Alert archive / North Carolina / Areal Flood Advisories in 2009

Areal Flood Advisory 21, NWS Raleigh, NC

June 5, 2009Alamance County, Orange County, Person County, North Carolina

NWS Raleigh, NC issued this areal flood advisory at Jun 5, 2009, 12:20 PM EDT for Alamance County, Orange County, Person County, North Carolina. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jun 5, 2009, 12:20 PM EDT (16:20 UTC)
Expired: Jun 5, 2009, 3:10 PM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

Counties Alamance County, NC, Orange County, NC, Person County, NC

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 4.3 hours before the alert went out and 67 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: 265 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 476 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Jun 5, 11:55 AM EDT, 25 minutes earlier.

Area forecast discussion, Jun 5, 11:55 AM EDT, 25 minutes before

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Hazardous weather outlook, Jun 5, 11:55 AM EDT, 25 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 9:37 AM EDT	Areal Flood Advisory	RAH	Davidson	4 hr
Jun 5, 10:04 AM EDT	Flash Flood Warning	RAH	Forsyth	3 hr
Jun 5, 10:28 AM EDT	Flash Flood Warning	RAH	Guilford	3 hr
Jun 5, 10:30 AM EDT	Areal Flood Advisory	RAH	Randolph	3 hr
Jun 5, 11:13 AM EDT	Flash Flood Warning	RAH	Davidson	115 min
Jun 5, 2:05 PM EDT	River Flood Warning	RAH	Alamance	17 hr
Jun 5, 7:01 PM EDT	River Flood Warning	RAH	Chatham	17 hr

Nearby

Areal Flood Advisories in North Carolina, 2009 Every areal flood advisory in 2009

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.