Alert archive / North Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Raleigh, NC

August 23, 2017Durham County, North Carolina

NWS Raleigh, NC issued this special weather statement at Aug 23, 2017, 1:49 PM EDT for Durham County, North Carolina. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 23, 2017, 1:49 PM EDT (17:49 UTC)
Expired: Aug 23, 2017, 2:30 PM EDT
In force: 41 min
Issued by: NWS Raleigh, NC

County Durham County, NC

The radar

The Raleigh/Durham radar (KRAX), 66 km from the middle of the area, began a volume at 17:51 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, 5.8 hours before the alert went out and 88 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 333 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1315 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 23, 10:31 AM EDT, 3 hours 18 minutes earlier.

Area forecast discussion, Aug 23, 10:31 AM EDT, 3 hours 18 minutes before

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Hazardous weather outlook, Aug 23, 4:16 AM EDT, 9 hours 33 minutes before

Hazardous Weather Outlook
National Weather Service Raleigh NC
416 AM EDT Wed Aug 23 2017

NCZ007>011-021>028-038>043-073>078-083>086-088-089-240830-
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 23 2017

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Today and Tonight.

Scattered thunderstorms are expected to develop this afternoon and
evening, ahead of a strong cold front moving into the region. Some
storms could become severe, with the greatest threat coming from
damaging thunderstorm gusts. Frequent cloud to ground lightning
will also pose a threat.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

In the hours before

Special weather statement, Aug 23, 1:24 PM EDT, 25 minutes before

Special Weather Statement
National Weather Service Raleigh NC
124 PM EDT WED AUG 23 2017

NCZ007-231815-
Person NC-
124 PM EDT WED AUG 23 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN PERSON COUNTY UNTIL 215
PM EDT...

At 123 PM EDT, Doppler radar was tracking a strong thunderstorm near
Prospect Hill, moving east at 30 mph.

Wind gusts of 40 to 50 mph will be possible with this storm.

Locations impacted include...
Roxboro, Bushy Fork, Surl and Moriah.

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. Move indoors at the first sound of thunder.

&&

LAT...LON 3624 7881 3624 7894 3625 7915 3638 7915
      3640 7880
TIME...MOT...LOC 1723Z 270DEG 28KT 3632 7915

GIH

Special weather statement, Aug 23, 1:49 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Raleigh NC
149 PM EDT WED AUG 23 2017

NCZ008-024-025-231830-
Durham NC-Granville NC-Orange NC-
149 PM EDT WED AUG 23 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN ORANGE...
SOUTHWESTERN GRANVILLE AND NORTHERN DURHAM COUNTIES UNTIL 230 PM
EDT...

At 149 PM EDT, Doppler radar was tracking a strong thunderstorm near
Rougemont, or 10 miles northeast of Hillsborough, moving east at 30
mph.

Wind gusts of 40 to 50 mph will be possible with this storm.

Locations impacted include...
Durham, Creedmoor, Butner, Rougemont, Stem, Lake Michie, Lake Butner,
Gorman, Bahama and Schley.

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. Move indoors at the first sound of thunder.

&&

LAT...LON 3614 7911 3624 7898 3621 7861 3602 7880
TIME...MOT...LOC 1749Z 281DEG 28KT 3618 7898

GIH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 1:24 PM EDT	Special Weather Statement	RAH	Person	51 min
Aug 23, 2:15 PM EDT	Special Weather Statement	RAH	Orange	45 min
Aug 23, 3:41 PM EDT	Special Weather Statement	RAH	Guilford	64 min
Aug 23, 3:49 PM EDT	Special Weather Statement	RAH	Franklin	56 min
Aug 23, 4:17 PM EDT	Severe Thunderstorm Warning	RAH	Franklin, Nash	43 min
Aug 23, 4:33 PM EDT	Special Weather Statement	RAH	Moore	57 min
Aug 23, 4:48 PM EDT	Special Weather Statement	RAH	Halifax	57 min
Aug 23, 5:04 PM EDT	Special Weather Statement	RAH	Johnston	56 min
Aug 23, 5:46 PM EDT	Areal Flood Advisory	RAH	Halifax	3 hr
Aug 23, 5:47 PM EDT	Areal Flood Advisory	RAH	Johnston	3 hr
Aug 23, 5:52 PM EDT	Severe Thunderstorm Warning	RAH	Johnston, Wayne	68 min
Aug 23, 6:00 PM EDT	Special Weather Statement	RAH	Sampson	60 min
Aug 23, 6:08 PM EDT	Severe Thunderstorm Warning	RAH	Sampson	68 min
Aug 23, 7:00 PM EDT	Special Weather Statement	RAH	Edgecombe	45 min
Aug 23, 7:53 PM EDT	Severe Thunderstorm Warning	RAH	Sampson	52 min

Nearby

Special Weather Statements in North Carolina, 2017 Every special weather statement in 2017

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.