Alert archive / North Carolina / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 1, NWS Raleigh, NC

April 12, 1987Orange County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Apr 12, 1987, 6:22 PM EDT for Orange County, North Carolina. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Apr 12, 1987, 6:22 PM EDT (22:22 UTC)
Expired
Apr 12, 1987, 7:10 PM EDT
In force
48 min
Issued by
NWS Raleigh, NC
Area
Whole counties

County Orange 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, 10.4 hours before the alert went out and 70 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 1987-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1987-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2322 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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

Special weather statement, Apr 12, 5:48 PM EDT, 34 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENSBORO NC
 547PM EDT SUN APR 12 1987

 AT 540 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A HEAVY
THUNDERSTORM IN SOUTHWEST ROCKINGHAM COUNTY NORTH CAROLINA.

THIS STORM IS CAPABLE OF PRODUCING STRONG GUSTY WINDS...LOCALLY
HEAVY DOWNPOURS...DANGEROUS LIGHTNING AND POSSIBLE HAIL.

MOVEMENT OF THIS STORM IS TO THE EAST AT ABOUT 30 MILES AN HOUR.

                            4

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 12, 7:21 PM EDTSevere Thunderstorm WarningRAHWake49 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 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.