Alert archive / North Carolina / Special Weather Statements in 2020

Special Weather Statement, NWS Raleigh, NC

August 9, 2020Chatham County, North Carolina

NWS Raleigh, NC issued this special weather statement at Aug 9, 2020, 1:32 PM EDT for Chatham County, North Carolina. It was in force for 43 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 9, 2020, 1:32 PM EDT (17:32 UTC)
Expired
Aug 9, 2020, 2:15 PM EDT
In force
43 min
Issued by
NWS Raleigh, NC

County Chatham County, NC

The radar

The Raleigh/Durham radar (KRAX), 81 km from the middle of the area, began a volume at 17:35 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, 5.5 hours before the alert went out and 58 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 2020-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 733 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 2020-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -40 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
733 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
960 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-40 m²/s²
0-3 km storm-relative helicity
-28 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 9, 11:53 AM EDT, 1 hour 39 minutes earlier.

Area forecast discussion, Aug 9, 11:53 AM EDT, 1 hour 39 minutes before
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  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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Hazardous weather outlook, Aug 9, 8:06 AM EDT, 5 hours 26 minutes before
Hazardous Weather Outlook
National Weather Service Raleigh NC
806 AM EDT Sun Aug 9 2020

NCZ007>011-021>028-038>043-073>078-083>086-088-089-101215-
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-
806 AM EDT Sun Aug 9 2020

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

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

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, Aug 9, 1:32 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Raleigh NC
132 PM EDT Sun Aug 9 2020

NCZ023-040-091815-
Chatham NC-Alamance NC-
132 PM EDT Sun Aug 9 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN ALAMANCE AND
NORTHWESTERN CHATHAM COUNTIES UNTIL 215 PM EDT...

At 131 PM EDT, Doppler radar was tracking a strong thunderstorm near
Siler City, moving east at 15 mph.

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

Heavy rain and minor flooding will also be possible with this storm.

Locations impacted include...
Siler City, Staley, Sutphin, Saxapahaw and Snow Camp.

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.

Locally heavy rain will quickly reduce visibility and result in
ponding of water on roadways, standing water in low lying areas, and
minor flooding of creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning, especially in urban areas where prolonged heavy rain
can quickly lead to flooding.

&&

LAT...LON 3569 7925 3568 7955 3588 7954 3596 7929
TIME...MOT...LOC 1731Z 255DEG 15KT 3577 7948

23

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 8:16 PM EDTSpecial Weather StatementRAHWilson44 min
Aug 8, 9:08 PM EDTSpecial Weather StatementRAHWilson52 min
Aug 8, 10:16 PM EDTSpecial Weather StatementRAHWayne59 min
Aug 8, 10:42 PM EDTSevere Thunderstorm WarningRAHSampson, Wayne63 min
Aug 8, 10:52 PM EDTAreal Flood AdvisoryRAHWayne2 hr
Aug 8, 11:48 PM EDTSpecial Weather StatementRAHSampson42 min
Aug 9, 1:29 AM EDTSpecial Weather StatementRAHMoore46 min
Aug 9, 1:38 AM EDTAreal Flood AdvisoryRAHMontgomery, Moore3 hr
Aug 9, 2:24 AM EDTSpecial Weather StatementRAHMoore51 min
Aug 9, 3:32 AM EDTSpecial Weather StatementRAHHoke43 min
Aug 9, 3:34 AM EDTSpecial Weather StatementRAHRichmond41 min
Aug 9, 4:26 AM EDTAreal Flood AdvisoryRAHCumberland, Harnett, Hoke, Moore81 min
Aug 9, 4:29 AM EDTSpecial Weather StatementRAHHoke46 min
Aug 9, 3:17 PM EDTSpecial Weather StatementRAHHarnett, Lee58 min
Aug 9, 3:32 PM EDTSpecial Weather StatementRAHCumberland58 min
Aug 9, 4:16 PM EDTSpecial Weather StatementRAHWake44 min
Aug 9, 4:18 PM EDTSpecial Weather StatementRAHSampson42 min
Aug 9, 4:20 PM EDTSpecial Weather StatementRAHHarnett, Johnston40 min
Aug 9, 4:48 PM EDTAreal Flood AdvisoryRAHWake57 min
Aug 9, 5:33 PM EDTSpecial Weather StatementRAHFranklin, Nash42 min
Aug 9, 6:05 PM EDTSpecial Weather StatementRAHWilson55 min

Nearby

Special Weather Statements in North Carolina, 2020Every special weather statement in 2020

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.