Alert archive / Pennsylvania / Dense Fog Advisories in 2018

Dense Fog Advisory 18, NWS Philadelphia/Mount Holly

December 14, 2018Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this dense fog advisory at Dec 14, 2018, 7:44 AM EST for Chester County, Pennsylvania. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Dec 14, 2018, 7:44 AM EST (12:44 UTC)
Expired: Dec 14, 2018, 11:00 AM EST
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 12:43 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.

What forecasters said that day

The local office's own words before this dense fog 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 dense fog advisory went out at Dec 14, 3:16 AM EST, 4 hours 28 minutes earlier.

Area forecast discussion, Dec 14, 3:16 AM EST, 4 hours 28 minutes before

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Hazardous weather outlook, Dec 14, 3:20 AM EST, 4 hours 24 minutes before

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In the hours before

Special weather statement, Dec 14, 5:39 AM EST, 2 hours 5 minutes before

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<head>
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  <link rel="stylesheet" href="index.css">
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<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.
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      <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
Dec 14, 3:46 PM EST	Small Craft Advisory	PHI		44 hr

Nearby

Dense Fog Advisories in Pennsylvania, 2018 Every dense fog 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; radar from the NEXRAD Level II archive.