Alert archive / Nebraska / Tornado Warnings in 1987

Tornado Warning 7, NWS North Platte, NE

June 27, 1987Keith County, Nebraska

NWS North Platte, NE issued this tornado warning at Jun 27, 1987, 8:08 PM MDT for Keith County, Nebraska. It was in force for 67 min.

The area

The counties it named.

The facts

Issued
Jun 27, 1987, 8:08 PM MDT (02:08 UTC)
Expired
Jun 27, 1987, 9:15 PM MDT
In force
67 min
Issued by
NWS North Platte, NE
Area
Whole counties

County 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 00:00Z, 2.1 hours before the alert went out and 89 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 1987-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1847 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 1987-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1847 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
1834 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
306 m²/s²
Significant tornado parameter
0.3
Supercell composite
10.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 280208
TORLBF
NEC101-280315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
908 PM CDT SAT JUN 27 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 1015 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

SOUTHWEST NEBRASKA...CENTRAL KEITH

A TORNADO WAS REPORTED 5 MILES NORTH OF SANDY BEACH OR NORTHEAST OF
LAKE MCCONAUGHY..MOVING SOUTHEAST..REPORTED BY CITIZEN

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 BUILDING.

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

HORN 280202    Z

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 6:52 PM MDTSevere Thunderstorm WarningLBFMcPherson68 min
Jun 27, 7:18 PM MDTSevere Thunderstorm WarningLBFArthur47 min
Jun 27, 7:31 PM MDTSevere Thunderstorm WarningLBFKeith54 min
Jun 27, 7:55 PM MDTSevere Thunderstorm WarningLBFKeith55 min
Jun 28, 5:54 PM MDTSevere Thunderstorm WarningLBFLincoln36 min

Nearby

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