Alert archive / Nebraska / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 59, NWS North Platte, NE

July 20, 1987Cherry County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 20, 1987, 6:04 PM MDT for Cherry County, Nebraska. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
Jul 20, 1987, 6:04 PM MDT (00:04 UTC)
Expired
Jul 20, 1987, 7:00 PM MDT
In force
56 min
Issued by
NWS North Platte, NE
Area
Whole counties

County Cherry 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, 0.1 hours before the alert went out and 163 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 1987-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3222 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 1987-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
3222 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1669 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBFF 210004
SVRVTN
NEC031-210100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE VALENTINE NE
ISSUED BY SCOTTSBLUFF NE
604 PM MDT MON JUL 20 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...SOUTHWEST CHERRY

AT 5 PM MDT A SEVERE THUNDERSTORM WAS 40 MILES NORTHWEST OF MULLEN
NEBRASKA IN THE SOUTHWEST PART OF CHERRY COUNTY OF NORTH CENTRAL
NEBRASKA. THIS STORM WAS NEARLY STATIONARY.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE
OR NO WARNING...SO BE ON THE LOOKOUT.

PEOPLE IN THE WARNED AREA SHOULD GET INTO A REINFORCED SHELTER AND
PREPARE FOR DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN...AND
DANGEROUS LIGHTNING.

PERSONS DRIVING IN THE WARNED AREA SHOULD WATCH OUT FOR WATER OVER
ROADS...IN UNDERPASSES AND NEAR SMALL STREAMS.

KARR

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 7:30 PM MDTSevere Thunderstorm WarningLBFGrant60 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.