Alert archive / New Jersey / Dense Fog Advisories in 2019

Dense Fog Advisory 7, NWS Philadelphia/Mount Holly

May 30, 2019Burlington County, Mercer County, New Jersey; Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this dense fog advisory at May 30, 2019, 3:33 AM EDT for Burlington County, Mercer County, New Jersey; Bucks County, Montgomery County, Pennsylvania. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
May 30, 2019, 3:33 AM EDT (07:33 UTC)
Expired
May 30, 2019, 8:00 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly

Counties Burlington County, NJ, Mercer County, NJ, Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 07:35 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 7.6 hours before the alert went out and 250 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2019-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 24 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2019-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
24 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
2113 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
54 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 30, 3:18 AM EDT, 15 minutes earlier.

Area forecast discussion, May 30, 3:18 AM EDT, 15 minutes before
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Hazardous weather outlook, May 29, 9:17 PM EDT, 6 hours 16 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
917 PM EDT Wed May 29 2019

DEZ001>003-MDZ008-012-015-019-020-NJZ001-007>010-012-013-015>023-027-
PAZ054-055-060>062-070-071-101>106-310130-
New Castle-Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot-
Caroline-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-
Western Monmouth-Mercer-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-
Southeastern Burlington-Carbon-Monroe-Berks-Lehigh-Northampton-
Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
917 PM EDT Wed May 29 2019

This Hazardous Weather Outlook is for central Delaware, northern
Delaware, southern Delaware, northeast Maryland, central New
Jersey, northern New Jersey, northwest New Jersey, southern New
Jersey, east central Pennsylvania, northeast Pennsylvania and
southeast Pennsylvania.

.DAY ONE...Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Another round of thunderstorms with heavy rain is possible
Thursday afternoon into Thursday evening which could lead to
additional flooding concerns. There is also a risk for severe
weather Thursday afternoon into Thursday evening.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ004-NJZ014-024>026-310130-
Delaware Beaches-Eastern Monmouth-Atlantic Coastal Cape May-
Coastal Atlantic-Coastal Ocean-
917 PM EDT Wed May 29 2019

This Hazardous Weather Outlook is for southern Delaware, central
New Jersey and southern New Jersey.

.DAY ONE...Tonight.

There is a low probability for widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Another round of thunderstorms with heavy rain is possible
Thursday afternoon into Thursday evening which could lead to
additional flooding concerns. There is also a risk for severe
weather Thursday afternoon into Thursday evening.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ430-431-450>455-310130-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
917 PM EDT Wed May 29 2019

This Hazardous Weather Outlook is for Atlantic coastal waters and
Delaware Bay Waters.

.DAY ONE...Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

In the hours before

Local storm report, May 29, 9:44 PM EDT, 5 hours 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
944 PM EDT WED MAY 29 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 PM     FLASH FLOOD      1 WNW BRISTOL           40.10N 74.87W
05/29/2019                   BUCKS              PA   TRAINED SPOTTER

            SEVERAL REPORTS OF WATER RESCUES FROM THE
            AREAS OF BRISTOL, BENSALEM, AND MIDDLETOWN
            TOWNSHIP.

&&

SFJ
Local storm report, May 29, 10:13 PM EDT, 5 hours 20 minutes before
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Local storm report, May 29, 10:57 PM EDT, 4 hours 36 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 29, 8:00 PM EDTSpecial Marine WarningPHI60 min
May 29, 8:02 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Ocean107 min
May 29, 8:35 PM EDTSpecial Marine WarningPHI85 min
May 30, 3:20 AM EDTFlash Flood WatchPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more18 hr
May 30, 4:17 PM EDTAreal Flood AdvisoryPHISussex, Warren4 hr
May 30, 4:19 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester4 hr
May 30, 4:25 PM EDTSpecial Weather StatementPHIWarren35 min
May 30, 4:36 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Monmouth, Ocean39 min
May 30, 4:40 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Warren50 min
May 30, 4:46 PM EDTSpecial Weather StatementPHISalem29 min
May 30, 4:48 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren42 min
May 30, 4:49 PM EDTFlash Flood WarningPHIWarren4 hr
May 30, 4:57 PM EDTAreal Flood AdvisoryPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more4 hr
May 30, 4:58 PM EDTSpecial Marine WarningPHI62 min
May 30, 5:03 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset, Warren4 hr
May 30, 5:14 PM EDTSpecial Weather StatementPHISalem31 min
May 30, 5:17 PM EDTFlash Flood WarningPHIBurlington, Camden, Mercer, Monmouth4 hr
May 30, 5:20 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset, Warren40 min
May 30, 5:22 PM EDTAreal Flood AdvisoryPHICape May, Cumberland, Gloucester, Salem2 hr
May 30, 5:23 PM EDTSpecial Weather StatementPHIMercer37 min
May 30, 5:32 PM EDTSevere Thunderstorm WarningPHICape May43 min
May 30, 5:33 PM EDTSpecial Marine WarningPHI27 min
May 30, 5:55 PM EDTSpecial Marine WarningPHI65 min
May 30, 5:55 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset31 min
May 30, 6:06 PM EDTFlash Flood WarningPHIHunterdon, Middlesex, Morris, Somerset4 hr
May 30, 6:53 PM EDTFlash Flood WarningPHIMorris, Somerset4 hr
May 30, 7:35 PM EDTSpecial Weather StatementPHIMercer25 min
May 30, 7:56 PM EDTSpecial Weather StatementPHIMercer34 min
May 29, 8:16 PM EDTRiver Flood WarningPHIBucks11 hr
May 29, 9:57 PM EDTAreal Flood WarningPHILehigh2 hr
May 30, 4:03 PM EDTSpecial Weather StatementPHIBerks27 min
May 30, 4:22 PM EDTSpecial Weather StatementPHIDelaware23 min
May 30, 5:02 PM EDTSpecial Weather StatementPHIPhiladelphia28 min
May 30, 6:51 PM EDTSpecial Weather StatementPHIBerks24 min
May 29, 8:10 PM EDTSpecial Weather StatementPHISussex35 min
May 29, 8:49 PM EDTSpecial Weather StatementPHISussex26 min
May 30, 4:08 PM EDTAreal Flood AdvisoryPHIKent, New Castle2 hr
May 30, 4:09 PM EDTSpecial Weather StatementPHINew Castle36 min
May 30, 4:32 PM EDTSevere Thunderstorm WarningPHIKent, Sussex43 min
May 30, 5:09 PM EDTSevere Thunderstorm WarningPHIKent, Sussex51 min

Nearby

Dense Fog Advisories in New Jersey, 2019Dense Fog Advisories in Pennsylvania, 2019Every dense fog advisory in 2019

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.