOVING EAST AT 20 MPH. * THE TORNADO WILL BE NEAR... HARRIS AROUND 900 PM CDT DAMAGING WINDS ARE ALSO POSSIBLE WITH THESE STORMS. THIS IS AN EXTREMELY DANGEROUS AND POTENTIALLY LIFE THREATENING SITUATION. IF YOU ARE IN THE PATH OF THIS TORNADO...TA+KE 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 11, 7:52 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 23 min |
| Jul 11, 8:52 PM CDT | Tornado Warning | FSD | Plymouth | 23 min |
| Jul 11, 9:40 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 35 min |
| Jul 11, 10:04 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 26 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.