Alert archive / New Jersey / Dense Fog Advisories in 2018

Dense Fog Advisory 11, NWS Philadelphia/Mount Holly

May 19, 201810 counties in New Jersey; 8 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this dense fog advisory at May 19, 2018, 9:27 PM EDT for 10 counties in New Jersey; 8 counties in Pennsylvania. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: May 19, 2018, 9:27 PM EDT (01:27 UTC)
Expired: May 20, 2018, 6:00 AM EDT
In force: 9 hr
Issued by: NWS Philadelphia/Mount Holly

Counties Burlington County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 01:30 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 May 19, 7:50 PM EDT, 1 hour 37 minutes earlier.

Area forecast discussion, May 19, 7:50 PM EDT, 1 hour 37 minutes before

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Hazardous weather outlook, May 19, 7:38 PM EDT, 1 hour 49 minutes before

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In the hours before

Special weather statement, May 19, 4:17 PM EDT, 5 hours 10 minutes before

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Special weather statement, May 19, 7:23 PM EDT, 2 hours 4 minutes before

Special Weather Statement
National Weather Service Mount Holly NJ
723 PM EDT Sat May 19 2018

NJZ001-007>010-PAZ054-055-060>062-101-103-105-200215-
Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Berks-
Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks-
Including the cities of Newton, Washington, Morristown,
Flemington, Somerville, Jim Thorpe, Stroudsburg, Reading,
Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville,
Pottstown, Chalfont, and Perkasie
723 PM EDT Sat May 19 2018

...Areas of locally dense fog across southeastern Pennsylvania
and northern New Jersey this evening into the overnight hours...

Fog has developed this evening in the vicinity of the Interstate
76 corridor in New Jersey westward into the Southern Poconos and
Lehigh Valley of southeastern Pennsylvania.

Fog will persist through this evening and the overnight hours,
with visibility down to around one-quarter of a mile at times,
which will impact those with travel plans.

If driving, use low-beam headlights, reduce speed, maintain a
safe following distance between vehicles, and allow for extra
time to reach your destination.

LF

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 3:49 PM EDT	Special Marine Warning	PHI		56 min
May 20, 4:42 PM EDT	Special Marine Warning	PHI		93 min
May 20, 6:33 PM EDT	Special Marine Warning	PHI		87 min
May 20, 6:39 PM EDT	Special Weather Statement	PHI	Cape May	36 min
May 19, 8:41 PM EDT	Areal Flood Warning	PHI	Kent	21 hr

Nearby

Dense Fog Advisories in New Jersey, 2018 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.