Alert archive / Delaware / Areal Flood Advisories in 2018

Areal Flood Advisory 97, NWS Philadelphia/Mount Holly

June 23, 2018Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood advisory at Jun 23, 2018, 8:34 PM EDT for Sussex County, Delaware. It was in force for 80 min.

The area

The counties it named.

The facts

Issued: Jun 23, 2018, 8:34 PM EDT (00:34 UTC)
Expired: Jun 23, 2018, 9:54 PM EDT
In force: 80 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 18 km from the middle of the area, began a volume at 00:36 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

Brookhaven, NY (KOKX), launched 00:00Z, 0.6 hours before the alert went out and 322 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: 3 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 448 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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 Philadelphia/Mount Holly wrote its last area forecast discussion before this areal flood advisory went out at Jun 23, 5:50 PM EDT, 2 hours 44 minutes earlier.

Area forecast discussion, Jun 23, 5:50 PM EDT, 2 hours 44 minutes before

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Hazardous weather outlook, Jun 23, 4:34 PM EDT, 4 hours before

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<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.
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The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 23, 8:53 PM EDT	Areal Flood Advisory	PHI	Cape May	84 min
Jun 24, 7:22 PM EDT	Special Weather Statement	PHI	Warren	23 min
Jun 24, 7:24 PM EDT	Special Weather Statement	PHI	Hunterdon	36 min
Jun 24, 7:42 PM EDT	Special Weather Statement	PHI	Middlesex	33 min
Jun 24, 5:30 PM EDT	Special Weather Statement	PHI	Monroe	30 min
Jun 24, 5:59 PM EDT	Special Weather Statement	PHI	Berks	31 min
Jun 24, 6:04 PM EDT	Special Weather Statement	PHI	Berks	26 min
Jun 24, 6:14 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	46 min
Jun 24, 6:36 PM EDT	Special Weather Statement	PHI	Chester, Montgomery	39 min
Jun 24, 6:50 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	25 min
Jun 24, 6:52 PM EDT	Special Weather Statement	PHI	Berks	38 min
Jun 24, 7:08 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	114 min
Jun 24, 7:10 PM EDT	Special Weather Statement	PHI	Chester, Delaware, Montgomery	50 min
Jun 24, 7:32 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	28 min
Jun 24, 7:56 PM EDT	Special Weather Statement	PHI	Philadelphia	34 min

Nearby

Areal Flood Advisories in Delaware, 2018 Every areal flood advisory in 2018

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.