Alert archive / North Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Raleigh, NC

June 18, 2017Chatham County, North Carolina

NWS Raleigh, NC issued this special weather statement at Jun 18, 2017, 2:49 PM EDT for Chatham County, North Carolina. It was in force for 56 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: Jun 18, 2017, 2:49 PM EDT (18:49 UTC)
Expired: Jun 18, 2017, 3:45 PM EDT
In force: 56 min
Issued by: NWS Raleigh, NC

County Chatham County, NC

The radar

The Raleigh/Durham radar (KRAX), 90 km from the middle of the area, began a volume at 18:48 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, 6.8 hours before the alert went out and 56 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: 711 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 664 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 3 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 Jun 18, 2:33 PM EDT, 16 minutes earlier.

Area forecast discussion, Jun 18, 2:33 PM EDT, 16 minutes before

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Hazardous weather outlook, Jun 18, 2:35 PM EDT, 14 minutes before

Hazardous Weather Outlook
National Weather Service Raleigh NC
235 PM EDT Sun Jun 18 2017

NCZ007>011-021>028-038>043-073>078-083>086-088-089-191845-
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-
235 PM EDT Sun Jun 18 2017

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This Afternoon and Tonight.

An isolated severe thunderstorm is possible this afternoon. The most
likely threat would be from damaging wind gusts.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

A few strong to severe storms are possible Monday through Tuesday.
The main threat will be from damaging wind gusts over 60 mph,
although large hail over an inch in diameter is also possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jun 18, 2:49 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Raleigh NC
249 PM EDT SUN JUN 18 2017

NCZ039-040-075-181945-
Chatham NC-Randolph NC-Moore NC-
249 PM EDT SUN JUN 18 2017

...A strong thunderstorm will affect portions of western Chatham...
southeastern Randolph and north central Moore Counties Until 345 PM
EDT...

At 248 PM EDT, Doppler radar was tracking a strong thunderstorm 9
miles southeast of North Carolina Zoo, moving northeast at 20 mph.

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

Heavy rain and minor flooding and deadly cloud to ground lightning
will also be possible with this storm.

Locations impacted include...
Siler City, Goldston, Harpers Crossroads, Coleridge and Hasty.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3584 7948 3584 7941 3565 7920 3545 7962
      3557 7975
TIME...MOT...LOC 1848Z 225DEG 18KT 3556 7961

KDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 8:05 PM EDT	Severe Thunderstorm Warning	RAH	Guilford, Randolph	55 min
Jun 17, 8:56 PM EDT	Special Weather Statement	RAH	Guilford	49 min
Jun 18, 3:25 PM EDT	Special Weather Statement	RAH	Lee	50 min
Jun 18, 3:36 PM EDT	Special Weather Statement	RAH	Chatham	54 min
Jun 18, 4:08 PM EDT	Special Weather Statement	RAH	Harnett	67 min
Jun 18, 4:30 PM EDT	Special Weather Statement	RAH	Wake	45 min
Jun 18, 4:34 PM EDT	Special Weather Statement	RAH	Wake	41 min
Jun 18, 5:26 PM EDT	Special Weather Statement	RAH	Granville	49 min
Jun 18, 5:32 PM EDT	Special Weather Statement	RAH	Wake	43 min
Jun 18, 6:11 PM EDT	Special Weather Statement	RAH	Vance, Warren	64 min
Jun 18, 7:29 PM EDT	Special Weather Statement	RAH	Edgecombe	46 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.