Alert archive / North Carolina / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 75, NWS Raleigh, NC

August 11, 1986Franklin County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Aug 11, 1986, 2:41 PM EDT for Franklin County, North Carolina. It was in force for 64 min.

The area

The counties it named.

The facts

Issued
Aug 11, 1986, 2:41 PM EDT (18:41 UTC)
Expired
Aug 11, 1986, 3:45 PM EDT
In force
64 min
Issued by
NWS Raleigh, NC
Area
Whole counties

County Franklin 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, 6.7 hours before the alert went out and 145 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

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Aug 11, 10:33 AM EDT, 4 hours 8 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE  GREENSBORO NC
1035 AN EDT MON AUG 11 1986

ATTN SELS...

...INFORMATION IS DAMAGE THAT OCCURRED 8/10/1986...

605 PM EDT 1605 CST..IN HOLLY SPRINGS..SURRY COUNTY NC..ROOF BLOWN OFF
     CINDER BLOCK BLDG THAT HAD BEEN CONVERTED TO A CHURCH. ROOF LANDED
     IN PARKING AREA. CAUSED $15,000 DAMAGE..MOSTLY TO 3 CARS THAT WERE
     HIT BY THE ROOF DEBRIS. FEW TREES ALSO UPROOTED. EMERGENCY MNGMT
     INSPECTED THE AREA AND SAID CAUSED BY STRAIGHT LINE WINDS.

RBN
Special weather statement, Aug 11, 1:49 PM EDT, 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH/DURHAM, NC
 147 PM EDT MON AUG 11 1986

...THUNDERSTORMS BEGINNING TO DEVELOP ACROSS NORTH CAROLINA...

AT 140 PM EDT.. WEATHER RADAR SHOWED SCATTERED THUNDERSTORMS
DEVELOPING OVER THE PIEDMONT..FOOTHILLS AND MOUNTAINS OF NORTH
CAROLINA.

IN THE NORTHEAST PIEDMONT.. AN INTENSE THUNDERSTORM HAS DEVELOPED
RAPIDLY NEAR THE DURHAM-GRANVILLE COUNTY LINE AND IS LIKELY TO
AFFECT SOUTHERN GRANVILLE COUNTY BY 230 PM.  ANOTHER STRONG
THUNDERSTORM HAS BEEN DETECTED JUST SOUTHWEST OF KERR LAKE NORTH
OF HENDERSON.  THESE THUNDERSTORMS HAVE BEEN MOVING NORTHEAST AT
25 MILES AN HOUR.

PEOPLE IN THE PATH OF THESE STORMS MAY EXPERIENCE INTENSE LIGHTNING
..SUDDEN GUSTY WIND.. AND POSSIBLY SOME HAIL. ALSO HEAVY RAIN MAY
CAUSE HAZARDOUS DRIVING BECAUSE OF REDUCED VISIBILITY AND PONDING OF
 WATER ON HIGHWAYS.

LISTN TO LOCAL RADIO..TV..OR WEATHER RADIO FOR LATER STATEMENTS OF
POSSIBLE WARNINGS.

RFG

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 11, 2:06 PM EDTSevere Thunderstorm WarningRAHGranville, Vance69 min
Aug 11, 2:57 PM EDTSevere Thunderstorm WarningRAHOrange43 min
Aug 11, 3:26 PM EDTSevere Thunderstorm WarningRAHDurham34 min
Aug 11, 3:45 PM EDTSevere Thunderstorm WarningRAHWake30 min
Aug 11, 4:17 PM EDTSevere Thunderstorm WarningRAHHalifax33 min
Aug 11, 4:20 PM EDTSevere Thunderstorm WarningRAHFranklin40 min
Aug 11, 4:53 PM EDTSevere Thunderstorm WarningRAHHalifax67 min
Aug 11, 5:44 PM EDTSevere Thunderstorm WarningRAHOrange56 min
Aug 11, 7:12 PM EDTSevere Thunderstorm WarningRAHWake48 min
Aug 11, 7:29 PM EDTSevere Thunderstorm WarningRAHGreene, Pitt61 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.