Alert archive / New Jersey / Dense Fog Advisories in 2013

Dense Fog Advisory 4, NWS Philadelphia/Mount Holly

January 30, 201313 counties in New Jersey; 10 counties in Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this dense fog advisory at Jan 30, 2013, 4:02 AM EST for 13 counties in New Jersey; 10 counties in Pennsylvania; New Castle County, Delaware. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jan 30, 2013, 4:02 AM EST (09:02 UTC)
Expired: Jan 30, 2013, 11:32 AM EST
In force: 8 hr
Issued by: NWS Philadelphia/Mount Holly

All 24 counties

New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 70 km from the middle of the area, began a volume at 09:08 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 00:00Z, 9.0 hours before the alert went out and 196 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 184 m²/s²
0-3 km storm-relative helicity: 291 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 Jan 30, 3:45 AM EST, 17 minutes earlier.

Area forecast discussion, Jan 30, 3:45 AM EST, 17 minutes before

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Hazardous weather outlook, Jan 29, 4:06 PM EST, 11 hours 56 minutes before

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In the hours before

Special weather statement, Jan 30, 2:41 AM EST, 1 hour 21 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
Jan 30, 4:02 AM EST	High Wind Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 4 more	26 hr
Jan 30, 4:02 AM EST	Wind Advisory	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more	24 hr
Jan 30, 4:12 AM EST	Gale Warning	PHI		47 hr
Jan 30, 3:04 PM EST	Special Weather Statement	PHI	Sussex, Warren	56 min
Jan 30, 3:33 PM EST	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	117 min
Jan 30, 4:14 PM EST	Special Weather Statement	PHI	Sussex, Warren	61 min
Jan 30, 5:00 PM EST	Special Weather Statement	PHI	Burlington, Camden, Gloucester, Salem	2 hr
Jan 30, 1:50 PM EST	Special Weather Statement	PHI	Berks, Lehigh	115 min
Jan 30, 2:41 PM EST	Special Weather Statement	PHI	Chester, Delaware	64 min

Nearby

Dense Fog Advisories in New Jersey, 2013 Dense Fog Advisories in Pennsylvania, 2013 Dense Fog Advisories in Delaware, 2013 Every dense fog advisory in 2013

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.