Alert archive / Pennsylvania / Areal Flood Advisories in 2008

Areal Flood Advisory 42, NWS Philadelphia/Mount Holly

December 12, 20084 counties in New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Dec 12, 2008, 8:34 AM EST for 4 counties in New Jersey; 5 counties in Pennsylvania. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Dec 12, 2008, 8:34 AM EST (13:34 UTC)
Expired: Dec 12, 2008, 11:30 AM EST
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Morris County, NJ, Sussex County, NJ, Warren County, NJ, Bucks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 112 km from the middle of the area, began a volume at 13:36 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, 1.6 hours before the alert went out and 191 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: 512 m above ground
0-6 km bulk shear: 102 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 208 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 Dec 12, 3:51 AM EST, 4 hours 43 minutes earlier.

Area forecast discussion, Dec 12, 3:51 AM EST, 4 hours 43 minutes before

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Hazardous weather outlook, Dec 12, 3:16 AM EST, 5 hours 18 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
Dec 11, 7:46 PM EST	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	9 hr
Dec 11, 9:00 PM EST	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	13 hr
Dec 11, 9:10 PM EST	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	3 hr
Dec 11, 9:32 PM EST	Areal Flood Warning	PHI	Burlington, Camden, Gloucester, Mercer	12 hr
Dec 11, 10:05 PM EST	Areal Flood Warning	PHI	Burlington, Camden, Gloucester	11 hr
Dec 11, 10:41 PM EST	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	6 hr
Dec 11, 10:59 PM EST	Special Marine Warning	PHI		2 hr
Dec 11, 11:20 PM EST	Areal Flood Warning	PHI	Hunterdon, Somerset	14 hr
Dec 11, 11:49 PM EST	Areal Flood Warning	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	14 hr
Dec 12, 12:53 AM EST	Special Marine Warning	PHI		112 min
Dec 12, 2:48 AM EST	Areal Flood Advisory	PHI	Sussex, Warren	6 hr
Dec 12, 5:42 AM EST	River Flood Warning	PHI	Somerset	36 hr
Dec 12, 9:00 AM EST	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	6 hr
Dec 12, 9:07 AM EST	River Flood Warning	PHI	Middlesex, Somerset	20 hr
Dec 12, 9:40 AM EST	River Flood Warning	PHI	Essex, Morris, Passaic	4 days
Dec 12, 9:40 AM EST	River Flood Warning	PHI	Morris, Passaic	19 hr
Dec 12, 9:40 AM EST	River Flood Warning	PHI	Burlington	30 hr
Dec 12, 9:40 AM EST	River Flood Warning	PHI	Somerset	6 hr
Dec 12, 9:40 AM EST	River Flood Warning	PHI	Morris	20 hr
Dec 12, 9:40 AM EST	River Flood Warning	PHI	Morris	34 hr
Dec 12, 9:50 AM EST	River Flood Warning	PHI	Middlesex, Somerset	19 hr
Dec 12, 1:13 PM EST	Areal Flood Warning	PHI	Somerset	28 hr
Dec 12, 1:44 PM EST	Areal Flood Warning	PHI	Monmouth, Ocean	6 hr
Dec 11, 9:47 PM EST	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	6 hr
Dec 12, 12:55 AM EST	Areal Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	12 hr
Dec 12, 2:12 AM EST	River Flood Warning	PHI	Berks, Schuylkill	13 hr
Dec 12, 2:41 AM EST	River Flood Warning	PHI	Montgomery	10 hr
Dec 12, 3:46 AM EST	River Flood Warning	PHI	Chester	10 hr
Dec 12, 7:45 AM EST	River Flood Warning	PHI	Bucks	7 hr
Dec 12, 9:02 AM EST	River Flood Warning	PHI	Montgomery, Philadelphia	6 hr
Dec 12, 11:17 AM EST	River Flood Warning	PHI	Chester, Delaware	9 hr

Nearby

Areal Flood Advisories in Pennsylvania, 2008 Areal Flood Advisories in New Jersey, 2008 Every areal flood advisory in 2008

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.