Alert archive / Nebraska / Tornado Warnings in 1997

Tornado Warning 4, NWS North Platte, NE

June 20, 1997Sheridan County, Nebraska

NWS North Platte, NE issued this tornado warning at Jun 20, 1997, 4:52 PM MDT for Sheridan County, Nebraska. It was in force for 33 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: Jun 20, 1997, 4:52 PM MDT (22:52 UTC)
Expired: Jun 20, 1997, 5:25 PM MDT
In force: 33 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Sheridan County, NE

The radar

The North Platte radar (KLNX), 163 km from the middle of the area, began a volume at 22:56 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
Jun 20, 2:30 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.9 hours before the alert went out and 178 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1334 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

887 
WFUS1 KLBF 202252 RRA
TORLBF
NEC161-202325-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
552 PM CDT (452 PM MDT) FRI JUN 20 1997

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE NE HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 525 PM MDT (625 PM CDT)
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN THE NEBRASKA PANHANDLE

   ...SOUTHERN SHERIDAN COUNTY
 
AT 449 PM MDT...A POSSIBLE TORNADO WAS INDICATED BY NORTH PLATTE
DOPPLER RADAR 21 MILES EAST OF ALLIANCE OR 11 MILES NORTHWEST OF
ELLSWORTH MOVING EAST SOUTHEAST AT 35 MPH.

THE TORNADO IS EXPECTED TO BE NEAR...
  ELLSWORTH                    BY 500 PM MDT

THIS REPLACES THE SEVERE THUNDERSTORM WARNING ISSUED EARLIER.
 
IF YOU ARE IN THE PATH OF THIS TORNADO TAKE SHELTER IMMEDIATELY.
THE SAFEST PLACE IN A HOME OR BUSINESS IS AN INTERIOR ROOM ON THE
LOWEST FLOOR POSSIBLE. AVOID WINDOWS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 6:13 PM MDT	Severe Thunderstorm Warning	LBF	Brown, Rock	62 min
Jun 19, 6:20 PM MDT	Severe Thunderstorm Warning	LBF	Perkins	60 min
Jun 19, 7:15 PM MDT	Severe Thunderstorm Warning	LBF	Holt	65 min
Jun 19, 9:49 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	31 min
Jun 19, 10:23 PM MDT	Severe Thunderstorm Warning	LBF	Frontier, Lincoln	47 min
Jun 20, 4:13 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	62 min
Jun 20, 5:25 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	60 min

Nearby

Tornado Warnings in Nebraska, 1997 Every tornado warning in 1997 Tornadoes in 1997

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.