Alert archive / South Dakota / Tornado Warnings in 1998

Tornado Warning 24, NWS Sioux Falls, SD

May 30, 1998Minnehaha County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at May 30, 1998, 9:20 PM CDT for Minnehaha County, South Dakota. It was in force for 50 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, 9:20 PM CDT (02:20 UTC)
Expired: May 30, 1998, 10:10 PM CDT
In force: 50 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 11 km from the middle of the area, began a volume at 02:24 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, 2.3 hours before the alert went out and 187 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 310220 RRA
TORFSD
SDC099-310310-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  MINNEHAHA COUNTY IN SOUTHEASTERN SOUTH DAKOTA

* UNTIL 1010 PM CDT

* AT 918 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A DEVELOPING TORNADO 15 MILES WEST OF SIOUX FALLS  OR 5 MILES
  SOUTHWEST OF HARTFORD MOVING EAST AT 35 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  ELLIS                    AROUND 925 PM CDT
  SIOUX FALLS              AROUND 935 PM CDT
  BRANDON                  AROUND 945 PM CDT
  CORSON                   AROUND 945 PM CDT
  ROWENA                   AROUND 950 PM CDT

NATIONAL WEATHER SERVICE SPOTTER INICATED A TORNADO NEAR WALL LAKE.
TAKE COVER IMMEDIATELY.

DO NOT USE YOUR CAR TO OUTRUN A TORNADO.  CARS ARE EASILY TOSSED
AROUND BY TORNADIC WINDS.  IF YOU ARE CAUGHT IN THE PATH OF A
TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING.  IF NO
STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT.

&
CHAPMAN

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, 9:28 PM CDT	Tornado Warning	FSD	Turner	32 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.