Alert archive / North Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Raleigh, NC

July 28, 2017Halifax County, North Carolina

NWS Raleigh, NC issued this special weather statement at Jul 28, 2017, 3:01 PM EDT for Halifax County, North Carolina. It was in force for 44 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
Jul 28, 2017, 3:01 PM EDT (19:01 UTC)
Expired
Jul 28, 2017, 3:45 PM EDT
In force
44 min
Issued by
NWS Raleigh, NC

County Halifax County, NC

The radar

The Norfolk radar (KAKQ), 88 km from the middle of the area, began a volume at 19:01 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

Newport, NC (KMHX), launched 12:00Z, 7.0 hours before the alert went out and 176 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, Newport, NC at 12:00Z on 2017-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 546 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, Newport, NC at 12:00Z on 2017-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.1939Sfc1 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
546 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
857 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
25 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

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 Jul 28, 1:20 PM EDT, 1 hour 41 minutes earlier.

Area forecast discussion, Jul 28, 1:20 PM EDT, 1 hour 41 minutes before
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Hazardous weather outlook, Jul 28, 2:07 PM EDT, 54 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Raleigh NC
207 PM EDT Fri Jul 28 2017

NCZ021>024-038>040-042-073>078-083>086-088-089-290930-
Forsyth-Guilford-Alamance-Orange-Davidson-Randolph-Chatham-Johnston-
Stanly-Montgomery-Moore-Lee-Harnett-Wayne-Anson-Richmond-Scotland-
Hoke-Cumberland-Sampson-
207 PM EDT Fri Jul 28 2017

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This Afternoon and Tonight.

An unseasonably strong cold front will move into the region tonight
through early Saturday. Scattered thunderstorms are expected to
develop ahead of the front, some of which may be severe. The primary
severe weather threat will be damaging wind gusts. The severe weather
threat appears greatest between 5 PM and 11 PM.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ007>011-025>028-041-043-290930-
Person-Granville-Vance-Warren-Halifax-Durham-Franklin-Nash-Edgecombe-
Wake-Wilson-
207 PM EDT Fri Jul 28 2017

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This Afternoon and Tonight.

An unseasonably strong cold front will move into the region tonight
through early Saturday. Scattered thunderstorms will develop ahead
of the front. A few of the storms could become severe, with damaging
wind gusts the primary threat. An isolated weak tornado cannot be
ruled out. The severe weather threat appears to be best between 5 PM
and 11 PM.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jul 28, 1:47 PM EDT, 1 hour 14 minutes before
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Special weather statement, Jul 28, 3:01 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Raleigh NC
301 PM EDT FRI JUL 28 2017

NCZ011-281945-
Halifax NC-
301 PM EDT FRI JUL 28 2017

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL HALIFAX COUNTY
UNTIL 345 PM EDT...

At 258 PM EDT, Doppler radar was tracking a strong thunderstorm
about 5 miles southeast of Halifax, near Rich Square, moving east at
20 mph.

Wind gusts up to 40 mph and frequent lightning will be possible with
this storm. People outdoors along the Roanoke river should be alert
for this storm and seek shelter indoors until it has passed.

Locations impacted include...
Halifax and Tillery.

LAT...LON 3623 7738 3620 7753 3634 7762 3635 7758
      3634 7759 3630 7755 3631 7750 3632 7747
      3632 7744 3629 7741 3626 7741 3625 7738
TIME...MOT...LOC 1858Z 253DEG 18KT 3634 7733

13

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 8:34 PM EDTSpecial Weather StatementRAHAlamance, Durham, Franklin, Orange56 min
Jul 28, 1:47 PM EDTSpecial Weather StatementRAHWake43 min
Jul 28, 3:52 PM EDTSpecial Weather StatementRAHWarren53 min
Jul 28, 3:54 PM EDTSpecial Weather StatementRAHFranklin66 min
Jul 28, 4:16 PM EDTSpecial Weather StatementRAHHalifax59 min
Jul 28, 4:20 PM EDTAreal Flood AdvisoryRAHHalifax115 min
Jul 28, 5:19 PM EDTSpecial Weather StatementRAHDavidson, Forsyth41 min
Jul 28, 5:25 PM EDTSpecial Weather StatementRAHWake65 min
Jul 28, 5:26 PM EDTSevere Thunderstorm WarningRAHAnson, Stanly53 min
Jul 28, 5:47 PM EDTSevere Thunderstorm WarningRAHDavidson, Randolph30 min
Jul 28, 6:07 PM EDTSpecial Weather StatementRAHDavidson, Forsyth53 min
Jul 28, 6:08 PM EDTSpecial Weather StatementRAHFranklin67 min
Jul 28, 6:21 PM EDTSevere Thunderstorm WarningRAHFranklin, Wake44 min
Jul 28, 6:59 PM EDTSpecial Weather StatementRAHFranklin, Vance, Warren61 min
Jul 28, 7:07 PM EDTAreal Flood AdvisoryRAHWake3 hr
Jul 28, 7:36 PM EDTSpecial Weather StatementRAHHalifax54 min

Nearby

Special Weather Statements in North Carolina, 2017Every 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.