Alert archive / South Dakota / Tornado Warnings in 1998

Tornado Warning 25, NWS Sioux Falls, SD

May 30, 1998Turner County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at May 30, 1998, 9:28 PM CDT for Turner County, South Dakota. It was in force for 32 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: May 30, 1998, 9:28 PM CDT (02:28 UTC)
Expired: May 30, 1998, 10:00 PM CDT
In force: 32 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Turner County, SD

The radar

The Sioux Falls radar (KFSD), 46 km from the middle of the area, began a volume at 02:29 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 30, 8:30 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.5 hours before the alert went out and 203 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1585 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1033 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFSD 310228 RRA
TORFSD
SDC125-310300-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
928 PM CDT SAT MAY 30 1998

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN TURNER COUNTY IN SOUTHEASTERN SOUTH DAKOTA

* UNTIL 1000 PM CDT

* AT 927 PM CDT... NATIONAL WEATHER SERVICE SPOTTERS REPORTED A
  TORNADO 21 MILES WEST OF SIOUX FALLS  OR 3 MILES NORTH OF PARKER
  MOVING EAST AT 35 MPH.

* THE TORNADO IS CURRENTLY EXPECTED TO REMAIN OVER RURAL AREAS.



IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR
LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&
CHAPMAN

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this tornado warning went out at May 30, 9:10 PM CDT, 18 minutes earlier.

Area forecast discussion, May 30, 9:10 PM CDT, 18 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
910 PM CDT SAT MAY 30 1998

LN OF SVR TSTMS NOW TURNING SEWD INTO SE SD WITH TORNADOES RPTD W OF
FSD. WL HAVE TO UPDATE AGAIN AFT LN PASSES BUT IN THE MEANTIME PRETTY
NASTY. PREV FCST IN THE BALLPARK.

.FSD...NONE
RYRHOLM

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 7:23 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	32 min
May 30, 7:40 PM CDT	Severe Thunderstorm Warning	FSD	Sanborn	30 min
May 30, 7:44 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson	31 min
May 30, 8:12 PM CDT	Tornado Warning	FSD	Hanson	33 min
May 30, 8:24 PM CDT	Severe Thunderstorm Warning	FSD	Miner	31 min
May 30, 8:32 PM CDT	Tornado Warning	FSD	McCook	33 min
May 30, 8:45 PM CDT	Tornado Warning	FSD	Hanson	35 min
May 30, 9:04 PM CDT	Tornado Warning	FSD	McCook	36 min
May 30, 9:09 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Moody	31 min
May 30, 9:20 PM CDT	Tornado Warning	FSD	Minnehaha	50 min
May 30, 9:48 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	32 min
May 30, 9:56 PM CDT	Tornado Warning	FSD	Lincoln	24 min
May 30, 10:08 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	32 min

Nearby

Tornado Warnings in South Dakota, 1998 Every tornado warning in 1998 Tornadoes 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.