Alert archive / South Dakota / Tornado Warnings in 1998
Tornado Warning 21, NWS Aberdeen, SD
NWS Aberdeen, SD issued this tornado warning at Jul 14, 1998, 9:39 PM CDT for Deuel County, South Dakota. It was in force for 66 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 14, 1998, 9:39 PM CDT (02:39 UTC)
- Expired
- Jul 14, 1998, 10:45 PM CDT
- In force
- 66 min
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Deuel County, SD
The radar
The Sioux Falls radar (KFSD), 130 km from the middle of the area, began a volume at 02:39 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 14, 9:40 PM CDT | Thunderstorm Wind 61 | Clear Lake, SD | Winds gusting to 70 mph brought several trees down in Clear Lake. |
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 14, 4:30 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 2.7 hours before the alert went out and 137 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
- 4358 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1271 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -1.0
The text
As transmitted, in the capitals the NWS used until 2016.
911 WFUS1 KABR 150240 RRA TORABR SDC039-150345- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ABERDEEN SD 939 PM CDT TUE JUL 14 1998 THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A * TORNADO WARNING FOR... DEUEL COUNTY IN NORTHEASTERN SOUTH DAKOTA * UNTIL 1045 PM CDT * AT 938 PM CDT... ABERDEEN DOPPLER RADAR INDICATED A TORNADO 20 MILES SOUTHEAST OF WATERTOWN OR 3 MILES WEST OF CLEAR LAKE MOVING SOUTHEAST AT 15 MPH. * THE TORNADO WILL BE NEAR... CLEAR LAKE AT 935 PM CDT BRANDT AT 955 PM CDT ASTORIA AT 1025 PM CDT GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR TDK
The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 7:59 PM CDT | Severe Thunderstorm Warning | ABR | Codington | 61 min |
| Jul 14, 8:23 PM CDT | Severe Thunderstorm Warning | ABR | Grant | 62 min |
| Jul 14, 8:54 PM CDT | Severe Thunderstorm Warning | ABR | Hamlin | 61 min |
| Jul 14, 8:58 PM CDT | Severe Thunderstorm Warning | ABR | Codington, Deuel | 62 min |
Nearby
Tornado Warnings in South Dakota, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.