Alert archive / New Jersey / Areal Flood Warnings in 2023

Areal Flood Warning 42, NWS Philadelphia/Mount Holly

December 10, 2023Hunterdon County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood warning at Dec 10, 2023, 9:24 PM EST for Hunterdon County, New Jersey. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 10, 2023, 9:24 PM EST (02:24 UTC)
Expired: Dec 11, 2023, 9:00 AM EST
In force: 12 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Hunterdon County, NJ

The radar

The Philadelphia radar (KDIX), 81 km from the middle of the area, began a volume at 02:26 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, 2.4 hours before the alert went out and 176 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: 596 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 350 m²/s²
0-3 km storm-relative helicity: 370 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 warning 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 warning went out at Dec 10, 4:06 PM EST, 5 hours 18 minutes earlier.

Area forecast discussion, Dec 10, 4:06 PM EST, 5 hours 18 minutes before

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Hazardous weather outlook, Dec 10, 4:44 PM EST, 4 hours 40 minutes before

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In the hours before

Special weather statement, Dec 10, 6:30 PM EST, 2 hours 54 minutes before

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Local storm report, Dec 10, 7:58 PM EST, 1 hour 26 minutes before

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Local storm report, Dec 10, 7:59 PM EST, 1 hour 25 minutes before

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Local storm report, Dec 10, 8:14 PM EST, 1 hour 10 minutes before

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
814 PM EST Sun Dec 10 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0806 PM     Flood            1 ENE Tinicum Twp       39.88N 75.27W
12/10/2023                   Delaware           PA   Dept of Highways

            Flooding on I-95 S near Philadelphia
            International Airport. There is a lane
            restriction. Time given in report.

&&

Hoeflich

Local storm report, Dec 10, 8:15 PM EST, 1 hour 9 minutes before

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
815 PM EST Sun Dec 10 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0810 PM     Flood            1 SW King of Prussia    40.08N 75.39W
12/10/2023                   Montgomery         PA   Dept of Highways

            Flooding on I-76 near Route 202 in King of
            Prussia. There is a lane restriction. Time
            given in report.

&&

Hoeflich

Local storm report, Dec 10, 8:43 PM EST, 41 minutes before

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
843 PM EST Sun Dec 10 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0819 PM     Flood            1 NNE Belmont           39.98N 75.20W
12/10/2023                   Philadelphia       PA   Dept of Highways

            Flooding on I-76 near exit 339. There is a
            lane restriction. Time given in report.

&&

Hoeflich

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 10, 7:08 PM EST	Areal Flood Advisory	PHI	Gloucester, Salem	4 hr
Dec 10, 7:27 PM EST	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	8 hr
Dec 10, 9:42 PM EST	Areal Flood Warning	PHI	Monmouth, Ocean	4 hr
Dec 11, 3:28 AM EST	Areal Flood Warning	PHI	Somerset	11 hr
Dec 11, 4:36 AM EST	Areal Flood Warning	PHI	Somerset	5 hr
Dec 11, 2:33 PM EST	Small Craft Advisory	PHI		40 hr
Dec 10, 11:04 PM EST	Areal Flood Warning	PHI	Chester, Delaware	6 hr
Dec 10, 11:36 PM EST	Areal Flood Warning	PHI	Montgomery	9 hr
Dec 10, 11:42 PM EST	Areal Flood Warning	PHI	Montgomery	4 hr
Dec 11, 12:44 AM EST	Areal Flood Warning	PHI	Bucks	9 hr
Dec 11, 1:19 AM EST	Areal Flood Warning	PHI	Montgomery, Philadelphia	8 hr
Dec 11, 1:34 AM EST	Areal Flood Warning	PHI	Berks	7 hr
Dec 11, 2:43 AM EST	River Flood Warning	PHI	Bucks	10 hr
Dec 11, 3:02 AM EST	River Flood Warning	PHI	Chester	4 hr
Dec 11, 4:26 AM EST	Areal Flood Warning	PHI	Lehigh	6 hr
Dec 10, 10:21 PM EST	River Flood Warning	PHI	New Castle	6 hr

Nearby

Areal Flood Warnings in New Jersey, 2023 Every areal flood warning in 2023

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.