Alert archive / North Carolina / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 21, NWS Blacksburg, VA

August 11, 1986Alamance County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 11, 1986, 5:38 PM EDT for Alamance County, North Carolina. It was in force for 67 min.

The area

The counties it named.

The facts

Issued
Aug 11, 1986, 5:38 PM EDT (21:38 UTC)
Expired
Aug 11, 1986, 6:45 PM EDT
In force
67 min
Issued by
NWS Blacksburg, VA
Area
Whole counties

County Alamance County, NC

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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.6 hours before the alert went out and 45 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, Greensboro/Hi Pt, NC at 12:00Z on 1986-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 688 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, Greensboro/Hi Pt, NC at 12:00Z on 1986-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
688 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
762 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGSO 112138
SVRGSO
NCC001-112245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENSBORO NC
538 PM EDT MON AUG 11 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 645 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

NORTH CAROLINA...SOUTHERN ALAMANCE

AT 536 PM RADAR SHOWED A SEVERE THUNDERSTORM IN SOUTH CENTRAL
ALAMANCE COUNTY MOVING EAT AT 30 MPH.

PEOPLE IN T@HE PATH OF THIS STORM SHOULD BE ALERT FOR THE POSSIBILITY
OF LARGE HAIL...DAMAGING WINDS...FREQUENT LIGHTNING AND LOCALLY HEAVY
RAIN. REPORT ANY SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY.

 RBN

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 11, 2:52 PM EDTSevere Thunderstorm WarningRNKAlamance68 min
Aug 11, 4:27 PM EDTSevere Thunderstorm WarningRNKDavidson, Rowan63 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 1986Every severe thunderstorm warning in 1986

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.