Alert archive / New Jersey / Areal Flood Advisories in 2018

Areal Flood Advisory 306, NWS Philadelphia/Mount Holly

September 25, 20187 counties in New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Sep 25, 2018, 4:03 PM EDT for 7 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Sep 25, 2018, 4:03 PM EDT (20:03 UTC)
Expired
Sep 25, 2018, 7:00 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 51 km from the middle of the area, began a volume at 20:03 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

Brookhaven, NY (KOKX), launched 12:00Z, 8.1 hours before the alert went out and 193 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, Brookhaven, NY at 12:00Z on 2018-09-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 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, Brookhaven, NY at 12:00Z on 2018-09-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 413 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
457 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
413 m²/s²
0-3 km storm-relative helicity
577 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 areal flood 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 areal flood advisory went out at Sep 25, 3:48 PM EDT, 15 minutes earlier.

Area forecast discussion, Sep 25, 3:48 PM EDT, 15 minutes before
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Hazardous weather outlook, Sep 25, 3:49 PM EDT, 14 minutes before
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</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.
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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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In the hours before

Special weather statement, Sep 25, 12:07 PM EDT, 3 hours 56 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
1207 PM EDT TUE SEP 25 2018

NJZ001-007>010-012-015-PAZ055-062-105-106-251630-
Morris-Hunterdon-Sussex-Somerset-Middlesex-Warren-Mercer-Lower
Bucks-Upper Bucks-Monroe-Northampton-
1207 PM EDT TUE SEP 25 2018

...A LINE OF SHOWERS WILL AFFECT MORRIS...HUNTERDON...SUSSEX...
WARREN...NORTHWESTERN MERCER...SOMERSET...NORTH CENTRAL MIDDLESEX...
CENTRAL BUCKS...EAST CENTRAL MONROE AND EASTERN NORTHAMPTON
COUNTIES...

At 1206 PM EDT, radar indicated showers were located along a line
extending from near Port Jervis to Chester to Hopewell. Movement was
northeast at 25 mph.

Moderate to heavy rainfall is occurring with these showers, and may
cause ponding on roadways and poor drainage areas.

Locations impacted include...
Easton, Morristown, Somerville, Newton, Montague, Bridgewater, Dover,
Madison, Hopatcong, Middlesex, Florham Park, East Hanover, Lincoln
Park, Bound Brook, Manville, Kinnelon, Hackettstown, Chatham, Byram
and Boonton.

LAT...LON 4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4090 7427 4091 7433
      4075 7436 4067 7446 4066 7440 4060 7446
      4060 7437 4021 7499 4058 7524 4115 7513
      4109 7500 4116 7490 4128 7484 4136 7469
TIME...MOT...LOC 1606Z 225DEG 21KT 4141 7464 4077 7471 4040 7480

Robertson
Special weather statement, Sep 25, 12:47 PM EDT, 3 hours 16 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
1247 PM EDT TUE SEP 25 2018

NJZ001-007>010-012-015-251730-
Morris-Hunterdon-Sussex-Somerset-Middlesex-Warren-Mercer-
1247 PM EDT TUE SEP 25 2018

...A LINE OF SHOWERS WILL AFFECT MORRIS...EASTERN HUNTERDON...
SUSSEX...NORTHEASTERN WARREN...NORTHWESTERN MERCER...SOMERSET AND
NORTHERN MIDDLESEX COUNTIES...

At 1247 PM EDT, radar indicated showers were located along a line
extending from High Point to near Bridgewater to New Hope. Movement
was northeast at 25 mph.

Moderate to heavy rainfall is occurring with these showers, and may
cause ponding on roadways and poor drainage areas.

Locations impacted include...
New Brunswick, Perth Amboy, Morristown, Somerville, Port Jervis,
Newton, Montague, Somerset, Edison, East Brunswick, Bridgewater,
Sayreville, North Brunswick, Carteret, Dover, Madison, Hopatcong,
Middlesex, Florham Park and East Hanover.

LAT...LON 4120 7437 4110 7449 4104 7450 4105 7445
      4102 7443 4097 7428 4090 7427 4091 7433
      4075 7436 4067 7446 4065 7440 4060 7446
      4059 7420 4048 7427 4031 7491 4034 7494
      4064 7481 4125 7486 4135 7475 4136 7469
TIME...MOT...LOC 1647Z 244DEG 15KT 4132 7469 4064 7463 4034 7494

Robertson

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 25, 12:07 PM EDTSpecial Weather StatementPHIHunterdon, Morris, Somerset, Sussex, Warren23 min
Sep 25, 12:33 PM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean8 hr
Sep 25, 12:47 PM EDTSpecial Weather StatementPHIMorris, Somerset, Sussex43 min
Sep 25, 2:30 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset3 hr
Sep 25, 4:19 PM EDTFlash Flood WarningPHICamden4 hr
Sep 25, 5:14 PM EDTFlash Flood WarningPHIMercer, Middlesex, Somerset4 hr
Sep 25, 5:35 PM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester, Mercer4 hr
Sep 25, 6:03 PM EDTFlash Flood WarningPHIMercer, Middlesex, Monmouth3 hr
Sep 25, 6:39 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Gloucester, Ocean3 hr
Sep 25, 6:47 PM EDTTornado WarningPHIBurlington32 min
Sep 25, 7:21 PM EDTSevere Thunderstorm WarningPHIMonmouth17 min
Sep 25, 2:59 PM EDTAreal Flood AdvisoryPHIBucks, Chester, Delaware, Lehigh, Montgomery4 hr

Nearby

Areal Flood Advisories in New Jersey, 2018Areal Flood Advisories in Pennsylvania, 2018Every areal flood 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.