Alert archive / Pennsylvania / Dense Fog Advisories in 2026

Dense Fog Advisory 4, NWS Philadelphia/Mount Holly

February 18, 2026Carbon County, Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this dense fog advisory at Feb 18, 2026, 8:39 PM EST for Carbon County, Monroe County, Pennsylvania. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Feb 18, 2026, 8:39 PM EST (01:39 UTC)
Expired: Feb 19, 2026, 9:00 AM EST
In force: 12 hr
Issued by: NWS Philadelphia/Mount Holly

Counties Carbon County, PA, Monroe County, PA

The radar

The Binghamton radar (KBGM), 140 km from the middle of the area, began a volume at 01:39 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 Feb 18, 6:51 PM EST, 1 hour 48 minutes earlier.

Area forecast discussion, Feb 18, 6:51 PM EST, 1 hour 48 minutes before

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Hazardous weather outlook, Feb 18, 5:05 AM EST, 15 hours 34 minutes before

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    <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>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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
Feb 19, 1:51 AM EST	Winter Weather Advisory	PHI	Sussex	34 hr

Nearby

Dense Fog Advisories in Pennsylvania, 2026 Every dense fog advisory in 2026

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.