Alert archive / Nebraska / Tornado Warnings in 1987

Tornado Warning 11, NWS North Platte, NE

July 6, 1987Arthur County, Keith County, Nebraska

NWS North Platte, NE issued this tornado warning at Jul 6, 1987, 5:59 PM MDT for Arthur County, Keith County, Nebraska. It was in force for 31 min.

The area

The counties it named.

The facts

Issued: Jul 6, 1987, 5:59 PM MDT (23:59 UTC)
Expired: Jul 6, 1987, 6:30 PM MDT
In force: 31 min
Issued by: NWS North Platte, NE
Area: Whole counties

Counties Arthur County, NE, Keith County, NE

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 12.0 hours before the alert went out and 94 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: 1046 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 1747 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 062359
TORLBF
NEC005-101-070030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
659 PM CDT MON JUL 6 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 730 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

NORTH CENTRAL NEBRASKA...SOUTHERN ARTHUR AND NORTHERN KEITH

RADAR INDICATED A POSSIBLE TORNADO 15 MILES NORTH NORTHWEST OF
LEMOYNE IN KEITH COUNTY MOVING EAST AT ABOUT 5 MPH.

IF YOU ARE NEAR THE PATH OF THIS TORNADO...YOU SHOULD GO TO A
BASEMENT SHELTER IF AVAILABLE.  OTHERWISE GO TO A CENTRAL ROOM ON
THE LOWEST FLOOR POSSIBLE.  ABANDON CARS AND MOBILE HOMES FOR A
REINFORCED BUILDIN/G.

REPORTS OF TORNADOS OR TORNADO DAMAGE SHOULD BE GIVEN TO A LAW
ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE.

COFFIN 062358Z

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 5:01 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	51 min
Jul 6, 5:28 PM MDT	Tornado Warning	LBF	Arthur	32 min
Jul 6, 5:34 PM MDT	Tornado Warning	LBF	Keith	26 min
Jul 6, 5:51 PM MDT	Severe Thunderstorm Warning	LBF	Grant	69 min

Nearby

Tornado Warnings in Nebraska, 1987 Every tornado warning in 1987 Tornadoes in 1987

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.