Alert archive / Nebraska / Tornado Warnings in 1998

Tornado Warning 13, NWS Sioux Falls, SD

May 28, 1998Union County, South Dakota; Dakota County, Dixon County, Nebraska

NWS Sioux Falls, SD issued this tornado warning at May 28, 1998, 6:57 PM CDT for Union County, South Dakota; Dakota County, Dixon County, Nebraska. It was in force for 33 min. 6 reports 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: May 28, 1998, 6:57 PM CDT (23:57 UTC)
Expired: May 28, 1998, 7:30 PM CDT
In force: 33 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Dakota County, NE, Dixon County, NE, Union County, SD

The radar

The Sioux Falls radar (KFSD), 113 km from the middle of the area, began a volume at 23:59 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
May 28, 6:58 PM CDT	Tornado F0	Martinsburg, NE
May 28, 7:00 PM CDT	Hail 1.75	Ponca, NE
May 28, 7:10 PM CDT	Hail 1.5	Newcastle, NE
May 28, 7:10 PM CDT	Tornado F0	Newcastle, NE
May 28, 7:15 PM CDT	Hail 1.75	Jefferson, SD
May 28, 7:20 PM CDT	Hail 1.75	North Sioux City, SD

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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 12.0 hours before the alert went out and 142 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: 1669 J/kg
Mixed-layer CIN: -237 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 282357 RRA
TORFSD
NEC043-051-SDC127-290030-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
657 PM CDT THU MAY 28 1998

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN UNION COUNTY IN SOUTHEASTERN SOUTH DAKOTA
  NORTHERN DAKOTA COUNTY IN NORTHEASTERN NEBRASKA
  NORTHERN DIXON COUNTY IN NORTHEASTERN NEBRASKA

* UNTIL 730 PM CDT

* AT 655 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A DEVELOPING TORNADO 24 MILES WEST OF SIOUX CITY  OR 7 MILES WEST
  OF PONCA MOVING EAST AT 30 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  PONCA                    AROUND 700 PM CDT
  WILLIS                   AROUND 8705 PM CDT
  JEFFERSON                AROUND 715 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.

TRM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 5:28 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	32 min
May 28, 6:49 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	16 min

Nearby

Tornado Warnings in Nebraska, 1998 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.