Alert archive / Nebraska / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 28, NWS North Platte, NE

July 6, 1987Grant County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 6, 1987, 5:51 PM MDT for Grant County, Nebraska. It was in force for 69 min.

The area

The counties it named.

The facts

Issued
Jul 6, 1987, 5:51 PM MDT (23:51 UTC)
Expired
Jul 6, 1987, 7:00 PM MDT
In force
69 min
Issued by
NWS North Platte, NE
Area
Whole counties

County Grant 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, 11.9 hours before the alert went out and 129 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 12:00Z on 1987-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1046 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 12:00Z on 1987-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 square meters per square second.1939Sfc1 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
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 062351
SVRLBF
NEC075-070100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
551 PM MDT MON JUL 6 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

NORTH CENTRAL NEBRASKA...EASTERN GRANT

RADAR INDICATES A LINE OF SEVERE THUNDERSTORMS ACROSS EAST GRANT
COUNTY NEBRASKA. MOVING EAST AT 10 MPH.

IF THREATENING WEATHER APPROACHES...GET TO A REINFORCED SHELTER AND
PREPARE FOR STRONG DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND
DANGEROUS LIGHTNING.  REMEMBER...THESE STORMS CAN AND OCCASIONALLY
DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING...SO BE ON
THE LOOKOUT!!

REPORTS OF SEVERE WEATHER OR DAMAGE CAN BE GIVEN TO A LAW
ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH...
LARGE HAIL GREATER THAN 3/"4 INCH IN DIAMETER...DEADLY LIGHTNING
AND VERY HEAVY RAIN THAT CAN FLOOD A LOW LYING AREA QUICKLY.

HETZKE2350     Z

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 5:01 PM MDTSevere Thunderstorm WarningLBFCherry51 min
Jul 6, 5:28 PM MDTTornado WarningLBFArthur32 min
Jul 6, 5:34 PM MDTTornado WarningLBFKeith26 min
Jul 6, 5:59 PM MDTTornado WarningLBFArthur, Keith31 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1987Every severe thunderstorm warning 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.