Alert archive / North Carolina / Areal Flood Advisories in 2021

Areal Flood Advisory 5, NWS Raleigh, NC

April 9, 2021Alamance County, Guilford County, North Carolina

NWS Raleigh, NC issued this areal flood advisory at Apr 9, 2021, 8:53 PM EDT for Alamance County, Guilford County, North Carolina. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Apr 9, 2021, 8:53 PM EDT (00:53 UTC)
Expired: Apr 10, 2021, 12:00 AM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

Counties Alamance County, NC, Guilford County, NC

The radar

The Raleigh/Durham radar (KRAX), 109 km from the middle of the area, began a volume at 00:56 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 00:00Z, 0.9 hours before the alert went out and 28 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: 387 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1632 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 areal flood advisory went out at Apr 9, 8:23 PM EDT, 30 minutes earlier.

Area forecast discussion, Apr 9, 8:23 PM EDT, 30 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Apr 9, 3:44 PM EDT, 5 hours 9 minutes before

Hazardous Weather Outlook
National Weather Service Raleigh NC
344 PM EDT Fri Apr 9 2021

NCZ007>010-026-101200-
Person-Granville-Vance-Warren-Franklin-
344 PM EDT Fri Apr 9 2021

...SEVERE THUNDERSTORM WATCH 78 IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT...

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

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

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

NCZ021>025-041-101200-
Forsyth-Guilford-Alamance-Orange-Durham-Wake-
344 PM EDT Fri Apr 9 2021

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This afternoon and tonight.

Scattered thunderstorms this afternoon and evening will be capable of
producing damaging straight-line wind gusts and quarter-size hail.

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

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

NCZ011-027-028-101200-
Halifax-Nash-Edgecombe-
344 PM EDT Fri Apr 9 2021

...SEVERE THUNDERSTORM WATCH 78 IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT...

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

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

An isolated strong to severe thunderstorm will be possible on
Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

NCZ038>040-073>077-083>086-101200-
Davidson-Randolph-Chatham-Stanly-Montgomery-Moore-Lee-Harnett-Anson-
Richmond-Scotland-Hoke-
344 PM EDT Fri Apr 9 2021

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This afternoon and tonight.

Scattered thunderstorms this afternoon and evening will be capable of
producing damaging straight-line wind gusts and quarter-size hail.

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

Thunderstorms Saturday evening will be capable of producing damaging
straight-line wind gusts and quarter-size hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

NCZ042-078-088-089-101200-
Johnston-Wayne-Cumberland-Sampson-
344 PM EDT Fri Apr 9 2021

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This afternoon and tonight.

Scattered thunderstorms this afternoon and evening will be capable of
producing damaging straight-line wind gusts and quarter-size hail.

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

An isolated strong to severe thunderstorm will be possible on
Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

NCZ043-101200-
Wilson-
344 PM EDT Fri Apr 9 2021

...SEVERE THUNDERSTORM WATCH 78 IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT...

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

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

An isolated strong to severe thunderstorm will be possible on
Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

In the hours before

Special weather statement, Apr 9, 7:20 PM EDT, 1 hour 33 minutes before

Special Weather Statement
National Weather Service Raleigh NC
720 PM EDT Fri Apr 9 2021

NCZ008-023>025-040-041-100015-
Chatham NC-Durham NC-Alamance NC-Wake NC-Granville NC-Orange NC-
720 PM EDT Fri Apr 9 2021

...AN AREA OF SHOWERS AND STRONG THUNDERSTORMS WILL AFFECT SOUTHERN
ALAMANCE...SOUTHERN ORANGE...SOUTHWESTERN GRANVILLE...NORTHWESTERN
WAKE...DURHAM AND NORTHERN CHATHAM COUNTIES UNTIL 815 PM EDT...

At 718 PM EDT, Doppler radar was tracking an area of showers and
strong thunderstorms near across the Triangle and west towards the
Triad, moving east at 20 mph.

Pea size hail and wind gusts up to 40 mph are possible with these
storm.

Locations impacted include...
Raleigh, Durham, Cary, Chapel Hill, Oxford, Hillsborough, Creedmoor,
Wake Forest, Carrboro and Butner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storm may intensify, so be certain to monitor local radio
stations and available television stations for additional
information and possible warnings from the National Weather Service.

&&

A Severe Thunderstorm Watch remains in effect until midnight EDT for
central North Carolina.

LAT...LON 3633 7860 3581 7849 3578 7955 3591 7954
      3616 7881 3636 7880
TIME...MOT...LOC 2318Z 250DEG 16KT 3598 7901

JJT

Special weather statement, Apr 9, 7:21 PM EDT, 1 hour 32 minutes before

Special Weather Statement
National Weather Service Raleigh NC
721 PM EDT Fri Apr 9 2021

NCZ021-022-038-039-100015-
Guilford NC-Forsyth NC-Randolph NC-Davidson NC-
721 PM EDT Fri Apr 9 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN FORSYTH...
DAVIDSON...NORTHWESTERN RANDOLPH AND SOUTHWESTERN GUILFORD COUNTIES
UNTIL 815 PM EDT...

At 718 PM EDT, Doppler radar was tracking a strong thunderstorm over
Lexington, moving northeast at 20 mph.

Public is reporting pea to half inch hail in Lexington. Wind gusts
up to 40 mph will also be possible with this storm.

Locations impacted include...
Winston-Salem, High Point, Lexington, Thomasville, Linwood, Archdale,
Trinity, Gordontown, High Rock Lake and Arcadia.

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 3616 8020 3587 7987 3561 8023 3563 8026
      3563 8028 3565 8030 3567 8031 3568 8033
      3569 8034 3571 8032 3572 8033 3572 8038
      3573 8039 3572 8042 3574 8044
TIME...MOT...LOC 2318Z 215DEG 19KT 3583 8026

JD

Local storm report, Apr 9, 7:43 PM EDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
743 PM EDT FRI APR 9 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0645 PM     TSTM WND DMG     1 N ROANOKE RAPIDS      36.46N 77.65W
04/09/2021                   HALIFAX            NC   911 CALL CENTER

            TREE DOWN AT THE 600 BLOCK OF ROANOKE AVE IN
            ROANOKE RAPIDS.

&&

JD

Local storm report, Apr 9, 7:46 PM EDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
746 PM EDT FRI APR 9 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0645 PM     TSTM WND DMG     1 SSW ROANOKE RAPIDS    36.44N 77.66W
04/09/2021                   HALIFAX            NC   911 CALL CENTER

            TREE DOWN AT THE 100 BLOCK OF LOVE ST IN
            ROANOKE RAPIDS.

&&

JD

Special weather statement, Apr 9, 8:05 PM EDT, 48 minutes before

Special Weather Statement
National Weather Service Raleigh NC
805 PM EDT Fri Apr 9 2021

NCZ007-021>025-038-100100-
Guilford NC-Durham NC-Alamance NC-Forsyth NC-Person NC-Davidson NC-
Orange NC-
805 PM EDT Fri Apr 9 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ALAMANCE...SOUTHEASTERN
FORSYTH...SOUTHERN PERSON...NORTHERN ORANGE...NORTHEASTERN
DAVIDSON...GUILFORD AND NORTHWESTERN DURHAM COUNTIES UNTIL 900 PM
EDT...

At 804 PM EDT, Doppler radar was tracking a line of strong
thunderstorms along a line extending from near Rougemont to near
Kernersville. Movement was northeast at 30 mph.

Half inch hail and wind gusts up to 40 mph will be possible with
these storms. There have been multiple public reports of half inch
hail in Alamance and Orange counties.

Heavy rain and minor flooding will also be possible with these
storms.

Locations impacted include...
Greensboro, High Point, Burlington, Graham, Roxboro, Hillsborough,
Thomasville, Kernersville, Mebane and McLeansville.

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.

Frequent 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.

&&

A Severe Thunderstorm Watch remains in effect until midnight EDT for
central North Carolina.

LAT...LON 3614 7881 3590 7955 3592 8001 3591 8005
      3591 8025 3626 8003 3624 7915 3640 7914
      3640 7880
TIME...MOT...LOC 0004Z 226DEG 25KT 3623 7884 3608 8007

JD

Special weather statement, Apr 9, 8:13 PM EDT, 40 minutes before

Special Weather Statement
National Weather Service Raleigh NC
813 PM EDT Fri Apr 9 2021

NCZ009>011-026-100115-
Franklin NC-Vance NC-Warren NC-Halifax NC-
813 PM EDT Fri Apr 9 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT VANCE...WARREN...
NORTHWESTERN HALIFAX AND NORTHERN FRANKLIN COUNTIES UNTIL 915 PM
EDT...

At 813 PM EDT, Doppler radar was tracking a line of strong
thunderstorms along a line extending from Littleton to near Kittrell.
Movement was east at 20 mph.

Pea size hail and wind gusts up to 40 mph will be possible with these
storms.

Heavy rain and minor flooding will also be possible with these
storms.

Locations impacted include...
Roanoke Rapids, Henderson, Warrenton, Norlina, Littleton, Kittrell,
Weldon, Middleburg, Macon and Centerville.

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.

&&

A Severe Thunderstorm Watch remains in effect until midnight EDT for
central North Carolina.

LAT...LON 3652 7790 3651 7790 3648 7776 3648 7765
      3644 7762 3642 7759 3642 7756 3640 7755
      3618 7792 3619 7797 3618 7798 3620 7801
      3616 7804 3615 7849 3617 7850 3640 7851
      3653 7804
TIME...MOT...LOC 0013Z 257DEG 16KT 3645 7791 3621 7851

JD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 8:05 PM EDT	Special Weather Statement	RAH	Alamance, Guilford, Orange, Person	55 min
Apr 9, 8:13 PM EDT	Special Weather Statement	RAH	Vance, Warren	62 min
Apr 9, 9:22 PM EDT	Special Weather Statement	RAH	Durham, Orange	53 min
Apr 9, 10:14 PM EDT	Special Weather Statement	RAH	Wake	46 min
Apr 9, 11:05 PM EDT	Special Weather Statement	RAH	Granville	40 min

Nearby

Areal Flood Advisories in North Carolina, 2021 Every areal flood advisory in 2021

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.