Alert archive / New Jersey / Areal Flood Advisories in 2018

Areal Flood Advisory 203, NWS Philadelphia/Mount Holly

August 6, 2018Camden County, Gloucester County, New Jersey; Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 6, 2018, 2:42 PM EDT for Camden County, Gloucester County, New Jersey; Delaware County, Philadelphia County, Pennsylvania. It was in force for 36 min.

The area

The counties it named.

The facts

Issued: Aug 6, 2018, 2:42 PM EDT (18:42 UTC)
Expired: Aug 6, 2018, 3:18 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Camden County, NJ, Gloucester County, NJ, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 18:44 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.7 hours before the alert went out and 216 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1988 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 930 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 44 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 Aug 5, 6:14 PM EDT, 20 hours 28 minutes earlier.

Area forecast discussion, Aug 5, 6:14 PM EDT, 20 hours 28 minutes before

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Hazardous weather outlook, Aug 5, 3:26 PM EDT, 23 hours 16 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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        Please try again in a few minutes.
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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
Aug 6, 3:07 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden	48 min
Aug 6, 3:35 PM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	21 min

Nearby

Areal Flood Advisories in New Jersey, 2018 Areal Flood Advisories in Pennsylvania, 2018 Every 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.