Alert archive / New Jersey / Coastal Flood Advisories in 2018

Coastal Flood Advisory 24, NWS Philadelphia/Mount Holly

August 12, 201811 counties in New Jersey; Bucks County, Delaware County, Philadelphia County, Pennsylvania; Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this coastal flood advisory at Aug 12, 2018, 5:28 AM EDT for 11 counties in New Jersey; Bucks County, Delaware County, Philadelphia County, Pennsylvania; Kent County, New Castle County, Sussex County, Delaware. It took effect at Aug 12, 2018, 8:00 PM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Aug 12, 2018, 5:28 AM EDT (09:28 UTC)
In effect from: Aug 12, 2018, 8:00 PM EDT
Expired: Aug 13, 2018, 5:00 AM EDT
In force: 9 hr
Issued by: NWS Philadelphia/Mount Holly

Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem County, NJ, Bucks County, PA, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 09:30 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 9.5 hours before the alert went out and 203 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: 2834 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 636 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this coastal 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 coastal flood advisory went out at Aug 12, 3:32 AM EDT, 1 hour 56 minutes earlier.

Area forecast discussion, Aug 12, 3:32 AM EDT, 1 hour 56 minutes before

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Hazardous weather outlook, Aug 12, 3:40 AM EDT, 1 hour 48 minutes before

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In the hours before

Local storm report, Aug 12, 1:24 AM EDT, 4 hours 4 minutes before

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Local storm report, Aug 12, 2:39 AM EDT, 2 hours 49 minutes before

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Local storm report, Aug 12, 3:38 AM EDT, 1 hour 50 minutes before

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Local storm report, Aug 12, 4:28 AM EDT, 1 hour before

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Local storm report, Aug 12, 4:41 AM EDT, 47 minutes before

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Special weather statement, Aug 12, 5:24 AM EDT, 4 minutes before

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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 11, 8:02 PM EDT	Special Marine Warning	PHI		58 min
Aug 11, 8:48 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May	3 hr
Aug 11, 8:57 PM EDT	Special Marine Warning	PHI		63 min
Aug 11, 9:08 PM EDT	Special Marine Warning	PHI		67 min
Aug 11, 9:11 PM EDT	Areal Flood Advisory	PHI	Cumberland, Salem	81 min
Aug 11, 9:30 PM EDT	Areal Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	88 min
Aug 11, 9:57 PM EDT	Special Marine Warning	PHI		63 min
Aug 11, 10:28 PM EDT	Areal Flood Warning	PHI	Warren	4 hr
Aug 11, 11:04 PM EDT	Special Marine Warning	PHI		56 min
Aug 11, 11:58 PM EDT	Special Marine Warning	PHI		37 min
Aug 12, 6:17 PM EDT	Areal Flood Advisory	PHI	Cumberland, Salem	118 min
Aug 12, 6:32 PM EDT	Flash Flood Warning	PHI	Cumberland, Salem	112 min
Aug 12, 7:53 PM EDT	Special Marine Warning	PHI		32 min
Aug 11, 8:57 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr

Nearby

Coastal Flood Advisories in New Jersey, 2018 Coastal Flood Advisories in Pennsylvania, 2018 Coastal Flood Advisories in Delaware, 2018 Every coastal 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.