Alert archive / New Jersey / Winter Weather Advisories in 2022

Winter Weather Advisory 20, NWS Philadelphia/Mount Holly

December 23, 202216 counties in New Jersey; 10 counties in Pennsylvania; Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this winter weather advisory at Dec 23, 2022, 9:09 AM EST for 16 counties in New Jersey; 10 counties in Pennsylvania; Kent County, New Castle County, Sussex County, Delaware. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Dec 23, 2022, 9:09 AM EST (14:09 UTC)
Expired: Dec 23, 2022, 6:00 PM EST
In force: 9 hr
Issued by: NWS Philadelphia/Mount Holly

All 29 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, 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), 59 km from the middle of the area, began a volume at 14:12 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, 2.2 hours before the alert went out and 205 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: 51 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 491 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 594 m²/s²
0-3 km storm-relative helicity: 547 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather 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 winter weather advisory went out at Dec 23, 4:14 AM EST, 4 hours 55 minutes earlier.

Area forecast discussion, Dec 23, 4:14 AM EST, 4 hours 55 minutes before

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Hazardous weather outlook, Dec 23, 8:04 AM EST, 1 hour 5 minutes before

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In the hours before

Local storm report, Dec 23, 8:29 AM EST, 40 minutes before

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Local storm report, Dec 23, 8:35 AM EST, 34 minutes before

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Local storm report, Dec 23, 8:45 AM EST, 24 minutes before

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Local storm report, Dec 23, 8:48 AM EST, 21 minutes before

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Local storm report, Dec 23, 9:01 AM EST, 8 minutes before

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Local storm report, Dec 23, 9:05 AM EST, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
905 AM EST FRI DEC 23 2022

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

0902 AM     COASTAL FLOOD    1 ENE BAYVILLE          39.91N 74.14W
12/23/2022                   OCEAN              NJ   TRAINED SPOTTER

            MULTIPLE ROAD CLOSURES REPORTED ON THE
            BAYSIDE ROADWAYS OF BAYVILLE NJ.

&&

DESILVA

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 23, 10:55 AM EST	Special Marine Warning	PHI		65 min
Dec 23, 11:06 AM EST	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cape May, Mercer	39 min
Dec 23, 11:44 AM EST	Special Marine Warning	PHI		61 min
Dec 23, 12:17 PM EST	Coastal Flood Warning	PHI	Ocean	9 hr
Dec 23, 1:28 PM EST	Storm Warning	PHI		7 hr
Dec 23, 3:21 PM EST	Heavy Freezing Spray Advisory	PHI		39 hr
Dec 23, 3:32 PM EST	Wind Chill Warning	PHI	Carbon, Monroe	21 hr

Nearby

Winter Weather Advisories in New Jersey, 2022 Winter Weather Advisories in Pennsylvania, 2022 Winter Weather Advisories in Delaware, 2022 Every winter weather advisory in 2022

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.