Alert archive / South Carolina / Areal Flood Advisories in 2021

Areal Flood Advisory 8, NWS Columbia, SC

March 17, 20215 counties in South Carolina

NWS Columbia, SC issued this areal flood advisory at Mar 17, 2021, 1:06 AM EDT for 5 counties in South Carolina. It was in force for 114 min.

The area

The counties it named.

The facts

Issued: Mar 17, 2021, 1:06 AM EDT (05:06 UTC)
Expired: Mar 17, 2021, 3:00 AM EDT
In force: 114 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

Counties Calhoun County, SC, Clarendon County, SC, Lexington County, SC, Richland County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 40 km from the middle of the area, began a volume at 05:07 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 5.1 hours before the alert went out and 355 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 427 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 331 m²/s²
0-3 km storm-relative helicity: 364 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 Columbia, SC wrote its last area forecast discussion before this areal flood advisory went out at Mar 16, 10:46 PM EDT, 2 hours 20 minutes earlier.

Area forecast discussion, Mar 16, 10:46 PM EDT, 2 hours 20 minutes before

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Hazardous weather outlook, Mar 16, 4:46 AM EDT, 20 hours 20 minutes 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 Columbia, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 16, 11:35 PM EDT	Areal Flood Advisory	CAE	Edgefield, McCormick, Saluda	115 min
Mar 17, 6:21 AM EDT	River Flood Warning	CAE	Edgefield, McCormick	18 hr

Nearby

Areal Flood Advisories in South 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.