Alert archive / Nebraska / Tornado Warnings in 1998

Tornado Warning 13, NWS North Platte, NE

May 21, 1998Chase County, Perkins County, Nebraska

NWS North Platte, NE issued this tornado warning at May 21, 1998, 6:48 PM MDT for Chase County, Perkins County, Nebraska. It was in force for 62 min. 2 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 21, 1998, 6:48 PM MDT (00:48 UTC)
Expired: May 21, 1998, 7:50 PM MDT
In force: 62 min
Issued by: NWS North Platte, NE
Area: Whole counties

Counties Chase County, NE, Perkins County, NE

The radar

The Goodland radar (KGLD), 147 km from the middle of the area, began a volume at 00:52 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
May 21, 7:00 PM MDT	Hail 1.75	Lamar, NE	Large hail damaged up to 3000 acres of wheat.
May 21, 7:00 PM MDT	Hail 1	Grant, NE

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
May 21, 2:15 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.8 hours before the alert went out and 103 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: 685 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 220045 RRA
TORLBF
NEC029-135-220150-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
748 PM CDT (648 PM MDT) THU MAY 21 1998

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN CHASE COUNTY IN SOUTHWESTERN NEBRASKA
  SOUTHERN PERKINS COUNTY IN SOUTHWESTERN NEBRASKA

* UNTIL 750 PM MDT (850 PM CDT)

* AT 647 PM MDT... SPOTTERS INDICATED A TORNADO 14 MILES
  NORTHWEST OF IMPERIAL OR 9 MILES SOUTH SOUTHEAST OF   BRANDON
  MOVING EAST AT 25 MPH.

* THE TORNADO IS EXPECTED TO REMAIN IN RURAL AREAS.

THIS REPLACES THE SEVERE THUNDERSTORM WARNING WHICH WAS IN EFFECT.

THIS IS A DANGEROUS SITUATION! ACT QUICKLY! IT MAY SAVE YOUR LIFE!
MOVE TO A BASEMENT IF POSSIBLE. OTHERWISE...GO TO A SMALL INTERIOR
ROOM ON THE LOWEST FLOOR.  STAY AWAY FROM WINDOWS AND DOORS.

MTM

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 21, 6:01 PM MDT	Tornado Warning	LBF	Frontier	34 min
May 21, 6:13 PM MDT	Tornado Warning	LBF	Perkins	32 min
May 21, 6:19 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	66 min
May 21, 6:38 PM MDT	Tornado Warning	LBF	Frontier	32 min
May 21, 6:44 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	66 min
May 21, 7:29 PM MDT	Tornado Warning	LBF	Hayes	66 min
May 21, 7:59 PM MDT	Tornado Warning	LBF	Hayes	66 min
May 21, 8:08 PM MDT	Severe Thunderstorm Warning	LBF	Perkins	47 min
May 21, 8:26 PM MDT	Tornado Warning	LBF	Frontier	64 min
May 21, 8:59 PM MDT	Tornado Warning	LBF	Frontier	66 min
May 21, 10:13 PM MDT	Severe Thunderstorm Warning	LBF	Chase	62 min
May 21, 10:46 PM MDT	Severe Thunderstorm Warning	LBF	Chase	44 min

Nearby

Tornado Warnings in Nebraska, 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.