Alert archive / North Carolina / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 170, NWS Raleigh, NC

August 7, 20194 counties in North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Aug 7, 2019, 1:16 PM EDT for 4 counties in North Carolina. It was in force for 74 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 7, 2019, 1:16 PM EDT (17:16 UTC)
Expired
Aug 7, 2019, 2:30 PM EDT
In force
74 min
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Durham County, NC, Granville County, NC, Person County, NC, Vance County, NC

The radar

The Raleigh/Durham radar (KRAX), 71 km from the middle of the area, began a volume at 17:19 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 5.3 hours before the alert went out and 107 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 2019-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 840 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 2019-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
840 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1125 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.4

Open this sounding in Storm Lab

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.

NWS Raleigh, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 7, 12:48 PM EDT, 28 minutes earlier.

Area forecast discussion, Aug 7, 12:48 PM EDT, 28 minutes before
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Hazardous weather outlook, Aug 7, 4:16 AM EDT, 9 hours before
Hazardous Weather Outlook
National Weather Service Raleigh NC
416 AM EDT Wed Aug 7 2019

NCZ007>011-021>028-038>043-073>078-083>086-088-089-081000-
Person-Granville-Vance-Warren-Halifax-Forsyth-Guilford-Alamance-
Orange-Durham-Franklin-Nash-Edgecombe-Davidson-Randolph-Chatham-Wake-
Johnston-Wilson-Stanly-Montgomery-Moore-Lee-Harnett-Wayne-Anson-
Richmond-Scotland-Hoke-Cumberland-Sampson-
416 AM EDT Wed Aug 7 2019

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Today and tonight.

Scattered strong to severe thunderstorms will be possible late this
afternoon through the evening hours. The main severe weather hazards
will be damaging wind gusts 60 to 65 mph, along with marginally large
hail.

At this time, the severe weather threat appears greatest between 4 PM
and 8 PM in the northwest Piedmont including the Triad region, and
between 6 PM and 11 PM across the remainder of central North
Carolina.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed across central NC late this
afternoon through this evening.

In the hours before

Special weather statement, Aug 7, 12:17 PM EDT, 59 minutes before
Special Weather Statement
National Weather Service Raleigh NC
1217 PM EDT Wed Aug 7 2019

NCZ022>024-038>040-071730-
Guilford NC-Chatham NC-Alamance NC-Randolph NC-Davidson NC-Orange NC-
1217 PM EDT Wed Aug 7 2019

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ALAMANCE...SOUTHEASTERN
DAVIDSON...ORANGE...RANDOLPH...GUILFORD AND NORTHWESTERN CHATHAM
COUNTIES UNTIL 130 PM EDT...

At 1216 PM EDT, Doppler radar was tracking a line of strong
thunderstorms along a line extending from near Elon to 9 miles east
of High Rock Lake. Movement was east at 20 mph.

Wind gusts up to 50 mph will be possible with these storms.

Heavy rain and deadly cloud to ground lightning will also be
possible with these storms.

Locations impacted include...
Greensboro, High Point, Burlington, Asheboro, Graham, Hillsborough,
Randleman, Siler City, North Carolina Zoo and Thomasville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter in a nearby building or vehicle. Wind gusts as high as
50 mph are capable of knocking down small or weakened trees and
blowing around trash cans, potted plants, lawn furniture and other
light outdoor objects.

Cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3624 7969 3624 7895 3584 7916 3551 7957
      3551 8008 3556 8021 3558 8021 3565 8030
TIME...MOT...LOC 1616Z 268DEG 17KT 3611 7955 3562 8013

77
Special weather statement, Aug 7, 1:05 PM EDT, 11 minutes before
Special Weather Statement
National Weather Service Raleigh NC
105 PM EDT Wed Aug 7 2019

NCZ007-071800-
Person NC-
105 PM EDT Wed Aug 7 2019

...A DEVELOPING STRONG THUNDERSTORM WILL AFFECT PERSON COUNTY UNTIL
200 PM EDT...

At 104 PM EDT, Doppler radar was tracking a strong thunderstorm over
Roxboro, moving northeast at 15 mph. Additional strong to severe
thunderstorms are expected to move into Person County from the
southeast shortly.

Pea size hail, heavy rainfall, and wind gusts up to 50 mph will be
possible with this storm.

Locations impacted include...
Roxboro, Concord, Bethel Hill, Bushy Fork, Hyco Lake, Moriah, Mayo
Reservoir, Hyco Marina and Surl.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter in a nearby building or vehicle. Wind gusts as high as
50 mph are capable of knocking down small or weakened trees and
blowing around trash cans, potted plants, lawn furniture and other
light outdoor objects.

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3624 7881 3624 7915 3654 7914 3654 7880
TIME...MOT...LOC 1704Z 238DEG 13KT 3640 7901

MORROW

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 10:57 PM EDTSpecial Weather StatementRAHGuilford33 min
Aug 7, 1:42 AM EDTSpecial Weather StatementRAHAlamance48 min
Aug 7, 12:17 PM EDTSpecial Weather StatementRAHAlamance, Guilford, Orange, Randolph73 min
Aug 7, 12:45 PM EDTSevere Thunderstorm WarningRAHAlamance, Chatham, Guilford, Orange, Randolph63 min
Aug 7, 1:05 PM EDTSpecial Weather StatementRAHPerson55 min
Aug 7, 1:20 PM EDTAreal Flood AdvisoryRAHAlamance, Guilford65 min
Aug 7, 2:16 PM EDTSpecial Weather StatementRAHWake44 min
Aug 7, 2:34 PM EDTSpecial Weather StatementRAHFranklin, Halifax, Vance, Warren71 min
Aug 7, 2:40 PM EDTSevere Thunderstorm WarningRAHFranklin, Halifax, Nash, Vance, Warren80 min
Aug 7, 2:49 PM EDTSpecial Weather StatementRAHLee56 min
Aug 7, 3:14 PM EDTSpecial Weather StatementRAHNash46 min
Aug 7, 3:26 PM EDTSpecial Weather StatementRAHEdgecombe64 min
Aug 7, 3:37 PM EDTSevere Thunderstorm WarningRAHEdgecombe, Halifax, Nash53 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2019Every severe thunderstorm warning in 2019

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; radar from the NEXRAD Level II archive.