Alert archive / Iowa / Tornado Warnings in 1998
Tornado Warning 37, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Jun 23, 1998, 8:39 PM CDT for Sioux County, Iowa. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 23, 1998, 8:39 PM CDT (01:39 UTC)
- Expired
- Jun 23, 1998, 9:10 PM CDT
- In force
- 31 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 72 km from the middle of the area, began a volume at 01:41 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 |
|---|---|---|---|
| Jun 23, 7:30 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 1.7 hours before the alert went out and 285 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
- 901 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1105 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 335 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 8.6
The text
As transmitted, in the capitals the NWS used until 2016.
167 WFUS1 KFSD 240141 RRA TORFSD IAC167-240210- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 839 PM CDT TUE JUN 23 1998 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... SOUTHERN SIOUX COUNTY IN NORTHWESTERN IOWA * UNTIL 910 PM CDT * AT 837 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A DEVELOPING TORNADO 25 MILES NORTH OF SIOUX CITY OR 6 MILES SOUTHWEST OF MC NALLY MOVING NORTHEAST AT 25 MPH. * THE TORNADO IS EXPECTED TO BE NEAR... MC NALLY AROUND 845 PM CDT IRETON AROUND 900 PM CDT IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IN A HOME OR BUSINESS IS AN INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE. AVOID WINDOWS. THIS IS THE SAME STORM THAT PRODUCED A TORNADO NEAR WESTFIELD AT 833 PM. MG &
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 7:19 PM CDT | Tornado Warning | FSD | Woodbury | 31 min |
| Jun 23, 7:50 PM CDT | Tornado Warning | FSD | Woodbury | 35 min |
| Jun 23, 8:16 PM CDT | Tornado Warning | FSD | Woodbury | 34 min |
| Jun 23, 8:18 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 32 min |
| Jun 23, 8:23 PM CDT | Tornado Warning | FSD | Plymouth | 32 min |
| Jun 23, 8:51 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 34 min |
| Jun 23, 9:20 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 50 min |
| Jun 23, 9:55 PM CDT | Flash Flood Warning | FSD | Woodbury | 3 hr |
| Jun 24, 1:35 AM CDT | Flash Flood Warning | FSD | Woodbury | 5 hr |
Nearby
Tornado Warnings in Iowa, 1998Every tornado warning in 1998Tornadoes in 1998
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.