Alert archive / Nebraska / Tornado Warnings in 1997

Tornado Warning 17, NWS Cheyenne, WY

June 20, 1997Box Butte County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 20, 1997, 3:39 PM MDT for Box Butte County, Nebraska. It was in force for 31 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, 3:39 PM MDT (21:39 UTC)
Expired: Jun 20, 1997, 4:10 PM MDT
In force: 31 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Box Butte County, NE

The radar

The Cheyenne radar (KCYS), 186 km from the middle of the area, began a volume at 21:42 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, 9.7 hours before the alert went out and 206 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.

402 
WFUS1 KCYS 202140 RRA
TORCYS
NEC013-202210-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
339 PM MDT FRI JUN 20 1997

* TORNADO WARNING FOR
  NORTHERN BOX BUTTE COUNTY IN NORTHWESTERN NEBRASKA PANHANDLE

* UNTIL 410 PM MDT

* SOME LOCATIONS AFFECTED
  INTERSECTION OF HWYS 87 AND 385      BY 347 PM MDT

* AT 338 PM MDT...A DEVELOPING TORNADO WAS INDICATED BY DOPPLER RADAR
  AND SPOTTER REPORTS 24 MILES NORTHWEST OF ALLIANCE OR 10 MILES
  NORTHWEST OF INTERSECTION OF HWYS 87 AND 385 MOVING EAST AT 35 MPH.
 
 
STAY AWAY FROM WINDOWS...DOORS...AND OUTSIDE WALLS.  IN YOUR BASEMENT
AVOID CHIMNEYS AND BRICK WALLS.

LRE

&

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 2:32 PM MDT	Severe Thunderstorm Warning	CYS	Banner	48 min
Jun 20, 2:47 PM MDT	Tornado Warning	CYS	Banner	48 min
Jun 20, 3:18 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	47 min
Jun 20, 3:27 PM MDT	Tornado Warning	CYS	Kimball	33 min
Jun 20, 3:33 PM MDT	Severe Thunderstorm Warning	CYS	Banner	32 min
Jun 20, 4:02 PM MDT	Tornado Warning	CYS	Cheyenne, Kimball	48 min
Jun 20, 4:08 PM MDT	Tornado Warning	CYS	Box Butte	17 min
Jun 20, 4:13 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	47 min
Jun 20, 4:42 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	33 min
Jun 20, 4:45 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	45 min
Jun 20, 5:20 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	45 min
Jun 20, 5:27 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Kimball	43 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.